Update MSSMoovProcessor.cs

see also https://github.com/google/ExoPlayer/issues/9727

.github/workflows/build_latest.yml

@@ -10,7 +10,7 @@ on:
         required: false
       tag:
         type: string
-        description: 'Release version tag (e.g. v1.2.3)'
+        description: 'Release version tag (e.g. v0.2.1-beta)'
         required: true
       ref:
         type: string
@@ -19,16 +19,73 @@ on:
         default: 'main'
 
 env:
-  DOTNET_SDK_VERSION: "8.0.*"
+  DOTNET_SDK_VERSION: "9.0.*"
   ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: true
 
 jobs:
-  build-win-x64-arm64:
+  set-date:
+    runs-on: ubuntu-latest
+    outputs:
+      date: ${{ steps.get_date.outputs.date }}
+      tag: ${{ steps.format_tag.outputs.tag }}
+    steps:
+      - name: Get Date in UTC+8
+        id: get_date
+        run: |
+          DATE=$(date -u -d '8 hours' +'%Y%m%d')
+          echo "date=${DATE}" >> "$GITHUB_OUTPUT"
+
+      - name: Determine Tag
+        id: format_tag
+        run: |
+          if [ "${{ github.event.inputs.doRelease }}" == "true" ]; then
+            TAG="${{ github.event.inputs.tag }}"
+          else
+            TAG="actions-$GITHUB_RUN_ID"
+          fi
+          echo "tag=${TAG}" >> "$GITHUB_OUTPUT"
+
+  build-win-nt6_0-x86:
     runs-on: windows-latest
+    needs: set-date
 
     steps:
       - uses: actions/checkout@v1
 
+      - name: Install zip
+        run: choco install zip --no-progress --yes
+
+      - name: Set up dotnet
+        uses: actions/setup-dotnet@v3
+        with:
+          dotnet-version: ${{ env.DOTNET_SDK_VERSION }}
+
+      - run: powershell -Command "(Get-Content src/N_m3u8DL-RE/N_m3u8DL-RE.csproj) -replace '<TargetFramework>.*</TargetFramework>', '<TargetFramework>net9.0-windows</TargetFramework>' | Set-Content src/N_m3u8DL-RE/N_m3u8DL-RE.csproj"
+      - run: dotnet add src/N_m3u8DL-RE/N_m3u8DL-RE.csproj package YY-Thunks --version 1.1.4
+      - run: dotnet add src/N_m3u8DL-RE/N_m3u8DL-RE.csproj package VC-LTL --version 5.1.1
+      - run: dotnet publish src/N_m3u8DL-RE -p:TargetPlatformMinVersion=6.0 -r win-x86 -c Release -o artifact-x86
+
+      - name: Package [win-x86]
+        run: |
+          cd artifact-x86
+          zip ../N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_win-NT6.0-x86_${{ needs.set-date.outputs.date }}.zip N_m3u8DL-RE.exe
+
+      - name: Upload Artifact[win-x86]
+        uses: actions/upload-artifact@v3.1.3
+        with:
+          name: win-NT6.0-x86
+          path: N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_win-NT6.0-x86_${{ needs.set-date.outputs.date }}.zip
+
+  build-win-x64-arm64:
+    runs-on: windows-latest
+    needs: set-date
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Install zip
+        run: choco install zip --no-progress --yes
+
       - name: Set up dotnet
         uses: actions/setup-dotnet@v3
         with:
@@ -37,59 +94,169 @@ jobs:
       - run: dotnet publish src/N_m3u8DL-RE -r win-x64 -c Release -o artifact-x64
       - run: dotnet publish src/N_m3u8DL-RE -r win-arm64 -c Release -o artifact-arm64
 
-      - name: Upload Artifact[win-x64]
+      - name: Package [win]
+        run: |
+          cd artifact-x64
+          zip ../N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_win-x64_${{ needs.set-date.outputs.date }}.zip N_m3u8DL-RE.exe
+          cd ../artifact-arm64
+          zip ../N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_win-arm64_${{ needs.set-date.outputs.date }}.zip N_m3u8DL-RE.exe
+
+      - name: Upload Artifact [win-x64]
         uses: actions/upload-artifact@v3.1.3
         with:
-          name: N_m3u8DL-RE_Beta_win-x64
+          name: win-x64
-          path: artifact-x64\N_m3u8DL-RE.exe
+          path: N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_win-x64_${{ needs.set-date.outputs.date }}.zip
 
-      - name: Upload Artifact[win-arm64]
+      - name: Upload Artifact [win-arm64]
         uses: actions/upload-artifact@v3.1.3
         with:
-          name: N_m3u8DL-RE_Beta_win-arm64
+          name: win-arm64
-          path: artifact-arm64\N_m3u8DL-RE.exe
+          path: N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_win-arm64_${{ needs.set-date.outputs.date }}.zip
 
-  build-linux-x64:
+  build-linux-x64-arm64:
     runs-on: ubuntu-latest
-    container: ubuntu:18.04
+    needs: set-date
 
     steps:
-      - run: apt-get update
+      # https://learn.microsoft.com/zh-cn/dotnet/core/deploying/native-aot/cross-compile
-      - run: apt-get install -y curl wget
+      - run: |
+          sudo dpkg --add-architecture arm64
+          sudo bash -c 'cat > /etc/apt/sources.list.d/arm64.list <<EOF
+          deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports/ jammy main restricted
+          deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports/ jammy-updates main restricted
+          deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports/ jammy-backports main restricted universe multiverse
+          EOF'
+          sudo sed -i -e 's/deb http/deb [arch=amd64] http/g' /etc/apt/sources.list
+          sudo sed -i -e 's/deb mirror/deb [arch=amd64] mirror/g' /etc/apt/sources.list
+          sudo apt-get update
+          sudo apt-get install -y curl wget libicu-dev libcurl4-openssl-dev zlib1g-dev libkrb5-dev clang llvm binutils-aarch64-linux-gnu gcc-aarch64-linux-gnu zlib1g-dev:arm64
+      
       - uses: actions/checkout@v1
       - name: Set up dotnet
         uses: actions/setup-dotnet@v3
         with:
           dotnet-version: ${{ env.DOTNET_SDK_VERSION }}
-      - run: apt-get install -y libicu-dev libcurl4-openssl-dev zlib1g-dev libkrb5-dev
+      
       - run: dotnet publish src/N_m3u8DL-RE -r linux-x64 -c Release -o artifact
+      - run: dotnet publish src/N_m3u8DL-RE -r linux-arm64 -c Release -o artifact-arm64
 
-      - name: Upload Artifact[linux-x64]
+      - name: Package [linux]
+        run: |
+          cd artifact
+          tar -czvf ../N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_linux-x64_${{ needs.set-date.outputs.date }}.tar.gz N_m3u8DL-RE
+          cd ../artifact-arm64
+          tar -czvf ../N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_linux-arm64_${{ needs.set-date.outputs.date }}.tar.gz N_m3u8DL-RE
+
+      - name: Upload Artifact [linux-x64]
         uses: actions/upload-artifact@v3.1.3
         with:
-          name: N_m3u8DL-RE_Beta_linux-x64
+          name: linux-x64
-          path: artifact/N_m3u8DL-RE
+          path: N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_linux-x64_${{ needs.set-date.outputs.date }}.tar.gz
-
-  build-linux-arm64:
-    runs-on: ubuntu-latest
-    container: mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-18.04-cross-arm64-20220312201346-b2c2436
-
-    steps:
-      - uses: actions/checkout@v1
-      - name: Set up dotnet
-        uses: actions/setup-dotnet@v3
-        with:
-          dotnet-version: ${{ env.DOTNET_SDK_VERSION }}
-      - run: dotnet publish src/N_m3u8DL-RE -r linux-arm64 -c Release -p:StripSymbols=true -p:CppCompilerAndLinker=clang-9 -p:SysRoot=/crossrootfs/arm64 -o artifact
 
       - name: Upload Artifact[linux-arm64]
         uses: actions/upload-artifact@v3.1.3
         with:
-          name: N_m3u8DL-RE_Beta_linux-arm64
+          name: linux-arm64
-          path: artifact/N_m3u8DL-RE
+          path: N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_linux-arm64_${{ needs.set-date.outputs.date }}.tar.gz
+
+  build-android-bionic-x64-arm64:
+    runs-on: windows-latest
+    needs: set-date
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Set up NDK
+        shell: pwsh
+        run: |
+          Invoke-WebRequest -Uri "https://dl.google.com/android/repository/android-ndk-r27c-windows.zip" -OutFile "android-ndk.zip"
+          Expand-Archive -Path "android-ndk.zip" -DestinationPath "./android-ndk"
+          Get-ChildItem -Path "./android-ndk"
+          $ndkRoot = "${{ github.workspace }}\android-ndk\android-ndk-r27c"
+          echo "NDK_ROOT=$ndkRoot" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8
+          $ndkBinPath = "$ndkRoot\toolchains\llvm\prebuilt\windows-x86_64\bin"
+          echo $ndkBinPath | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8
+
+      - name: Set up dotnet
+        uses: actions/setup-dotnet@v3
+        with:
+          dotnet-version: ${{ env.DOTNET_SDK_VERSION }}
+      
+      - run: dotnet publish src/N_m3u8DL-RE -r linux-bionic-x64 -p:DisableUnsupportedError=true -p:PublishAotUsingRuntimePack=true -o artifact
+      - run: dotnet publish src/N_m3u8DL-RE -r linux-bionic-arm64 -p:DisableUnsupportedError=true -p:PublishAotUsingRuntimePack=true -o artifact-arm64
+
+      - name: Package [linux-bionic]
+        run: |
+          cd artifact
+          tar -czvf ../N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_android-bionic-x64_${{ needs.set-date.outputs.date }}.tar.gz N_m3u8DL-RE
+          cd ../artifact-arm64
+          tar -czvf ../N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_android-bionic-arm64_${{ needs.set-date.outputs.date }}.tar.gz N_m3u8DL-RE
+
+      - name: Upload Artifact [linux-bionic-x64]
+        uses: actions/upload-artifact@v3.1.3
+        with:
+          name: android-bionic-x64
+          path: N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_android-bionic-x64_${{ needs.set-date.outputs.date }}.tar.gz
+
+      - name: Upload Artifact[linux-bionic-arm64]
+        uses: actions/upload-artifact@v3.1.3
+        with:
+          name: android-bionic-arm64
+          path: N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_android-bionic-arm64_${{ needs.set-date.outputs.date }}.tar.gz
+
+  build-linux-musl-x64:
+    runs-on: ubuntu-latest
+    needs: set-date
+    container: mcr.microsoft.com/dotnet/sdk:9.0-alpine-amd64
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - run: apk add clang build-base zlib-dev
+      - run: dotnet publish src/N_m3u8DL-RE -r linux-musl-x64 -c Release -o artifact -p:InvariantGlobalization=true
+
+      - name: Package [linux-musl-x64]
+        run: |
+          cd artifact
+          tar -czvf ../N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_linux-musl-x64_${{ needs.set-date.outputs.date }}.tar.gz N_m3u8DL-RE
+
+      - name: Upload Artifact [linux-musl-x64]
+        uses: actions/upload-artifact@v3.1.3
+        with:
+          name: linux-musl-x64
+          path: N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_linux-musl-x64_${{ needs.set-date.outputs.date }}.tar.gz
+
+  build-linux-musl-arm64:
+    runs-on: ubuntu-latest
+    needs: set-date
+    container: mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-cross-arm64-alpine
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Set up dotnet
+        uses: actions/setup-dotnet@v3
+        with:
+          dotnet-version: ${{ env.DOTNET_SDK_VERSION }}
+
+      - run: apt-get update
+      - run: apt-get install -y build-essential clang binutils-aarch64-linux-gnu
+      - run: dotnet publish src/N_m3u8DL-RE -r linux-musl-arm64 -c Release -o artifact -p:CppCompilerAndLinker=clang -p:SysRoot=/crossrootfs/arm64 -p:InvariantGlobalization=true
+
+      - name: Package [linux-musl-arm64]
+        run: |
+          cd artifact
+          tar -czvf ../N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_linux-musl-arm64_${{ needs.set-date.outputs.date }}.tar.gz N_m3u8DL-RE
+
+      - name: Upload Artifact [linux-musl-arm64]
+        uses: actions/upload-artifact@v3.1.3
+        with:
+          name: linux-musl-arm64
+          path: N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_linux-musl-arm64_${{ needs.set-date.outputs.date }}.tar.gz
 
   build-mac-x64-arm64:
     runs-on: macos-latest
+    needs: set-date
 
     steps:
       - uses: actions/checkout@v1
@@ -101,83 +268,44 @@ jobs:
       - run: dotnet publish src/N_m3u8DL-RE -r osx-arm64 -c Release -o artifact-arm64 
       - run: dotnet publish src/N_m3u8DL-RE -r osx-x64 -c Release -o artifact-x64 
 
-      - name: Upload Artifact[osx-x64]
+      - name: Package [osx]
+        run: |
+          cd artifact-x64
+          tar -czvf ../N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_osx-x64_${{ needs.set-date.outputs.date }}.tar.gz N_m3u8DL-RE
+          cd ../artifact-arm64
+          tar -czvf ../N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_osx-arm64_${{ needs.set-date.outputs.date }}.tar.gz N_m3u8DL-RE
+
+      - name: Upload Artifact [osx-x64]
         uses: actions/upload-artifact@v3.1.3
         with:
-          name: N_m3u8DL-RE_Beta_osx-x64
+          name: osx-x64
-          path: artifact-x64/N_m3u8DL-RE
+          path: N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_osx-x64_${{ needs.set-date.outputs.date }}.tar.gz
+
       - name: Upload Artifact[osx-arm64]
         uses: actions/upload-artifact@v3.1.3
         with:
-          name: N_m3u8DL-RE_Beta_osx-arm64
+          name: osx-arm64
-          path: artifact-arm64/N_m3u8DL-RE
+          path: N_m3u8DL-RE_${{ needs.set-date.outputs.tag }}_osx-arm64_${{ needs.set-date.outputs.date }}.tar.gz
 
-  create_draft_release:
+  create_release:
-    name: Create Github draft release
+    name: Create release
-    if: ${{ github.event.inputs.doRelease == 'true' }}
-    needs: [build-win-x64-arm64,build-linux-x64,build-linux-arm64,build-mac-x64-arm64]
     runs-on: ubuntu-latest
-    steps:
+    permissions:
-      - name: Audit gh version
+      contents: write
-        run: gh --version
-
-      - name: Check for existing release
-        id: check_release
-        run: |
-          echo "::echo::on"
-          gh release view --repo '${{ github.repository }}' '${{ github.event.inputs.tag }}' \
-            && echo "already_exists=true" >> $GITHUB_ENV \
-            || echo "already_exists=false" >> $GITHUB_ENV
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Checkout repo
-        if: env.already_exists == 'false'
-        uses: actions/checkout@v3
-        with:
-          ref: '${{ github.event.inputs.ref }}'
-
-      - name: Create release
-        if: env.already_exists == 'false'
-        run: >
-          gh release create
-          '${{ github.event.inputs.tag }}'
-          --draft
-          --repo '${{ github.repository }}'
-          --title '${{ github.event.inputs.tag }}'
-          --target '${{ github.event.inputs.ref }}'
-          --generate-notes
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
-  attach_to_release:
-    name: Attach native executables to release
     if: ${{ github.event.inputs.doRelease == 'true' }}
-    needs: create_draft_release
+    needs: [set-date,build-win-nt6_0-x86,build-win-x64-arm64,build-linux-x64-arm64,build-android-bionic-x64-arm64,build-linux-musl-x64,build-linux-musl-arm64,build-mac-x64-arm64]
-    runs-on: ubuntu-latest
+    
     steps:
-      - name: Get current date
+      - name: Fetch artifacts
-        id: date
-        run: echo "date=$(date +'%Y%m%d')" >> $GITHUB_ENV
-        
-      - name: GH version
-        run: gh --version
-      
-      - name: Fetch executables
         uses: actions/download-artifact@v3
 
-      - name: Tar (linux, macOS)
+      - name: Create GitHub Release
-        run: for dir in *{osx,linux}*; do tar cvzfp "${dir}_${{ env.date }}.tar.gz" "$dir"; done
+        uses: ncipollo/release-action@v1
-        
+        with:
-      - name: Zip (windows)
+          tag: ${{ github.event.inputs.tag }}
-        run: for dir in *win*; do zip -r "${dir}_${{ env.date }}.zip" "$dir"; done
+          name: N_m3u8DL-RE_${{ github.event.inputs.tag }}
-
+          artifacts: "android-bionic-x64/*,android-bionic-arm64/*,linux-x64/*,linux-arm64/*,linux-musl-x64/*,linux-musl-arm64/*,osx-x64/*,osx-arm64/*,win-x64/*,win-arm64/*,win-NT6.0-x86/*"
-      - name: Upload
+          draft: false
-        run: |
+          allowUpdates: true
-          until gh release upload --clobber --repo ${{ github.repository }} ${{ github.event.inputs.tag }} *.zip *.tar.gz; do
+          generateReleaseNotes: true
-            echo "Attempt $((++attempts)) to upload release artifacts failed. Will retry in 20s"
+          discussionCategory: 'Announcements'
-            sleep 20
-          done
-        timeout-minutes: 10
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

README.md

@@ -25,7 +25,7 @@ yay -Syu n-m3u8dl-re-git
 # 命令行参数
 ```
 Description:
-  N_m3u8DL-RE (Beta version) 20240630
+  N_m3u8DL-RE (Beta version) 20241201
 
 Usage:
   N_m3u8DL-RE <input> [options]
@@ -40,6 +40,7 @@ Options:
   --base-url <base-url>                                   设置BaseURL
   --thread-count <number>                                 设置下载线程数 [default: 本机CPU线程数]
   --download-retry-count <number>                         每个分片下载异常时的重试次数 [default: 3]
+  --http-request-timeout <seconds>                        HTTP请求的超时时间(秒) [default: 100]
   --force-ansi-console                                    强制认定终端为支持ANSI且可交互的终端
   --no-ansi-color                                         去除ANSI颜色
   --auto-select                                           自动选择所有类型的最佳轨道 [default: False]
@@ -63,11 +64,12 @@ Options:
   --log-level <DEBUG|ERROR|INFO|OFF|WARN>                 设置日志级别 [default: INFO]
   --ui-language <en-US|zh-CN|zh-TW>                       设置UI语言
   --urlprocessor-args <urlprocessor-args>                 此字符串将直接传递给URL Processor
-  --key <key>                              设置解密密钥, 程序调用mp4decrpyt/shaka-packager进行解密. 格式:
+  --key <key>                                             设置解密密钥, 程序调用mp4decrpyt/shaka-packager/ffmpeg进行解密. 格式:
                                                           --key KID1:KEY1 --key KID2:KEY2
+                                                          对于KEY相同的情况可以直接输入 --key KEY
   --key-text-file <key-text-file>                         设置密钥文件,程序将从文件中按KID搜寻KEY以解密.(不建议使用特大文件)
+  --decryption-engine <FFMPEG|MP4DECRYPT|SHAKA_PACKAGER>  设置解密时使用的第三方程序 [default: MP4DECRYPT]
   --decryption-binary-path <PATH>                         MP4解密所用工具的全路径, 例如 C:\Tools\mp4decrypt.exe
-  --use-shaka-packager                     解密时使用shaka-packager替代mp4decrypt [default: False]
   --mp4-real-time-decryption                              实时解密MP4分片 [default: False]
   -R, --max-speed <SPEED>                                 设置限速，单位支持 Mbps 或 Kbps，如：15M 100K
   -M, --mux-after-done <OPTIONS>                          所有工作完成时尝试混流分离的音视频. 输入 "--morehelp mux-after-done" 以查看详细信息
@@ -94,6 +96,8 @@ Options:
   -da, --drop-audio <OPTIONS>                             通过正则表达式去除符合要求的音频流.
   -ds, --drop-subtitle <OPTIONS>                          通过正则表达式去除符合要求的字幕流.
   --ad-keyword <REG>                                      设置广告分片的URL关键字(正则表达式)
+  --disable-update-check                                  禁用版本更新检测 [default: False]
+  --allow-hls-multi-ext-map                               允许HLS中的多个#EXT-X-MAP(实验性) [default: False]
   --morehelp <OPTION>                                     查看某个选项的详细帮助信息
   --version                                               Show version information
   -?, -h, --help                                          Show help and usage information

src/N_m3u8DL-RE.Common/Entity/EncryptInfo.cs

@@ -1,14 +1,9 @@
 using N_m3u8DL_RE.Common.Enum;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Entity
+namespace N_m3u8DL_RE.Common.Entity;
+
+public class EncryptInfo
 {
-    public class EncryptInfo
-    {
     /// <summary>
     /// 加密方式，默认无加密
     /// </summary>
@@ -34,10 +29,6 @@ namespace N_m3u8DL_RE.Common.Entity
         {
             return m;
         }
-            else
-            {
         return EncryptMethod.UNKNOWN;
     }
-        }
-    }
 }

src/N_m3u8DL-RE.Common/Entity/MSSData.cs

@@ -1,13 +1,7 @@
-using System;
+namespace N_m3u8DL_RE.Common.Entity;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Entity
+public class MSSData
 {
-    public class MSSData
-    {
     public string FourCC { get; set; } = "";
     public string CodecPrivateData { get; set; } = "";
     public string Type { get; set; } = "";
@@ -21,5 +15,4 @@ namespace N_m3u8DL_RE.Common.Entity
     public bool IsProtection { get; set; } = false;
     public string ProtectionSystemID { get; set; } = "";
     public string ProtectionData { get; set; } = "";
-    }
 }

src/N_m3u8DL-RE.Common/Entity/MediaPart.cs

@@ -1,14 +1,7 @@
-using System;
+namespace N_m3u8DL_RE.Common.Entity;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Entity
+// 主要处理 EXT-X-DISCONTINUITY
+public class MediaPart
 {
-    //主要处理 EXT-X-DISCONTINUITY
+    public List<MediaSegment> MediaSegments { get; set; } = [];
-    public class MediaPart
-    {
-        public List<MediaSegment> MediaSegments { get; set; } = new List<MediaSegment>();
-    }
 }

src/N_m3u8DL-RE.Common/Entity/MediaSegment.cs

@@ -1,33 +1,31 @@
-using System;
+using N_m3u8DL_RE.Common.Enum;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Entity
+namespace N_m3u8DL_RE.Common.Entity;
+
+public class MediaSegment
 {
-    public class MediaSegment
-    {
     public long Index { get; set; }
     public double Duration { get; set; }
     public string? Title { get; set; }
     public DateTime? DateTime { get; set; }
 
     public long? StartRange { get; set; }
-        public long? StopRange { get => (StartRange != null && ExpectLength != null) ? StartRange + ExpectLength - 1 : null; }
+    public long? StopRange => (StartRange != null && ExpectLength != null) ? StartRange + ExpectLength - 1 : null;
     public long? ExpectLength { get; set; }
 
-        public EncryptInfo EncryptInfo { get; set; } = new EncryptInfo();
+    public EncryptInfo EncryptInfo { get; set; } = new();
     
-        public string Url { get; set; }
+    public bool IsEncrypted => EncryptInfo.Method != EncryptMethod.NONE;
 
-        public string? NameFromVar { get; set; } //MPD分段文件名
+    public string Url { get; set; } = string.Empty;
+
+    public string? NameFromVar { get; set; } // MPD分段文件名
 
     public override bool Equals(object? obj)
     {
         return obj is MediaSegment segment &&
                Index == segment.Index &&
-                   Duration == segment.Duration &&
+               Math.Abs(Duration - segment.Duration) < 0.001 &&
                Title == segment.Title &&
                StartRange == segment.StartRange &&
                StopRange == segment.StopRange &&
@@ -39,5 +37,4 @@ namespace N_m3u8DL_RE.Common.Entity
     {
         return HashCode.Combine(Index, Duration, Title, StartRange, StopRange, ExpectLength, Url);
     }
-    }
 }

src/N_m3u8DL-RE.Common/Entity/Playlist.cs

@@ -1,27 +1,20 @@
-using N_m3u8DL_RE.Common.Enum;
+namespace N_m3u8DL_RE.Common.Entity;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Entity
+public class Playlist
 {
-    public class Playlist
+    // 对应Url信息
-    {
+    public string Url { get; set; } = string.Empty;
-        //对应Url信息
+    // 是否直播
-        public string Url { get; set; }
-        //是否直播
     public bool IsLive { get; set; } = false;
-        //直播刷新间隔毫秒（默认15秒）
+    // 直播刷新间隔毫秒（默认15秒）
     public double RefreshIntervalMs { get; set; } = 15000;
-        //所有分片时长总和
+    // 所有分片时长总和
-        public double TotalDuration { get => MediaParts.Sum(x => x.MediaSegments.Sum(m => m.Duration)); }
+    public double TotalDuration => MediaParts.Sum(x => x.MediaSegments.Sum(m => m.Duration));
-        //所有分片中最长时长
+
+    // 所有分片中最长时长
     public double? TargetDuration { get; set; }
-        //INIT信息
+    // INIT信息
     public MediaSegment? MediaInit { get; set; }
-        //分片信息
+    // 分片信息
-        public List<MediaPart> MediaParts { get; set; } = new List<MediaPart>();
+    public List<MediaPart> MediaParts { get; set; } = [];
-    }
 }

src/N_m3u8DL-RE.Common/Entity/StreamSpec.cs

@@ -1,29 +1,24 @@
 using N_m3u8DL_RE.Common.Enum;
 using N_m3u8DL_RE.Common.Util;
 using Spectre.Console;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Entity
+namespace N_m3u8DL_RE.Common.Entity;
+
+public class StreamSpec
 {
-    public class StreamSpec
-    {
     public MediaType? MediaType { get; set; }
     public string? GroupId { get; set; }
     public string? Language { get; set; }
     public string? Name { get; set; }
     public Choise? Default { get; set; }
 
-        //由于用户选择 被跳过的分片总时长
+    // 由于用户选择 被跳过的分片总时长
     public double? SkippedDuration { get; set; }
 
-        //MSS信息
+    // MSS信息
     public MSSData? MSSData { get; set; }
 
-        //基本信息
+    // 基本信息
     public int? Bandwidth { get; set; }
     public string? Codecs { get; set; }
     public string? Resolution { get; set; }
@@ -31,17 +26,17 @@ namespace N_m3u8DL_RE.Common.Entity
     public string? Channels { get; set; }
     public string? Extension { get; set; }
 
-        //Dash
+    // Dash
     public RoleType? Role { get; set; }
 
-        //补充信息-色域
+    // 补充信息-色域
     public string? VideoRange { get; set; }
-        //补充信息-特征
+    // 补充信息-特征
     public string? Characteristics { get; set; }
-        //发布时间（仅MPD需要）
+    // 发布时间（仅MPD需要）
     public DateTime? PublishTime { get; set; }
 
-        //外部轨道GroupId (后续寻找对应轨道信息)
+    // 外部轨道GroupId (后续寻找对应轨道信息)
     public string? AudioId { get; set; }
     public string? VideoId { get; set; }
     public string? SubtitleId { get; set; }
@@ -51,12 +46,12 @@ namespace N_m3u8DL_RE.Common.Entity
     /// <summary>
     /// URL
     /// </summary>
-        public string Url { get; set; }
+    public string Url { get; set; } = string.Empty;
 
     /// <summary>
     /// 原始URL
     /// </summary>
-        public string OriginalUrl { get; set; }
+    public string OriginalUrl { get; set; } = string.Empty;
 
     public Playlist? Playlist { get; set; }
 
@@ -143,7 +138,7 @@ namespace N_m3u8DL_RE.Common.Entity
         var encStr = string.Empty;
         var segmentsCountStr = SegmentsCount == 0 ? "" : (SegmentsCount > 1 ? $"{SegmentsCount} Segments" : $"{SegmentsCount} Segment");
 
-            //增加加密标志
+        // 增加加密标志
         if (Playlist != null && Playlist.MediaParts.Any(m => m.MediaSegments.Any(s => s.EncryptInfo.Method != EncryptMethod.NONE)))
         {
             var ms = Playlist.MediaParts.SelectMany(m => m.MediaSegments.Select(s => s.EncryptInfo.Method)).Where(e => e != EncryptMethod.NONE).Distinct();
@@ -175,7 +170,7 @@ namespace N_m3u8DL_RE.Common.Entity
             returnStr = returnStr.Replace("|  |", "|");
         }
 
-            //计算时长
+        // 计算时长
         if (Playlist != null)
         {
             var total = Playlist.TotalDuration;
@@ -184,5 +179,4 @@ namespace N_m3u8DL_RE.Common.Entity
 
         return returnStr.TrimEnd().TrimEnd('|').TrimEnd();
     }
-    }
 }

src/N_m3u8DL-RE.Common/Entity/SubCue.cs

@@ -1,13 +1,7 @@
-using System;
+namespace N_m3u8DL_RE.Common.Entity;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Entity
+public class SubCue
 {
-    public class SubCue
-    {
     public TimeSpan StartTime { get; set; }
     public TimeSpan EndTime { get; set; }
     public required string Payload { get; set; }
@@ -26,5 +20,4 @@ namespace N_m3u8DL_RE.Common.Entity
     {
         return HashCode.Combine(StartTime, EndTime, Payload, Settings);
     }
-    }
 }

src/N_m3u8DL-RE.Common/Entity/WebVttSub.cs

@@ -1,24 +1,20 @@
-using System;
+using System.Text;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 using System.Text.RegularExpressions;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Entity
+namespace N_m3u8DL_RE.Common.Entity;
+
+public partial class WebVttSub
 {
-    public partial class WebVttSub
-    {
     [GeneratedRegex("X-TIMESTAMP-MAP.*")]
     private static partial Regex TSMapRegex();
     [GeneratedRegex("MPEGTS:(\\d+)")]
     private static partial Regex TSValueRegex();
     [GeneratedRegex("\\s")]
     private static partial Regex SplitRegex();
-        [GeneratedRegex("<c\\..*?>([\\s\\S]*?)<\\/c>")]
+    [GeneratedRegex(@"<c\..*?>([\s\S]*?)<\/c>")]
     private static partial Regex VttClassRegex();
 
-        public List<SubCue> Cues { get; set; } = new List<SubCue>();
+    public List<SubCue> Cues { get; set; } = [];
     public long MpegtsTimestamp { get; set; } = 0L;
 
     /// <summary>
@@ -75,12 +71,12 @@ namespace N_m3u8DL_RE.Common.Entity
                 continue;
             }
 
-                if (needPayload)
+            if (!needPayload) continue;
-                {
+            
             if (string.IsNullOrEmpty(line.Trim()))
             {
                 var payload = string.Join(Environment.NewLine, payloads);
-                        if (string.IsNullOrEmpty(payload.Trim())) continue; //没获取到payload 跳过添加
+                if (string.IsNullOrEmpty(payload.Trim())) continue; // 没获取到payload 跳过添加
 
                 var arr = SplitRegex().Split(timeLine.Replace("-->", "")).Where(s => !string.IsNullOrEmpty(s)).ToList();
                 var startTime = ConvertToTS(arr[0]);
@@ -90,7 +86,7 @@ namespace N_m3u8DL_RE.Common.Entity
                 {
                     StartTime = startTime,
                     EndTime = endTime,
-                            Payload = RemoveClassTag(string.Join("", payload.Where(c => c != 8203))), //Remove Zero Width Space!
+                    Payload = RemoveClassTag(string.Join("", payload.Where(c => c != 8203))), // Remove Zero Width Space!
                     Settings = style
                 });
                 payloads.Clear();
@@ -101,10 +97,9 @@ namespace N_m3u8DL_RE.Common.Entity
                 payloads.Add(line.Trim());
             }
         }
-            }
 
-            if (BaseTimestamp != 0)
+        if (BaseTimestamp == 0) return webSub;
-            {
+        
         foreach (var item in webSub.Cues)
         {
             if (item.StartTime.TotalMilliseconds - BaseTimestamp >= 0)
@@ -117,7 +112,6 @@ namespace N_m3u8DL_RE.Common.Entity
                 break;
             }
         }
-            }
 
         return webSub;
     }
@@ -131,7 +125,7 @@ namespace N_m3u8DL_RE.Common.Entity
                 return string.Concat(VttClassRegex().Matches(line).Select(x => x.Groups[1].Value + " "));
             })).TrimEnd();
         }
-            else return text;
+        return text;
     }
 
     /// <summary>
@@ -144,9 +138,9 @@ namespace N_m3u8DL_RE.Common.Entity
         FixTimestamp(webSub, this.MpegtsTimestamp);
         foreach (var item in webSub.Cues)
         {
-                if (!this.Cues.Contains(item))
+            if (this.Cues.Contains(item)) continue;
-                {
+            
-                    //如果相差只有1ms，且payload相同，则拼接
+            // 如果相差只有1ms，且payload相同，则拼接
             var last = this.Cues.LastOrDefault();
             if (last != null && this.Cues.Count > 0 && (item.StartTime - last.EndTime).TotalMilliseconds <= 1 && item.Payload == last.Payload) 
             {
@@ -157,7 +151,6 @@ namespace N_m3u8DL_RE.Common.Entity
                 this.Cues.Add(item);
             }
         }
-            }
         return this;
     }
 
@@ -168,19 +161,19 @@ namespace N_m3u8DL_RE.Common.Entity
             return;
         }
 
-            //确实存在时间轴错误的情况，才修复
+        // 确实存在时间轴错误的情况，才修复
         if ((this.Cues.Count > 0 && sub.Cues.Count > 0 && sub.Cues.First().StartTime < this.Cues.Last().EndTime && sub.Cues.First().EndTime != this.Cues.Last().EndTime) || this.Cues.Count == 0)
         {
-                //The MPEG2 transport stream clocks (PCR, PTS, DTS) all have units of 1/90000 second
+            // The MPEG2 transport stream clocks (PCR, PTS, DTS) all have units of 1/90000 second
             var seconds = (sub.MpegtsTimestamp - baseTimestamp) / 90000;
             var offset = TimeSpan.FromSeconds(seconds);
-                //当前预添加的字幕的起始时间小于实际上已经走过的时间(如offset已经是100秒，而字幕起始却是2秒)，才修复
+            // 当前预添加的字幕的起始时间小于实际上已经走过的时间(如offset已经是100秒，而字幕起始却是2秒)，才修复
             if (sub.Cues.Count > 0 && sub.Cues.First().StartTime < offset)
             {
-                    for (int i = 0; i < sub.Cues.Count; i++)
+                foreach (var subCue in sub.Cues)
                 {
-                        sub.Cues[i].StartTime += offset;
+                    subCue.StartTime += offset;
-                        sub.Cues[i].EndTime += offset;
+                    subCue.EndTime += offset;
                 }
             }
         }
@@ -193,7 +186,7 @@ namespace N_m3u8DL_RE.Common.Entity
 
     private static TimeSpan ConvertToTS(string str)
     {
-            //17.0s
+        // 17.0s
         if (str.EndsWith('s'))
         {
             double sec = Convert.ToDouble(str[..^1]);
@@ -201,11 +194,15 @@ namespace N_m3u8DL_RE.Common.Entity
         }
 
         str = str.Replace(',', '.');
-            var ms = Convert.ToInt32(str.Split('.').Last());
+        long time = 0;
-            var o = str.Split('.').First();
+        string[] parts = str.Split('.');
-            var t = o.Split(':').Reverse().ToList();
+        if (parts.Length > 1)
-            var time = 0L + ms;
+        {
-            for (int i = 0; i < t.Count(); i++)
+            time += Convert.ToInt32(parts.Last().PadRight(3, '0'));
+            str = parts.First();
+        }
+        var t = str.Split(':').Reverse().ToList();
+        for (int i = 0; i < t.Count; i++)
         {
             time += (long)Math.Pow(60, i) * Convert.ToInt32(t[i]) * 1000;
         }
@@ -214,8 +211,8 @@ namespace N_m3u8DL_RE.Common.Entity
 
     public override string ToString()
     {
-            StringBuilder sb = new StringBuilder();
+        var sb = new StringBuilder();
-            foreach (var c in GetCues())  //输出时去除空串
+        foreach (var c in GetCues())  // 输出时去除空串
         {
             sb.AppendLine(c.StartTime.ToString(@"hh\:mm\:ss\.fff") + " --> " + c.EndTime.ToString(@"hh\:mm\:ss\.fff") + " " + c.Settings);
             sb.AppendLine(c.Payload);
@@ -263,10 +260,9 @@ namespace N_m3u8DL_RE.Common.Entity
 
         if (string.IsNullOrEmpty(srt.Trim()))
         {
-                srt = "1\r\n00:00:00,000 --> 00:00:01,000"; //空字幕
+            srt = "1\r\n00:00:00,000 --> 00:00:01,000"; // 空字幕
         }
 
         return srt;
     }
-    }
 }

src/N_m3u8DL-RE.Common/Enum/Choise.cs

@@ -1,14 +1,7 @@
-using System;
+namespace N_m3u8DL_RE.Common.Enum;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Enum
+public enum Choise
 {
-    public enum Choise
-    {
     YES = 1,
     NO = 0
-    }
 }

src/N_m3u8DL-RE.Common/Enum/EncryptMethod.cs

@@ -1,13 +1,7 @@
-using System;
+namespace N_m3u8DL_RE.Common.Enum;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Enum
+public enum EncryptMethod
 {
-    public enum EncryptMethod
-    {
     NONE,
     AES_128,
     AES_128_ECB,
@@ -16,5 +10,4 @@ namespace N_m3u8DL_RE.Common.Enum
     CENC,
     CHACHA20,
     UNKNOWN
-    }
 }

src/N_m3u8DL-RE.Common/Enum/ExtractorType.cs

@@ -1,16 +1,9 @@
-using System;
+namespace N_m3u8DL_RE.Common.Enum;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Enum
+public enum ExtractorType
 {
-    public enum ExtractorType
-    {
     MPEG_DASH,
     HLS,
     HTTP_LIVE,
     MSS
-    }
 }

src/N_m3u8DL-RE.Common/Enum/MediaType.cs

@@ -1,16 +1,9 @@
-using System;
+namespace N_m3u8DL_RE.Common.Enum;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Enum
+public enum MediaType
 {
-    public enum MediaType
-    {
     AUDIO = 0,
     VIDEO = 1,
     SUBTITLES = 2,
     CLOSED_CAPTIONS = 3
-    }
 }

src/N_m3u8DL-RE.Common/Enum/RoleType.cs

@@ -1,7 +1,7 @@
-namespace N_m3u8DL_RE.Common.Enum
+namespace N_m3u8DL_RE.Common.Enum;
+
+public enum RoleType
 {
-    public enum RoleType
-    {
     Subtitle = 0,
     Main = 1,
     Alternate = 2,
@@ -11,5 +11,5 @@
     Description = 6,
     Sign = 7,
     Metadata = 8,
-    }
+    ForcedSubtitle = 9
 }

src/N_m3u8DL-RE.Common/JsonContext/JsonContext.cs

@@ -2,21 +2,20 @@
 using N_m3u8DL_RE.Common.Enum;
 using System.Text.Json.Serialization;
 
-namespace N_m3u8DL_RE.Common
+namespace N_m3u8DL_RE.Common;
-{
+
-    [JsonSourceGenerationOptions(
+[JsonSourceGenerationOptions(
     WriteIndented = true,
     PropertyNamingPolicy = JsonKnownNamingPolicy.CamelCase,
     GenerationMode = JsonSourceGenerationMode.Metadata)]
-    [JsonSerializable(typeof(MediaType))]
+[JsonSerializable(typeof(MediaType))]
-    [JsonSerializable(typeof(EncryptMethod))]
+[JsonSerializable(typeof(EncryptMethod))]
-    [JsonSerializable(typeof(ExtractorType))]
+[JsonSerializable(typeof(ExtractorType))]
-    [JsonSerializable(typeof(Choise))]
+[JsonSerializable(typeof(Choise))]
-    [JsonSerializable(typeof(StreamSpec))]
+[JsonSerializable(typeof(StreamSpec))]
-    [JsonSerializable(typeof(IOrderedEnumerable<StreamSpec>))]
+[JsonSerializable(typeof(IOrderedEnumerable<StreamSpec>))]
-    [JsonSerializable(typeof(IEnumerable<MediaSegment>))]
+[JsonSerializable(typeof(IEnumerable<MediaSegment>))]
-    [JsonSerializable(typeof(List<StreamSpec>))]
+[JsonSerializable(typeof(List<StreamSpec>))]
-    [JsonSerializable(typeof(List<MediaSegment>))]
+[JsonSerializable(typeof(List<MediaSegment>))]
-    [JsonSerializable(typeof(Dictionary<string, string>))]
+[JsonSerializable(typeof(Dictionary<string, string>))]
-    internal partial class JsonContext : JsonSerializerContext { }
+internal partial class JsonContext : JsonSerializerContext { }
-}

src/N_m3u8DL-RE.Common/JsonConverter/BytesBase64Converter.cs

@@ -1,17 +1,11 @@
-using System;
+using System.Text.Json;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Text.Json;
 using System.Text.Json.Serialization;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.JsonConverter
+namespace N_m3u8DL_RE.Common.JsonConverter;
+
+internal class BytesBase64Converter : JsonConverter<byte[]>
 {
-    internal class BytesBase64Converter : JsonConverter<byte[]>
-    {
     public override byte[] Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options) => reader.GetBytesFromBase64();
 
     public override void Write(Utf8JsonWriter writer, byte[] value, JsonSerializerOptions options) => writer.WriteStringValue(Convert.ToBase64String(value));
-    }
 }

src/N_m3u8DL-RE.Common/Log/CustomAnsiConsole.cs

@@ -4,39 +4,46 @@ using Spectre.Console;
 
 namespace N_m3u8DL_RE.Common.Log;
 
-public class NonAnsiWriter : TextWriter
+public partial class NonAnsiWriter : TextWriter
 {
     public override Encoding Encoding => Console.OutputEncoding;
 
-    private string lastOut = "";
+    private string? _lastOut = "";
 
     public override void Write(char value)
     {
         Console.Write(value);
     }
 
-    public override void Write(string value)
+    public override void Write(string? value)
     {
-        if (lastOut == value)
+        if (_lastOut == value)
         {
             return;
         }
-        lastOut = value;
+        _lastOut = value;
         RemoveAnsiEscapeSequences(value);
     }
 
-    private void RemoveAnsiEscapeSequences(string input)
+    private void RemoveAnsiEscapeSequences(string? input)
     {
         // Use regular expression to remove ANSI escape sequences
-        string output = Regex.Replace(input, @"\x1B\[(\d+;?)+m", "");
+        var output = MyRegex().Replace(input ?? "", "");
-        output = Regex.Replace(output, @"\[\??\d+[AKlh]", "");
+        output = MyRegex1().Replace(output, "");
-        output = Regex.Replace(output,"[\r\n] +","");
+        output = MyRegex2().Replace(output, "");
         if (string.IsNullOrWhiteSpace(output))
         {
             return;
         }
         Console.Write(output);
     }
+
+    [GeneratedRegex(@"\x1B\[(\d+;?)+m")]
+    private static partial Regex MyRegex();
+    [GeneratedRegex(@"\[\??\d+[AKlh]")]
+    private static partial Regex MyRegex1();
+    [GeneratedRegex("[\r\n] +")]
+    private static partial Regex MyRegex2();
 }
 
 /// <summary>

src/N_m3u8DL-RE.Common/Log/LogLevel.cs

@@ -1,17 +1,10 @@
-using System;
+namespace N_m3u8DL_RE.Common.Log;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Log
+public enum LogLevel
 {
-    public enum LogLevel
-    {
     OFF,
     ERROR,
     WARN,
     INFO,
     DEBUG,
-    }
 }

src/N_m3u8DL-RE.Common/Log/Logger.cs

@@ -1,17 +1,11 @@
 using Spectre.Console;
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
 using System.Text;
 using System.Text.RegularExpressions;
-using System.Threading.Tasks;
-using static System.Net.Mime.MediaTypeNames;
 
-namespace N_m3u8DL_RE.Common.Log
+namespace N_m3u8DL_RE.Common.Log;
+
+public static partial class Logger
 {
-    public partial class Logger
-    {
     [GeneratedRegex("{}")]
     private static partial Regex VarsRepRegex();
 
@@ -30,7 +24,7 @@ namespace N_m3u8DL_RE.Common.Log
     /// </summary>
     private static string? LogFilePath { get; set; }
 
-        //读写锁
+    // 读写锁
     static ReaderWriterLockSlim LogWriteLock = new ReaderWriterLockSlim();
 
     public static void InitLogFile()
@@ -54,7 +48,7 @@ namespace N_m3u8DL_RE.Common.Log
                           + "Task Start: " + now.ToString("yyyy/MM/dd HH:mm:ss") + Environment.NewLine
                           + "Task CommandLine: " + Environment.CommandLine;
             init += $"{Environment.NewLine}{Environment.NewLine}";
-                //若文件存在则加序号
+            // 若文件存在则加序号
             while (File.Exists(LogFilePath))
             {
                 LogFilePath = Path.Combine(Path.GetDirectoryName(LogFilePath)!, $"{fileName}-{index++}.log");
@@ -86,12 +80,12 @@ namespace N_m3u8DL_RE.Common.Log
                 Console.WriteLine(subWrite);
             }
 
-                if (IsWriteFile && File.Exists(LogFilePath))
+            if (!IsWriteFile || !File.Exists(LogFilePath)) return;
-                {
+            
             var plain = write.RemoveMarkup() + subWrite.RemoveMarkup();
             try
             {
-                        //进入写入
+                // 进入写入
                 LogWriteLock.EnterWriteLock();
                 using (StreamWriter sw = File.AppendText(LogFilePath))
                 {
@@ -100,11 +94,10 @@ namespace N_m3u8DL_RE.Common.Log
             }
             finally
             {
-                        //释放占用
+                // 释放占用
                 LogWriteLock.ExitWriteLock();
             }
         }
-            }
         catch (Exception)
         {
             Console.WriteLine("Failed to write: " + write);
@@ -123,83 +116,75 @@ namespace N_m3u8DL_RE.Common.Log
 
     public static void Info(string data, params object[] ps)
     {
-            if (LogLevel >= LogLevel.INFO)
+        if (LogLevel < LogLevel.INFO) return;
-            {
+        
         data = ReplaceVars(data, ps);
         var write = GetCurrTime() + " " + "[underline #548c26]INFO[/] : ";
         HandleLog(write, data);
     }
-        }
 
     public static void InfoMarkUp(string data, params object[] ps)
     {
-            if (LogLevel >= LogLevel.INFO)
+        if (LogLevel < LogLevel.INFO) return;
-            {
+        
         data = ReplaceVars(data, ps);
         var write = GetCurrTime() + " " + "[underline #548c26]INFO[/] : " + data;
         HandleLog(write);
     }
-        }
 
     public static void Debug(string data, params object[] ps)
     {
-            if (LogLevel >= LogLevel.DEBUG)
+        if (LogLevel < LogLevel.DEBUG) return;
-            {
+        
         data = ReplaceVars(data, ps);
         var write = GetCurrTime() + " " + "[underline grey]DEBUG[/]: ";
         HandleLog(write, data);
     }
-        }
 
     public static void DebugMarkUp(string data, params object[] ps)
     {
-            if (LogLevel >= LogLevel.DEBUG)
+        if (LogLevel < LogLevel.DEBUG) return;
-            {
+        
         data = ReplaceVars(data, ps);
         var write = GetCurrTime() + " " + "[underline grey]DEBUG[/]: " + data;
         HandleLog(write);
     }
-        }
 
     public static void Warn(string data, params object[] ps)
     {
-            if (LogLevel >= LogLevel.WARN)
+        if (LogLevel < LogLevel.WARN) return;
-            {
+        
         data = ReplaceVars(data, ps);
         var write = GetCurrTime() + " " + "[underline #a89022]WARN[/] : ";
         HandleLog(write, data);
     }
-        }
 
     public static void WarnMarkUp(string data, params object[] ps)
     {
-            if (LogLevel >= LogLevel.WARN)
+        if (LogLevel < LogLevel.WARN) return;
-            {
+        
         data = ReplaceVars(data, ps);
         var write = GetCurrTime() + " " + "[underline #a89022]WARN[/] : " + data;
         HandleLog(write);
     }
-        }
 
     public static void Error(string data, params object[] ps)
     {
-            if (LogLevel >= LogLevel.ERROR)
+        if (LogLevel < LogLevel.ERROR) return;
-            {
+        
         data = ReplaceVars(data, ps);
         var write = GetCurrTime() + " " + "[underline red1]ERROR[/]: ";
         HandleLog(write, data);
     }
-        }
 
     public static void ErrorMarkUp(string data, params object[] ps)
     {
-            if (LogLevel >= LogLevel.ERROR)
+        if (LogLevel < LogLevel.ERROR) return;
-            {
+        
         data = ReplaceVars(data, ps);
         var write = GetCurrTime() + " " + "[underline red1]ERROR[/]: " + data;
         HandleLog(write);
     }
-        }
 
     public static void ErrorMarkUp(Exception exception)
     {
@@ -219,13 +204,13 @@ namespace N_m3u8DL_RE.Common.Log
     /// <param name="ps"></param>
     public static void Extra(string data, params object[] ps)
     {
-            if (IsWriteFile && File.Exists(LogFilePath))
+        if (!IsWriteFile || !File.Exists(LogFilePath)) return;
-            {
+        
         data = ReplaceVars(data, ps);
         var plain = GetCurrTime() + " " + "EXTRA: " + data.RemoveMarkup();
         try
         {
-                    //进入写入
+            // 进入写入
             LogWriteLock.EnterWriteLock();
             using (StreamWriter sw = File.AppendText(LogFilePath))
             {
@@ -234,10 +219,8 @@ namespace N_m3u8DL_RE.Common.Log
         }
         finally
         {
-                    //释放占用
+            // 释放占用
             LogWriteLock.ExitWriteLock();
         }
     }
-        }
-    }
 }

src/N_m3u8DL-RE.Common/N_m3u8DL-RE.Common.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
 	<OutputType>library</OutputType>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <RootNamespace>N_m3u8DL_RE.Common</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <LangVersion>preview</LangVersion>
@@ -10,7 +10,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-	  <PackageReference Include="Spectre.Console" Version="0.47.1-preview.0.11" />
+	  <PackageReference Include="Spectre.Console" Version="0.49.2-preview.0.50" />
   </ItemGroup>
 	
 </Project>

src/N_m3u8DL-RE.Common/Resource/ResString.cs

@@ -1,151 +1,150 @@
-using System;
+namespace N_m3u8DL_RE.Common.Resource;
-using System.Collections.Generic;
-using System.Globalization;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Resource
+public static class ResString
 {
-    public class ResString
+    public static string CurrentLoc { get; set; } = "en-US";
-    {
+
-        public readonly static string ReLiveTs = "<RE_LIVE_TS>";
+    public static readonly string ReLiveTs = "<RE_LIVE_TS>";
-        public static string singleFileRealtimeDecryptWarn { get => GetText("singleFileRealtimeDecryptWarn"); }
+    public static string singleFileRealtimeDecryptWarn => GetText("singleFileRealtimeDecryptWarn");
-        public static string singleFileSplitWarn { get => GetText("singleFileSplitWarn"); }
+    public static string singleFileSplitWarn => GetText("singleFileSplitWarn");
-        public static string customRangeWarn { get => GetText("customRangeWarn"); }
+    public static string customRangeWarn => GetText("customRangeWarn");
-        public static string customRangeFound { get => GetText("customRangeFound"); }
+    public static string customRangeFound => GetText("customRangeFound");
-        public static string customAdKeywordsFound { get => GetText("customAdKeywordsFound"); }
+    public static string customAdKeywordsFound => GetText("customAdKeywordsFound");
-        public static string customRangeInvalid { get => GetText("customRangeInvalid"); }
+    public static string customRangeInvalid => GetText("customRangeInvalid");
-        public static string consoleRedirected { get => GetText("consoleRedirected"); }
+    public static string consoleRedirected => GetText("consoleRedirected");
-        public static string autoBinaryMerge { get => GetText("autoBinaryMerge"); }
+    public static string autoBinaryMerge => GetText("autoBinaryMerge");
-        public static string autoBinaryMerge2 { get => GetText("autoBinaryMerge2"); }
+    public static string autoBinaryMerge2 => GetText("autoBinaryMerge2");
-        public static string autoBinaryMerge3 { get => GetText("autoBinaryMerge3"); }
+    public static string autoBinaryMerge3 => GetText("autoBinaryMerge3");
-        public static string autoBinaryMerge4 { get => GetText("autoBinaryMerge4"); }
+    public static string autoBinaryMerge4 => GetText("autoBinaryMerge4");
-        public static string autoBinaryMerge5 { get => GetText("autoBinaryMerge5"); }
+    public static string autoBinaryMerge5 => GetText("autoBinaryMerge5");
-        public static string autoBinaryMerge6 { get => GetText("autoBinaryMerge6"); }
+    public static string autoBinaryMerge6 => GetText("autoBinaryMerge6");
-        public static string badM3u8 { get => GetText("badM3u8"); }
+    public static string badM3u8 => GetText("badM3u8");
-        public static string binaryMerge { get => GetText("binaryMerge"); }
+    public static string binaryMerge => GetText("binaryMerge");
-        public static string checkingLast { get => GetText("checkingLast"); }
+    public static string checkingLast => GetText("checkingLast");
-        public static string cmd_appendUrlParams { get => GetText("cmd_appendUrlParams"); }
+    public static string cmd_appendUrlParams => GetText("cmd_appendUrlParams");
-        public static string cmd_autoSelect { get => GetText("cmd_autoSelect"); }
+    public static string cmd_autoSelect => GetText("cmd_autoSelect");
-        public static string cmd_binaryMerge { get => GetText("cmd_binaryMerge"); }
+    public static string cmd_disableUpdateCheck => GetText("cmd_disableUpdateCheck");
-        public static string cmd_useFFmpegConcatDemuxer { get => GetText("cmd_useFFmpegConcatDemuxer"); }
+    public static string cmd_binaryMerge => GetText("cmd_binaryMerge");
-        public static string cmd_checkSegmentsCount { get => GetText("cmd_checkSegmentsCount"); }
+    public static string cmd_useFFmpegConcatDemuxer => GetText("cmd_useFFmpegConcatDemuxer");
-        public static string cmd_decryptionBinaryPath { get => GetText("cmd_decryptionBinaryPath"); }
+    public static string cmd_checkSegmentsCount => GetText("cmd_checkSegmentsCount");
-        public static string cmd_delAfterDone { get => GetText("cmd_delAfterDone"); }
+    public static string cmd_decryptionBinaryPath => GetText("cmd_decryptionBinaryPath");
-        public static string cmd_ffmpegBinaryPath { get => GetText("cmd_ffmpegBinaryPath"); }
+    public static string cmd_delAfterDone => GetText("cmd_delAfterDone");
-        public static string cmd_mkvmergeBinaryPath { get => GetText("cmd_mkvmergeBinaryPath"); }
+    public static string cmd_ffmpegBinaryPath => GetText("cmd_ffmpegBinaryPath");
-        public static string cmd_baseUrl { get => GetText("cmd_baseUrl"); }
+    public static string cmd_mkvmergeBinaryPath => GetText("cmd_mkvmergeBinaryPath");
-        public static string cmd_maxSpeed { get => GetText("cmd_maxSpeed"); }
+    public static string cmd_baseUrl => GetText("cmd_baseUrl");
-        public static string cmd_adKeyword { get => GetText("cmd_adKeyword"); }
+    public static string cmd_maxSpeed => GetText("cmd_maxSpeed");
-        public static string cmd_moreHelp { get => GetText("cmd_moreHelp"); }
+    public static string cmd_adKeyword => GetText("cmd_adKeyword");
-        public static string cmd_header { get => GetText("cmd_header"); }
+    public static string cmd_moreHelp => GetText("cmd_moreHelp");
-        public static string cmd_muxImport { get => GetText("cmd_muxImport"); }
+    public static string cmd_header => GetText("cmd_header");
-        public static string cmd_muxImport_more { get => GetText("cmd_muxImport_more"); }
+    public static string cmd_muxImport => GetText("cmd_muxImport");
-        public static string cmd_selectVideo { get => GetText("cmd_selectVideo"); }
+    public static string cmd_muxImport_more => GetText("cmd_muxImport_more");
-        public static string cmd_dropVideo { get => GetText("cmd_dropVideo"); }
+    public static string cmd_selectVideo => GetText("cmd_selectVideo");
-        public static string cmd_selectVideo_more { get => GetText("cmd_selectVideo_more"); }
+    public static string cmd_dropVideo => GetText("cmd_dropVideo");
-        public static string cmd_selectAudio { get => GetText("cmd_selectAudio"); }
+    public static string cmd_selectVideo_more => GetText("cmd_selectVideo_more");
-        public static string cmd_dropAudio { get => GetText("cmd_dropAudio"); }
+    public static string cmd_selectAudio => GetText("cmd_selectAudio");
-        public static string cmd_selectAudio_more { get => GetText("cmd_selectAudio_more"); }
+    public static string cmd_dropAudio => GetText("cmd_dropAudio");
-        public static string cmd_selectSubtitle { get => GetText("cmd_selectSubtitle"); }
+    public static string cmd_selectAudio_more => GetText("cmd_selectAudio_more");
-        public static string cmd_dropSubtitle { get => GetText("cmd_dropSubtitle"); }
+    public static string cmd_selectSubtitle => GetText("cmd_selectSubtitle");
-        public static string cmd_selectSubtitle_more { get => GetText("cmd_selectSubtitle_more"); }
+    public static string cmd_dropSubtitle => GetText("cmd_dropSubtitle");
-        public static string cmd_custom_range { get => GetText("cmd_custom_range"); }
+    public static string cmd_selectSubtitle_more => GetText("cmd_selectSubtitle_more");
-        public static string cmd_customHLSMethod { get => GetText("cmd_customHLSMethod"); }
+    public static string cmd_custom_range => GetText("cmd_custom_range");
-        public static string cmd_customHLSKey { get => GetText("cmd_customHLSKey"); }
+    public static string cmd_customHLSMethod => GetText("cmd_customHLSMethod");
-        public static string cmd_customHLSIv { get => GetText("cmd_customHLSIv"); }
+    public static string cmd_customHLSKey => GetText("cmd_customHLSKey");
-        public static string cmd_Input { get => GetText("cmd_Input"); }
+    public static string cmd_customHLSIv => GetText("cmd_customHLSIv");
-        public static string cmd_forceAnsiConsole { get => GetText("cmd_forceAnsiConsole"); }
+    public static string cmd_Input => GetText("cmd_Input");
-        public static string cmd_noAnsiColor { get => GetText("cmd_noAnsiColor"); }
+    public static string cmd_forceAnsiConsole => GetText("cmd_forceAnsiConsole");
-        public static string cmd_keys { get => GetText("cmd_keys"); }
+    public static string cmd_noAnsiColor => GetText("cmd_noAnsiColor");
-        public static string cmd_keyText { get => GetText("cmd_keyText"); }
+    public static string cmd_keys => GetText("cmd_keys");
-        public static string cmd_loadKeyFailed { get => GetText("cmd_loadKeyFailed"); }
+    public static string cmd_keyText => GetText("cmd_keyText");
-        public static string cmd_logLevel { get => GetText("cmd_logLevel"); }
+    public static string cmd_loadKeyFailed => GetText("cmd_loadKeyFailed");
-        public static string cmd_MP4RealTimeDecryption { get => GetText("cmd_MP4RealTimeDecryption"); }
+    public static string cmd_logLevel => GetText("cmd_logLevel");
-        public static string cmd_saveDir { get => GetText("cmd_saveDir"); }
+    public static string cmd_MP4RealTimeDecryption => GetText("cmd_MP4RealTimeDecryption");
-        public static string cmd_saveName { get => GetText("cmd_saveName"); }
+    public static string cmd_saveDir => GetText("cmd_saveDir");
-        public static string cmd_savePattern { get => GetText("cmd_savePattern"); }
+    public static string cmd_saveName => GetText("cmd_saveName");
-        public static string cmd_skipDownload { get => GetText("cmd_skipDownload"); }
+    public static string cmd_savePattern => GetText("cmd_savePattern");
-        public static string cmd_noDateInfo { get => GetText("cmd_noDateInfo"); }
+    public static string cmd_skipDownload => GetText("cmd_skipDownload");
-        public static string cmd_noLog { get => GetText("cmd_noLog"); }
+    public static string cmd_noDateInfo => GetText("cmd_noDateInfo");
-        public static string cmd_skipMerge { get => GetText("cmd_skipMerge"); }
+    public static string cmd_noLog => GetText("cmd_noLog");
-        public static string cmd_subFormat { get => GetText("cmd_subFormat"); }
+    public static string cmd_allowHlsMultiExtMap => GetText("cmd_allowHlsMultiExtMap");
-        public static string cmd_subOnly { get => GetText("cmd_subOnly"); }
+    public static string cmd_skipMerge => GetText("cmd_skipMerge");
-        public static string cmd_subtitleFix { get => GetText("cmd_subtitleFix"); }
+    public static string cmd_subFormat => GetText("cmd_subFormat");
-        public static string cmd_threadCount { get => GetText("cmd_threadCount"); }
+    public static string cmd_subOnly => GetText("cmd_subOnly");
-        public static string cmd_downloadRetryCount { get => GetText("cmd_downloadRetryCount"); }
+    public static string cmd_subtitleFix => GetText("cmd_subtitleFix");
-        public static string cmd_tmpDir { get => GetText("cmd_tmpDir"); }
+    public static string cmd_threadCount => GetText("cmd_threadCount");
-        public static string cmd_uiLanguage { get => GetText("cmd_uiLanguage"); }
+    public static string cmd_downloadRetryCount => GetText("cmd_downloadRetryCount");
-        public static string cmd_urlProcessorArgs { get => GetText("cmd_urlProcessorArgs"); }
+    public static string cmd_httpRequestTimeout => GetText("cmd_httpRequestTimeout");
-        public static string cmd_useShakaPackager { get => GetText("cmd_useShakaPackager"); }
+    public static string cmd_tmpDir => GetText("cmd_tmpDir");
-        public static string cmd_concurrentDownload { get => GetText("cmd_concurrentDownload"); }
+    public static string cmd_uiLanguage => GetText("cmd_uiLanguage");
-        public static string cmd_useSystemProxy { get => GetText("cmd_useSystemProxy"); }
+    public static string cmd_urlProcessorArgs => GetText("cmd_urlProcessorArgs");
-        public static string cmd_customProxy { get => GetText("cmd_customProxy"); }
+    public static string cmd_useShakaPackager => GetText("cmd_useShakaPackager");
-        public static string cmd_customRange { get => GetText("cmd_customRange"); }
+    public static string cmd_decryptionEngine => GetText("cmd_decryptionEngine");
-        public static string cmd_liveKeepSegments { get => GetText("cmd_liveKeepSegments"); }
+    public static string cmd_concurrentDownload => GetText("cmd_concurrentDownload");
-        public static string cmd_livePipeMux { get => GetText("cmd_livePipeMux"); }
+    public static string cmd_useSystemProxy => GetText("cmd_useSystemProxy");
-        public static string cmd_liveRecordLimit { get => GetText("cmd_liveRecordLimit"); }
+    public static string cmd_customProxy => GetText("cmd_customProxy");
-        public static string cmd_taskStartAt { get => GetText("cmd_taskStartAt"); }
+    public static string cmd_customRange => GetText("cmd_customRange");
-        public static string cmd_liveWaitTime { get => GetText("cmd_liveWaitTime"); }
+    public static string cmd_liveKeepSegments => GetText("cmd_liveKeepSegments");
-        public static string cmd_liveTakeCount { get => GetText("cmd_liveTakeCount"); }
+    public static string cmd_livePipeMux => GetText("cmd_livePipeMux");
-        public static string cmd_liveFixVttByAudio { get => GetText("cmd_liveFixVttByAudio"); }
+    public static string cmd_liveRecordLimit => GetText("cmd_liveRecordLimit");
-        public static string cmd_liveRealTimeMerge { get => GetText("cmd_liveRealTimeMerge"); }
+    public static string cmd_taskStartAt => GetText("cmd_taskStartAt");
-        public static string cmd_livePerformAsVod { get => GetText("cmd_livePerformAsVod"); }
+    public static string cmd_liveWaitTime => GetText("cmd_liveWaitTime");
-        public static string cmd_muxAfterDone { get => GetText("cmd_muxAfterDone"); }
+    public static string cmd_liveTakeCount => GetText("cmd_liveTakeCount");
-        public static string cmd_muxAfterDone_more { get => GetText("cmd_muxAfterDone_more"); }
+    public static string cmd_liveFixVttByAudio => GetText("cmd_liveFixVttByAudio");
-        public static string cmd_writeMetaJson { get => GetText("cmd_writeMetaJson"); }
+    public static string cmd_liveRealTimeMerge => GetText("cmd_liveRealTimeMerge");
-        public static string liveLimit { get => GetText("liveLimit"); }
+    public static string cmd_livePerformAsVod => GetText("cmd_livePerformAsVod");
-        public static string realTimeDecMessage { get => GetText("realTimeDecMessage"); }
+    public static string cmd_muxAfterDone => GetText("cmd_muxAfterDone");
-        public static string liveLimitReached { get => GetText("liveLimitReached"); }
+    public static string cmd_muxAfterDone_more => GetText("cmd_muxAfterDone_more");
-        public static string saveName { get => GetText("saveName"); }
+    public static string cmd_writeMetaJson => GetText("cmd_writeMetaJson");
-        public static string taskStartAt { get => GetText("taskStartAt"); }
+    public static string liveLimit => GetText("liveLimit");
-        public static string namedPipeCreated { get => GetText("namedPipeCreated"); }
+    public static string realTimeDecMessage => GetText("realTimeDecMessage");
-        public static string namedPipeMux { get => GetText("namedPipeMux"); }
+    public static string liveLimitReached => GetText("liveLimitReached");
-        public static string partMerge { get => GetText("partMerge"); }
+    public static string saveName => GetText("saveName");
-        public static string fetch { get => GetText("fetch"); }
+    public static string taskStartAt => GetText("taskStartAt");
-        public static string ffmpegMerge { get => GetText("ffmpegMerge"); }
+    public static string namedPipeCreated => GetText("namedPipeCreated");
-        public static string ffmpegNotFound { get => GetText("ffmpegNotFound"); }
+    public static string namedPipeMux => GetText("namedPipeMux");
-        public static string fixingTTML { get => GetText("fixingTTML"); }
+    public static string partMerge => GetText("partMerge");
-        public static string fixingTTMLmp4 { get => GetText("fixingTTMLmp4"); }
+    public static string fetch => GetText("fetch");
-        public static string fixingVTT { get => GetText("fixingVTT"); }
+    public static string ffmpegMerge => GetText("ffmpegMerge");
-        public static string fixingVTTmp4 { get => GetText("fixingVTTmp4"); }
+    public static string ffmpegNotFound => GetText("ffmpegNotFound");
-        public static string keyProcessorNotFound { get => GetText("keyProcessorNotFound"); }
+    public static string mkvmergeNotFound => GetText("mkvmergeNotFound");
-        public static string liveFound { get => GetText("liveFound"); }
+    public static string mp4decryptNotFound => GetText("mp4decryptNotFound");
-        public static string loadingUrl { get => GetText("loadingUrl"); }
+    public static string shakaPackagerNotFound => GetText("shakaPackagerNotFound");
-        public static string masterM3u8Found { get => GetText("masterM3u8Found"); }
+    public static string fixingTTML => GetText("fixingTTML");
-        public static string matchDASH { get => GetText("matchDASH"); }
+    public static string fixingTTMLmp4 => GetText("fixingTTMLmp4");
-        public static string matchMSS { get => GetText("matchMSS"); }
+    public static string fixingVTT => GetText("fixingVTT");
-        public static string matchTS { get => GetText("matchTS"); }
+    public static string fixingVTTmp4 => GetText("fixingVTTmp4");
-        public static string matchHLS { get => GetText("matchHLS"); }
+    public static string keyProcessorNotFound => GetText("keyProcessorNotFound");
-        public static string notSupported { get => GetText("notSupported"); }
+    public static string liveFound => GetText("liveFound");
-        public static string parsingStream { get => GetText("parsingStream"); }
+    public static string loadingUrl => GetText("loadingUrl");
-        public static string promptChoiceText { get => GetText("promptChoiceText"); }
+    public static string masterM3u8Found => GetText("masterM3u8Found");
-        public static string promptInfo { get => GetText("promptInfo"); }
+    public static string allowHlsMultiExtMap => GetText("allowHlsMultiExtMap");
-        public static string promptTitle { get => GetText("promptTitle"); }
+    public static string matchDASH => GetText("matchDASH");
-        public static string readingInfo { get => GetText("readingInfo"); }
+    public static string matchMSS => GetText("matchMSS");
-        public static string searchKey { get => GetText("searchKey"); }
+    public static string matchTS => GetText("matchTS");
-        public static string segmentCountCheckNotPass { get => GetText("segmentCountCheckNotPass"); }
+    public static string matchHLS => GetText("matchHLS");
-        public static string selectedStream { get => GetText("selectedStream"); }
+    public static string notSupported => GetText("notSupported");
-        public static string startDownloading { get => GetText("startDownloading"); }
+    public static string parsingStream => GetText("parsingStream");
-        public static string streamsInfo { get => GetText("streamsInfo"); }
+    public static string promptChoiceText => GetText("promptChoiceText");
-        public static string writeJson { get => GetText("writeJson"); }
+    public static string promptInfo => GetText("promptInfo");
-        public static string noStreamsToDownload { get => GetText("noStreamsToDownload"); }
+    public static string promptTitle => GetText("promptTitle");
-        public static string newVersionFound { get => GetText("newVersionFound"); }
+    public static string readingInfo => GetText("readingInfo");
-        public static string processImageSub { get => GetText("processImageSub"); }
+    public static string searchKey => GetText("searchKey");
+    public static string decryptionFailed => GetText("decryptionFailed");
+    public static string segmentCountCheckNotPass => GetText("segmentCountCheckNotPass");
+    public static string selectedStream => GetText("selectedStream");
+    public static string startDownloading => GetText("startDownloading");
+    public static string streamsInfo => GetText("streamsInfo");
+    public static string writeJson => GetText("writeJson");
+    public static string noStreamsToDownload => GetText("noStreamsToDownload");
+    public static string newVersionFound => GetText("newVersionFound");
+    public static string processImageSub => GetText("processImageSub");
 
     private static string GetText(string key)
     {
-            if (!StaticText.LANG_DIC.ContainsKey(key))
+        if (!StaticText.LANG_DIC.TryGetValue(key, out var textObj))
             return "<...LANG TEXT MISSING...>";
 
-            var current = Thread.CurrentThread.CurrentUICulture.Name;
+        if (CurrentLoc is "zh-CN" or "zh-SG" or "zh-Hans")
-            if (current == "zh-CN" || current == "zh-SG" || current == "zh-Hans")
+            return textObj.ZH_CN;
-                return StaticText.LANG_DIC[key].ZH_CN;
+        return CurrentLoc.StartsWith("zh-") ? textObj.ZH_TW : textObj.EN_US;
-            else if (current.StartsWith("zh-"))
-                return StaticText.LANG_DIC[key].ZH_TW;
-            else
-                return StaticText.LANG_DIC[key].EN_US;
-        }
     }
 }

src/N_m3u8DL-RE.Common/Resource/StaticText.cs

@@ -1,14 +1,8 @@
-using System;
+namespace N_m3u8DL_RE.Common.Resource;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Resource
+internal static class StaticText
 {
-    internal class StaticText
+    public static readonly Dictionary<string, TextContainer> LANG_DIC = new()
-    {
-        public static Dictionary<string, TextContainer> LANG_DIC = new()
     {
         ["singleFileSplitWarn"] = new TextContainer
         (
@@ -172,6 +166,12 @@ namespace N_m3u8DL_RE.Common.Resource
             zhTW: "關閉日誌文件輸出",
             enUS: "Disable log file output"
         ),
+        ["cmd_allowHlsMultiExtMap"] = new TextContainer
+        (
+            zhCN: "允许HLS中的多个#EXT-X-MAP(实验性)",
+            zhTW: "允許HLS中的多個#EXT-X-MAP(實驗性)",
+            enUS: "Allow multiple #EXT-X-MAP in HLS (experimental)"
+        ),
         ["cmd_appendUrlParams"] = new TextContainer
         (
             zhCN: "将输入Url的Params添加至分片, 对某些网站很有用, 例如 kakao.com",
@@ -184,6 +184,12 @@ namespace N_m3u8DL_RE.Common.Resource
             zhTW: "自動選擇所有類型的最佳軌道",
             enUS: "Automatically selects the best tracks of all types"
         ),
+        ["cmd_disableUpdateCheck"] = new TextContainer
+        (
+            zhCN: "禁用版本更新检测",
+            zhTW: "禁用版本更新檢測",
+            enUS: "Disable version update check"
+        ),
         ["cmd_binaryMerge"] = new TextContainer
         (
             zhCN: "二进制合并",
@@ -208,11 +214,17 @@ namespace N_m3u8DL_RE.Common.Resource
             zhTW: "每個分片下載異常時的重試次數",
             enUS: "The number of retries when download segment error"
         ),
+        ["cmd_httpRequestTimeout"] = new TextContainer
+        (
+            zhCN: "HTTP请求的超时时间(秒)",
+            zhTW: "HTTP請求的超時時間(秒)",
+            enUS: "Timeout duration for HTTP requests (in seconds)"
+        ),
         ["cmd_decryptionBinaryPath"] = new TextContainer
         (
-                zhCN: "MP4解密所用工具的全路径, 例如 C:\\Tools\\mp4decrypt.exe",
+            zhCN: @"MP4解密所用工具的全路径, 例如 C:\Tools\mp4decrypt.exe",
-                zhTW: "MP4解密所用工具的全路徑, 例如 C:\\Tools\\mp4decrypt.exe",
+            zhTW: @"MP4解密所用工具的全路徑, 例如 C:\Tools\mp4decrypt.exe",
-                enUS: "Full path to the tool used for MP4 decryption, like C:\\Tools\\mp4decrypt.exe"
+            enUS: @"Full path to the tool used for MP4 decryption, like C:\Tools\mp4decrypt.exe"
         ),
         ["cmd_delAfterDone"] = new TextContainer
         (
@@ -222,15 +234,15 @@ namespace N_m3u8DL_RE.Common.Resource
         ),
         ["cmd_ffmpegBinaryPath"] = new TextContainer
         (
-                zhCN: "ffmpeg可执行程序全路径, 例如 C:\\Tools\\ffmpeg.exe",
+            zhCN: @"ffmpeg可执行程序全路径, 例如 C:\Tools\ffmpeg.exe",
-                zhTW: "ffmpeg可執行程序全路徑, 例如 C:\\Tools\\ffmpeg.exe",
+            zhTW: @"ffmpeg可執行程序全路徑, 例如 C:\Tools\ffmpeg.exe",
-                enUS: "Full path to the ffmpeg binary, like C:\\Tools\\ffmpeg.exe"
+            enUS: @"Full path to the ffmpeg binary, like C:\Tools\ffmpeg.exe"
         ),
         ["cmd_mkvmergeBinaryPath"] = new TextContainer
         (
-                zhCN: "mkvmerge可执行程序全路径, 例如 C:\\Tools\\mkvmerge.exe",
+            zhCN: @"mkvmerge可执行程序全路径, 例如 C:\Tools\mkvmerge.exe",
-                zhTW: "mkvmerge可執行程序全路徑, 例如 C:\\Tools\\mkvmerge.exe",
+            zhTW: @"mkvmerge可執行程序全路徑, 例如 C:\Tools\mkvmerge.exe",
-                enUS: "Full path to the mkvmerge binary, like C:\\Tools\\mkvmerge.exe"
+            enUS: @"Full path to the mkvmerge binary, like C:\Tools\mkvmerge.exe"
         ),
         ["cmd_liveFixVttByAudio"] = new TextContainer
         (
@@ -252,9 +264,9 @@ namespace N_m3u8DL_RE.Common.Resource
         ),
         ["cmd_keys"] = new TextContainer
         (
-                zhCN: "设置解密密钥, 程序调用mp4decrpyt/shaka-packager进行解密. 格式:\r\n--key KID1:KEY1 --key KID2:KEY2",
+            zhCN: "设置解密密钥, 程序调用mp4decrpyt/shaka-packager/ffmpeg进行解密. 格式:\r\n--key KID1:KEY1 --key KID2:KEY2\r\n对于KEY相同的情况可以直接输入 --key KEY",
-                zhTW: "設置解密密鑰, 程序調用mp4decrpyt/shaka-packager進行解密. 格式:\r\n--key KID1:KEY1 --key KID2:KEY2",
+            zhTW: "設置解密密鑰, 程序調用mp4decrpyt/shaka-packager/ffmpeg進行解密. 格式:\r\n--key KID1:KEY1 --key KID2:KEY2\r\n對於KEY相同的情況可以直接輸入 --key KEY",
-                enUS: "Pass decryption key(s) to mp4decrypt/shaka-packager. format:\r\n--key KID1:KEY1 --key KID2:KEY2"
+            enUS: "Set decryption key(s) to mp4decrypt/shaka-packager/ffmpeg. format:\r\n--key KID1:KEY1 --key KID2:KEY2\r\nor use --key KEY if all tracks share the same key."
         ),
         ["cmd_keyText"] = new TextContainer
         (
@@ -454,6 +466,12 @@ namespace N_m3u8DL_RE.Common.Resource
             zhTW: "解密時使用shaka-packager替代mp4decrypt",
             enUS: "Use shaka-packager instead of mp4decrypt to decrypt"
         ),
+        ["cmd_decryptionEngine"] = new TextContainer
+        (
+            zhCN: "设置解密时使用的第三方程序",
+            zhTW: "設置解密時使用的第三方程序",
+            enUS: "Set the third-party program used for decryption"
+        ),
         ["cmd_concurrentDownload"] = new TextContainer
         (
             zhCN: "并发下载已选择的音频、视频和字幕",
@@ -631,7 +649,7 @@ namespace N_m3u8DL_RE.Common.Resource
         ["cmd_muxAfterDone_more"] = new TextContainer
         (
             zhCN: "所有工作完成时尝试混流分离的音视频. 你能够以:分隔形式指定如下参数:\r\n\r\n" +
-                      "* format=FORMAT: 指定混流容器 mkv, mp4\r\n" +
+                  "* format=FORMAT: 指定混流容器 mkv, mp4, ts\r\n" +
                   "* muxer=MUXER: 指定混流程序 ffmpeg, mkvmerge (默认: ffmpeg)\r\n" +
                   "* bin_path=PATH: 指定程序路径 (默认: 自动寻找)\r\n" +
                   "* skip_sub=BOOL: 是否忽略字幕文件 (默认: false)\r\n" +
@@ -644,7 +662,7 @@ namespace N_m3u8DL_RE.Common.Resource
                   "# 使用mkvmerge, 自定义程序路径\r\n" +
                   "-M format=mkv:muxer=mkvmerge:bin_path=\"C\\:\\Program Files\\MKVToolNix\\mkvmerge.exe\"\r\n",
             zhTW: "所有工作完成時嘗試混流分離的影音. 你能夠以:分隔形式指定如下參數:\r\n\r\n" +
-                      "* format=FORMAT: 指定混流容器 mkv, mp4\r\n" +
+                  "* format=FORMAT: 指定混流容器 mkv, mp4, ts\r\n" +
                   "* muxer=MUXER: 指定混流程序 ffmpeg, mkvmerge (默認: ffmpeg)\r\n" +
                   "* bin_path=PATH: 指定程序路徑 (默認: 自動尋找)\r\n" +
                   "* skip_sub=BOOL: 是否忽略字幕文件 (默認: false)\r\n" +
@@ -657,7 +675,7 @@ namespace N_m3u8DL_RE.Common.Resource
                   "# 使用mkvmerge, 自訂程序路徑\r\n" +
                   "-M format=mkv:muxer=mkvmerge:bin_path=\"C\\:\\Program Files\\MKVToolNix\\mkvmerge.exe\"\r\n",
             enUS: "When all works is done, try to mux the downloaded streams. OPTIONS is a colon separated list of:\r\n\r\n" +
-                      "* format=FORMAT: set container. mkv, mp4\r\n" +
+                  "* format=FORMAT: set container. mkv, mp4, ts\r\n" +
                   "* muxer=MUXER: set muxer. ffmpeg, mkvmerge (Default: ffmpeg)\r\n" +
                   "* bin_path=PATH: set binary file path. (Default: auto)\r\n" +
                   "* skip_sub=BOOL: set whether or not skip subtitle files (Default: false)\r\n" +
@@ -726,9 +744,9 @@ namespace N_m3u8DL_RE.Common.Resource
         ),
         ["realTimeDecMessage"] = new TextContainer
         (
-                zhCN: "启用实时解密时，建议用shaka-packager而非mp4decrypt",
+            zhCN: "启用实时解密时，建议用shaka-packager而非mp4decrypt/ffmpeg",
-                zhTW: "啟用即時解密時，建議用shaka-packager而非mp4decrypt",
+            zhTW: "啟用即時解密時，建議用shaka-packager而非mp4decrypt/ffmpeg",
-                enUS: "When enabling real-time decryption, it is recommended to use shaka-packager instead of mp4decrypt"
+            enUS: "When enabling real-time decryption, it is recommended to use shaka-packager instead of mp4decrypt/ffmpeg"
         ),
         ["liveLimitReached"] = new TextContainer
         (
@@ -760,6 +778,24 @@ namespace N_m3u8DL_RE.Common.Resource
             zhTW: "找不到ffmpeg，請自行下載：https://ffmpeg.org/download.html",
             enUS: "ffmpeg not found, please download at: https://ffmpeg.org/download.html"
         ),
+        ["mkvmergeNotFound"] = new TextContainer
+        (
+            zhCN: "找不到mkvmerge，请自行下载：https://mkvtoolnix.download/downloads.html",
+            zhTW: "找不到mkvmerge，請自行下載：https://mkvtoolnix.download/downloads.html",
+            enUS: "mkvmerge not found, please download at: https://mkvtoolnix.download/downloads.html"
+        ),
+        ["shakaPackagerNotFound"] = new TextContainer
+        (
+            zhCN: "找不到shaka-packager，请自行下载：https://github.com/shaka-project/shaka-packager/releases",
+            zhTW: "找不到shaka-packager，請自行下載：https://github.com/shaka-project/shaka-packager/releases",
+            enUS: "shaka-packager not found, please download at: https://github.com/shaka-project/shaka-packager/releases"
+        ),
+        ["mp4decryptNotFound"] = new TextContainer
+        (
+            zhCN: "找不到mp4decrypt，请自行下载：https://www.bento4.com/downloads/",
+            zhTW: "找不到mp4decrypt，請自行下載：https://www.bento4.com/downloads/",
+            enUS: "mp4decrypt not found, please download at: https://www.bento4.com/downloads/"
+        ),
         ["fixingTTML"] = new TextContainer
         (
             zhCN: "正在提取TTML(raw)字幕...",
@@ -808,6 +844,12 @@ namespace N_m3u8DL_RE.Common.Resource
             zhTW: "檢測到Master列表，開始解析全部流訊息",
             enUS: "Master List detected, try parse all streams"
         ),
+        ["allowHlsMultiExtMap"] = new TextContainer
+        (
+            zhCN: "已经允许识别多个#EXT-X-MAP标签, 本软件可能无法正确处理, 请手动确认内容完整性",
+            zhTW: "已經允許識別多個#EXT-X-MAP標籤, 本軟件可能無法正確處理, 請手動確認內容完整性",
+            enUS: "Multiple #EXT-X-MAP tags are now allowed for detection. However, this software may not handle them correctly. Please manually verify the content's integrity"
+        ),
         ["matchTS"] = new TextContainer
         (
             zhCN: "内容匹配: [white on green3]HTTP Live MPEG2-TS[/]",
@@ -880,6 +922,12 @@ namespace N_m3u8DL_RE.Common.Resource
             zhTW: "正在嘗試從文本文件搜尋KEY...",
             enUS: "Trying to search for KEY from text file..."
         ),
+        ["decryptionFailed"] = new TextContainer
+        (
+            zhCN: "解密失败",
+            zhTW: "解密失敗",
+            enUS: "Decryption failed"
+        ),
         ["segmentCountCheckNotPass"] = new TextContainer
         (
             zhCN: "分片数量校验不通过, 共{}个,已下载{}.",
@@ -918,5 +966,4 @@ namespace N_m3u8DL_RE.Common.Resource
         ),
 
     };
-    }
 }

src/N_m3u8DL-RE.Common/Resource/TextContainer.cs

@@ -1,16 +1,10 @@
-using System;
+namespace N_m3u8DL_RE.Common.Resource;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Resource
+internal class TextContainer
 {
-    internal class TextContainer
+    public string ZH_CN { get; }
-    {
+    public string ZH_TW { get; }
-        public string ZH_CN { get; set; }
+    public string EN_US { get; }
-        public string ZH_TW { get; set; }
-        public string EN_US { get; set; }
 
     public TextContainer(string zhCN, string zhTW, string enUS)
     {
@@ -18,5 +12,4 @@ namespace N_m3u8DL_RE.Common.Resource
         ZH_TW = zhTW;
         EN_US = enUS;
     }
-    }
 }

src/N_m3u8DL-RE.Common/Util/GlobalUtil.cs

@@ -1,18 +1,13 @@
 using N_m3u8DL_RE.Common.Entity;
 using N_m3u8DL_RE.Common.JsonConverter;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 using System.Text.Json;
 using System.Text.Json.Serialization;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Util
+namespace N_m3u8DL_RE.Common.Util;
+
+public static class GlobalUtil
 {
-    public class GlobalUtil
+    private static readonly JsonSerializerOptions Options = new()
-    {
-        private static readonly JsonSerializerOptions Options = new JsonSerializerOptions
     {
         Encoder = System.Text.Encodings.Web.JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
         WriteIndented = true,
@@ -27,15 +22,15 @@ namespace N_m3u8DL_RE.Common.Util
         {
             return JsonSerializer.Serialize(s, Context.StreamSpec);
         }
-            else if (o is IOrderedEnumerable<StreamSpec> ss)
+        if (o is IOrderedEnumerable<StreamSpec> ss)
         {
             return JsonSerializer.Serialize(ss, Context.IOrderedEnumerableStreamSpec);
         }
-            else if (o is List<StreamSpec> sList)
+        if (o is List<StreamSpec> sList)
         {
             return JsonSerializer.Serialize(sList, Context.ListStreamSpec);
         }
-            else if (o is IEnumerable<MediaSegment> mList)
+        if (o is IEnumerable<MediaSegment> mList)
         {
             return JsonSerializer.Serialize(mList, Context.IEnumerableMediaSegment);
         }
@@ -47,14 +42,14 @@ namespace N_m3u8DL_RE.Common.Util
         return fileSize switch
         {
             < 0 => throw new ArgumentOutOfRangeException(nameof(fileSize)),
-                >= 1024 * 1024 * 1024 => string.Format("{0:########0.00}GB", (double)fileSize / (1024 * 1024 * 1024)),
+            >= 1024 * 1024 * 1024 => $"{fileSize / (1024 * 1024 * 1024):########0.00}GB",
-                >= 1024 * 1024 => string.Format("{0:####0.00}MB", (double)fileSize / (1024 * 1024)),
+            >= 1024 * 1024 => $"{fileSize / (1024 * 1024):####0.00}MB",
-                >= 1024 => string.Format("{0:####0.00}KB", (double)fileSize / 1024),
+            >= 1024 => $"{fileSize / 1024:####0.00}KB",
-                _ => string.Format("{0:####0.00}B", fileSize)
+            _ => $"{fileSize:####0.00}B"
         };
     }
 
-        //此函数用于格式化输出时长  
+    // 此函数用于格式化输出时长  
     public static string FormatTime(int time)
     {
         TimeSpan ts = new TimeSpan(0, 0, time);
@@ -72,9 +67,7 @@ namespace N_m3u8DL_RE.Common.Util
     {
         var fileExt = OperatingSystem.IsWindows() ? ".exe" : "";
         var searchPath = new[] { Environment.CurrentDirectory, Path.GetDirectoryName(Environment.ProcessPath) };
-            var envPath = Environment.GetEnvironmentVariable("PATH")?.Split(Path.PathSeparator) ??
+        var envPath = Environment.GetEnvironmentVariable("PATH")?.Split(Path.PathSeparator) ?? [];
-                          Array.Empty<string>();
+        return searchPath.Concat(envPath).Select(p => Path.Combine(p!, name + fileExt)).FirstOrDefault(File.Exists);
-            return searchPath.Concat(envPath).Select(p => Path.Combine(p, name + fileExt)).FirstOrDefault(File.Exists);
-        }
     }
 }

src/N_m3u8DL-RE.Common/Util/HTTPUtil.cs

@@ -3,10 +3,10 @@ using System.Net.Http.Headers;
 using N_m3u8DL_RE.Common.Log;
 using N_m3u8DL_RE.Common.Resource;
 
-namespace N_m3u8DL_RE.Common.Util
+namespace N_m3u8DL_RE.Common.Util;
+
+public static class HTTPUtil
 {
-    public class HTTPUtil
-    {
     public static readonly HttpClientHandler HttpClientHandler = new()
     {
         AllowAutoRedirect = false,
@@ -37,13 +37,13 @@ namespace N_m3u8DL_RE.Common.Util
             }
         }
         Logger.Debug(webRequest.Headers.ToString());
-            //手动处理跳转，以免自定义Headers丢失
+        // 手动处理跳转，以免自定义Headers丢失
         var webResponse = await AppHttpClient.SendAsync(webRequest, HttpCompletionOption.ResponseHeadersRead);
         if (((int)webResponse.StatusCode).ToString().StartsWith("30"))
         {
             HttpResponseHeaders respHeaders = webResponse.Headers;
             Logger.Debug(respHeaders.ToString());
-                if (respHeaders != null && respHeaders.Location != null)
+            if (respHeaders.Location != null)
             {
                 var redirectedUrl = "";
                 if (!respHeaders.Location.IsAbsoluteUri)
@@ -64,7 +64,7 @@ namespace N_m3u8DL_RE.Common.Util
                 }
             }
         }
-            //手动将跳转后的URL设置进去, 用于后续取用
+        // 手动将跳转后的URL设置进去, 用于后续取用
         webResponse.Headers.Location = new Uri(url);
         webResponse.EnsureSuccessStatusCode();
         return webResponse;
@@ -76,9 +76,8 @@ namespace N_m3u8DL_RE.Common.Util
         {
             return await File.ReadAllBytesAsync(new Uri(url).LocalPath);
         }
-            byte[] bytes = new byte[0];
         var webResponse = await DoGetAsync(url, headers);
-            bytes = await webResponse.Content.ReadAsByteArrayAsync();
+        var bytes = await webResponse.Content.ReadAsByteArrayAsync();
         Logger.Debug(HexUtil.BytesToHex(bytes, " "));
         return bytes;
     }
@@ -91,9 +90,8 @@ namespace N_m3u8DL_RE.Common.Util
     /// <returns></returns>
     public static async Task<string> GetWebSourceAsync(string url, Dictionary<string, string>? headers = null)
     {
-            string htmlCode = string.Empty;
         var webResponse = await DoGetAsync(url, headers);
-            htmlCode = await webResponse.Content.ReadAsStringAsync();
+        string htmlCode = await webResponse.Content.ReadAsStringAsync();
         Logger.Debug(htmlCode);
         return htmlCode;
     }
@@ -101,7 +99,7 @@ namespace N_m3u8DL_RE.Common.Util
     private static bool CheckMPEG2TS(HttpResponseMessage? webResponse)
     {
         var mediaType = webResponse?.Content.Headers.ContentType?.MediaType?.ToLower();
-            return mediaType == "video/ts" || mediaType == "video/mp2t" || mediaType == "video/mpeg";
+        return mediaType is "video/ts" or "video/mp2t" or "video/mpeg";
     }
 
     /// <summary>
@@ -112,7 +110,7 @@ namespace N_m3u8DL_RE.Common.Util
     /// <returns>(Source Code, RedirectedUrl)</returns>
     public static async Task<(string, string)> GetWebSourceAndNewUrlAsync(string url, Dictionary<string, string>? headers = null)
     {
-            string htmlCode = string.Empty;
+        string htmlCode;
         var webResponse = await DoGetAsync(url, headers);
         if (CheckMPEG2TS(webResponse))
         {
@@ -128,7 +126,7 @@ namespace N_m3u8DL_RE.Common.Util
 
     public static async Task<string> GetPostResponseAsync(string Url, byte[] postData)
     {
-            string htmlCode = string.Empty;
+        string htmlCode;
         using HttpRequestMessage request = new(HttpMethod.Post, Url);
         request.Headers.TryAddWithoutValidation("Content-Type", "application/json");
         request.Headers.TryAddWithoutValidation("Content-Length", postData.Length.ToString());
@@ -137,5 +135,4 @@ namespace N_m3u8DL_RE.Common.Util
         htmlCode = await webResponse.Content.ReadAsStringAsync();
         return htmlCode;
     }
-    }
 }

src/N_m3u8DL-RE.Common/Util/HexUtil.cs

@@ -1,13 +1,7 @@
-using System;
+namespace N_m3u8DL_RE.Common.Util;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Common.Util
+public static class HexUtil
 {
-    public class HexUtil
-    {
     public static string BytesToHex(byte[] data, string split = "")
     {
         return BitConverter.ToString(data).Replace("-", split);
@@ -34,15 +28,12 @@ namespace N_m3u8DL_RE.Common.Util
 
     public static byte[] HexToBytes(string hex)
     {
-            hex = hex.Trim();
+        var hexSpan = hex.AsSpan().Trim();
-            if (hex.StartsWith("0x") || hex.StartsWith("0X"))
+        if (hexSpan.StartsWith("0x") || hexSpan.StartsWith("0X"))
-                hex = hex.Substring(2);
+        {
-            byte[] bytes = new byte[hex.Length / 2];
+            hexSpan = hexSpan[2..];
-
-            for (int i = 0; i < hex.Length; i += 2)
-                bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
-
-            return bytes;
         }
+
+        return Convert.FromHexString(hexSpan);
     }
 }

src/N_m3u8DL-RE.Common/Util/RetryUtil.cs

@@ -4,7 +4,7 @@ using Spectre.Console;
 
 namespace N_m3u8DL_RE.Common.Util;
 
-public class RetryUtil
+public static class RetryUtil
 {
     public static async Task<T?> WebRequestRetryAsync<T>(Func<Task<T>> funcAsync, int maxRetries = 10, int retryDelayMilliseconds = 1500, int retryDelayIncrementMilliseconds = 0)
     {

src/N_m3u8DL-RE.Parser/Config/ParserConfig.cs

@@ -3,17 +3,19 @@ using N_m3u8DL_RE.Parser.Processor;
 using N_m3u8DL_RE.Parser.Processor.DASH;
 using N_m3u8DL_RE.Parser.Processor.HLS;
 
-namespace N_m3u8DL_RE.Parser.Config
+namespace N_m3u8DL_RE.Parser.Config;
+
+public class ParserConfig
 {
-    public class ParserConfig
+    public string Url { get; set; } = string.Empty;
-    {
-        public string Url { get; set; }
 
-        public string OriginalUrl { get; set; }
+    public string OriginalUrl { get; set; } = string.Empty;
 
-        public string BaseUrl { get; set; }
+    public string BaseUrl { get; set; } = string.Empty;
     
-        public Dictionary<string, string> Headers { get; set; } = new Dictionary<string, string>();
+    public Dictionary<string, string> CustomParserArgs { get; } = new();
+
+    public Dictionary<string, string> Headers { get; init; } = new();
 
     /// <summary>
     /// 内容前置处理器. 调用顺序与列表顺序相同
@@ -64,5 +66,4 @@ namespace N_m3u8DL_RE.Parser.Config
     /// KEY重试次数
     /// </summary>
     public int KeyRetryCount { get; set; } = 3;
-    }
 }

src/N_m3u8DL-RE.Parser/Constants/DASHTags.cs

@@ -1,16 +1,9 @@
-using System;
+namespace N_m3u8DL_RE.Parser.Constants;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Parser.Constants
+internal static class DASHTags
 {
-    internal class DASHTags
+    public const string TemplateRepresentationID = "$RepresentationID$";
-    {
+    public const string TemplateBandwidth = "$Bandwidth$";
-        public static string TemplateRepresentationID = "$RepresentationID$";
+    public const string TemplateNumber = "$Number$";
-        public static string TemplateBandwidth = "$Bandwidth$";
+    public const string TemplateTime = "$Time$";
-        public static string TemplateNumber = "$Number$";
-        public static string TemplateTime = "$Time$";
-    }
 }

src/N_m3u8DL-RE.Parser/Constants/HLSTags.cs

@@ -1,38 +1,31 @@
-using System;
+namespace N_m3u8DL_RE.Parser.Constants;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Parser.Constants
+internal static class HLSTags
 {
-    internal class HLSTags
+    public const string ext_m3u = "#EXTM3U";
-    {
+    public const string ext_x_targetduration = "#EXT-X-TARGETDURATION";
-        public static string ext_m3u = "#EXTM3U";
+    public const string ext_x_media_sequence = "#EXT-X-MEDIA-SEQUENCE";
-        public static string ext_x_targetduration = "#EXT-X-TARGETDURATION";
+    public const string ext_x_discontinuity_sequence = "#EXT-X-DISCONTINUITY-SEQUENCE";
-        public static string ext_x_media_sequence = "#EXT-X-MEDIA-SEQUENCE";
+    public const string ext_x_program_date_time = "#EXT-X-PROGRAM-DATE-TIME";
-        public static string ext_x_discontinuity_sequence = "#EXT-X-DISCONTINUITY-SEQUENCE";
+    public const string ext_x_media = "#EXT-X-MEDIA";
-        public static string ext_x_program_date_time = "#EXT-X-PROGRAM-DATE-TIME";
+    public const string ext_x_playlist_type = "#EXT-X-PLAYLIST-TYPE";
-        public static string ext_x_media = "#EXT-X-MEDIA";
+    public const string ext_x_key = "#EXT-X-KEY";
-        public static string ext_x_playlist_type = "#EXT-X-PLAYLIST-TYPE";
+    public const string ext_x_stream_inf = "#EXT-X-STREAM-INF";
-        public static string ext_x_key = "#EXT-X-KEY";
+    public const string ext_x_version = "#EXT-X-VERSION";
-        public static string ext_x_stream_inf = "#EXT-X-STREAM-INF";
+    public const string ext_x_allow_cache = "#EXT-X-ALLOW-CACHE";
-        public static string ext_x_version = "#EXT-X-VERSION";
+    public const string ext_x_endlist = "#EXT-X-ENDLIST";
-        public static string ext_x_allow_cache = "#EXT-X-ALLOW-CACHE";
+    public const string extinf = "#EXTINF";
-        public static string ext_x_endlist = "#EXT-X-ENDLIST";
+    public const string ext_i_frames_only = "#EXT-X-I-FRAMES-ONLY";
-        public static string extinf = "#EXTINF";
+    public const string ext_x_byterange = "#EXT-X-BYTERANGE";
-        public static string ext_i_frames_only = "#EXT-X-I-FRAMES-ONLY";
+    public const string ext_x_i_frame_stream_inf = "#EXT-X-I-FRAME-STREAM-INF";
-        public static string ext_x_byterange = "#EXT-X-BYTERANGE";
+    public const string ext_x_discontinuity = "#EXT-X-DISCONTINUITY";
-        public static string ext_x_i_frame_stream_inf = "#EXT-X-I-FRAME-STREAM-INF";
+    public const string ext_x_cue_out_start = "#EXT-X-CUE-OUT";
-        public static string ext_x_discontinuity = "#EXT-X-DISCONTINUITY";
+    public const string ext_x_cue_out = "#EXT-X-CUE-OUT-CONT";
-        public static string ext_x_cue_out_start = "#EXT-X-CUE-OUT";
+    public const string ext_is_independent_segments = "#EXT-X-INDEPENDENT-SEGMENTS";
-        public static string ext_x_cue_out = "#EXT-X-CUE-OUT-CONT";
+    public const string ext_x_scte35 = "#EXT-OATCLS-SCTE35";
-        public static string ext_is_independent_segments = "#EXT-X-INDEPENDENT-SEGMENTS";
+    public const string ext_x_cue_start = "#EXT-X-CUE-OUT";
-        public static string ext_x_scte35 = "#EXT-OATCLS-SCTE35";
+    public const string ext_x_cue_end = "#EXT-X-CUE-IN";
-        public static string ext_x_cue_start = "#EXT-X-CUE-OUT";
+    public const string ext_x_cue_span = "#EXT-X-CUE-SPAN";
-        public static string ext_x_cue_end = "#EXT-X-CUE-IN";
+    public const string ext_x_map = "#EXT-X-MAP";
-        public static string ext_x_cue_span = "#EXT-X-CUE-SPAN";
+    public const string ext_x_start = "#EXT-X-START";
-        public static string ext_x_map = "#EXT-X-MAP";
-        public static string ext_x_start = "#EXT-X-START";
-    }
 }

src/N_m3u8DL-RE.Parser/Constants/MSSTags.cs

@@ -1,16 +1,9 @@
-using System;
+namespace N_m3u8DL_RE.Parser.Constants;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Parser.Constants
+internal static class MSSTags
 {
-    internal class MSSTags
+    public const string Bitrate = "{Bitrate}";
-    {
+    public const string Bitrate_BK = "{bitrate}";
-        public static string Bitrate = "{Bitrate}";
+    public const string StartTime = "{start_time}";
-        public static string Bitrate_BK = "{bitrate}";
+    public const string StartTime_BK = "{start time}";
-        public static string StartTime = "{start_time}";
-        public static string StartTime_BK = "{start time}";
-    }
 }

src/N_m3u8DL-RE.Parser/Extractor/DASHExtractor2.cs

@@ -4,20 +4,15 @@ using N_m3u8DL_RE.Common.Util;
 using N_m3u8DL_RE.Parser.Config;
 using N_m3u8DL_RE.Parser.Constants;
 using N_m3u8DL_RE.Parser.Util;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 using System.Text.RegularExpressions;
-using System.Threading.Tasks;
 using System.Xml;
 using System.Xml.Linq;
 
-namespace N_m3u8DL_RE.Parser.Extractor
+namespace N_m3u8DL_RE.Parser.Extractor;
+
+// https://blog.csdn.net/leek5533/article/details/117750191
+internal partial class DASHExtractor2 : IExtractor
 {
-    //https://blog.csdn.net/leek5533/article/details/117750191
-    internal class DASHExtractor2 : IExtractor
-    {
     private static EncryptMethod DEFAULT_METHOD = EncryptMethod.CENC;
 
     public ExtractorType ExtractorType => ExtractorType.MPEG_DASH;
@@ -37,15 +32,12 @@ namespace N_m3u8DL_RE.Parser.Extractor
     private void SetInitUrl()
     {
         this.MpdUrl = ParserConfig.Url ?? string.Empty;
-            if (!string.IsNullOrEmpty(ParserConfig.BaseUrl))
+        this.BaseUrl = !string.IsNullOrEmpty(ParserConfig.BaseUrl) ? ParserConfig.BaseUrl : this.MpdUrl;
-                this.BaseUrl = ParserConfig.BaseUrl;
-            else
-                this.BaseUrl = this.MpdUrl;
     }
 
     private string ExtendBaseUrl(XElement element, string oriBaseUrl)
     {
-            var target = element.Elements().Where(e => e.Name.LocalName == "BaseURL").FirstOrDefault();
+        var target = element.Elements().FirstOrDefault(e => e.Name.LocalName == "BaseURL");
         if (target != null)
         {
             oriBaseUrl = ParserUtil.CombineURL(oriBaseUrl, target.Value);
@@ -57,16 +49,14 @@ namespace N_m3u8DL_RE.Parser.Extractor
     private double? GetFrameRate(XElement element)
     {
         var frameRate = element.Attribute("frameRate")?.Value;
-            if (frameRate != null && frameRate.Contains("/"))
+        if (frameRate == null || !frameRate.Contains('/')) return null;
-            {
+        
         var d = Convert.ToDouble(frameRate.Split('/')[0]) / Convert.ToDouble(frameRate.Split('/')[1]);
         frameRate = d.ToString("0.000");
         return Convert.ToDouble(frameRate);
     }
-            return null;
-        }
 
-        public async Task<List<StreamSpec>> ExtractStreamsAsync(string rawText)
+    public Task<List<StreamSpec>> ExtractStreamsAsync(string rawText)
     {
         var streamList = new List<StreamSpec>();
 
@@ -76,31 +66,31 @@ namespace N_m3u8DL_RE.Parser.Extractor
 
         var xmlDocument = XDocument.Parse(MpdContent);
 
-            //选中第一个MPD节点
+        // 选中第一个MPD节点
         var mpdElement = xmlDocument.Elements().First(e => e.Name.LocalName == "MPD");
 
-            //类型 static点播, dynamic直播
+        // 类型 static点播, dynamic直播
         var type = mpdElement.Attribute("type")?.Value;
         bool isLive = type == "dynamic";
 
-            //分片最大时长
+        // 分片最大时长
         var maxSegmentDuration = mpdElement.Attribute("maxSegmentDuration")?.Value;
-            //分片从该时间起可用
+        // 分片从该时间起可用
         var availabilityStartTime = mpdElement.Attribute("availabilityStartTime")?.Value;
-            //在availabilityStartTime的前XX段时间，分片有效
+        // 在availabilityStartTime的前XX段时间，分片有效
         var timeShiftBufferDepth = mpdElement.Attribute("timeShiftBufferDepth")?.Value;
         if (string.IsNullOrEmpty(timeShiftBufferDepth))
         {
-                //如果没有 默认一分钟有效
+            // 如果没有 默认一分钟有效
             timeShiftBufferDepth = "PT1M";
         }
-            //MPD发布时间
+        // MPD发布时间
         var publishTime = mpdElement.Attribute("publishTime")?.Value;
-            //MPD总时长
+        // MPD总时长
         var mediaPresentationDuration = mpdElement.Attribute("mediaPresentationDuration")?.Value;
 
-            //读取在MPD开头定义的<BaseURL>，并替换本身的URL
+        // 读取在MPD开头定义的<BaseURL>，并替换本身的URL
-            var baseUrlElement = mpdElement.Elements().Where(e => e.Name.LocalName == "BaseURL").FirstOrDefault();
+        var baseUrlElement = mpdElement.Elements().FirstOrDefault(e => e.Name.LocalName == "BaseURL");
         if (baseUrlElement != null)
         {
             var baseUrl = baseUrlElement.Value;
@@ -108,40 +98,40 @@ namespace N_m3u8DL_RE.Parser.Extractor
             this.BaseUrl = ParserUtil.CombineURL(this.MpdUrl, baseUrl);
         }
 
-            //全部Period
+        // 全部Period
         var periods = mpdElement.Elements().Where(e => e.Name.LocalName == "Period");
         foreach (var period in periods)
         {
-                //本Period时长
+            // 本Period时长
             var periodDuration = period.Attribute("duration")?.Value;
 
-                //本Period ID
+            // 本Period ID
             var periodId = period.Attribute("id")?.Value;
 
-                //最终分片会使用的baseurl
+            // 最终分片会使用的baseurl
             var segBaseUrl = this.BaseUrl;
 
-                //处理baseurl嵌套
+            // 处理baseurl嵌套
             segBaseUrl = ExtendBaseUrl(period, segBaseUrl);
 
             var adaptationSetsBaseUrl = segBaseUrl;
 
-                //本Period中的全部AdaptationSet
+            // 本Period中的全部AdaptationSet
             var adaptationSets = period.Elements().Where(e => e.Name.LocalName == "AdaptationSet");
             foreach (var adaptationSet in adaptationSets)
             {
-                    //处理baseurl嵌套
+                // 处理baseurl嵌套
                 segBaseUrl = ExtendBaseUrl(adaptationSet, segBaseUrl);
 
                 var representationsBaseUrl = segBaseUrl;
 
                 var mimeType = adaptationSet.Attribute("contentType")?.Value ?? adaptationSet.Attribute("mimeType")?.Value;
                 var frameRate = GetFrameRate(adaptationSet);
-                    //本AdaptationSet中的全部Representation
+                // 本AdaptationSet中的全部Representation
                 var representations = adaptationSet.Elements().Where(e => e.Name.LocalName == "Representation");
                 foreach (var representation in representations)
                 {
-                        //处理baseurl嵌套
+                    // 处理baseurl嵌套
                     segBaseUrl = ExtendBaseUrl(representation, segBaseUrl);
 
                     if (mimeType == null)
@@ -167,29 +157,29 @@ namespace N_m3u8DL_RE.Parser.Extractor
                         "audio" => MediaType.AUDIO,
                         _ => null
                     };
-                        //特殊处理
+                    // 特殊处理
                     if (representation.Attribute("volumeAdjust") != null)
                     {
                         streamSpec.GroupId += "-" + representation.Attribute("volumeAdjust")?.Value;
                     }
-                        //推测后缀名
+                    // 推测后缀名
                     var mType = representation.Attribute("mimeType")?.Value ?? adaptationSet.Attribute("mimeType")?.Value;
                     if (mType != null)
                     {
                         var mTypeSplit = mType.Split('/');
                         streamSpec.Extension = mTypeSplit.Length == 2 ? mTypeSplit[1] : null;
                     }
-                        //优化字幕场景识别
+                    // 优化字幕场景识别
-                        if (streamSpec.Codecs == "stpp" || streamSpec.Codecs == "wvtt")
+                    if (streamSpec.Codecs is "stpp" or "wvtt")
                     {
                         streamSpec.MediaType = MediaType.SUBTITLES;
                     }
-                        //优化字幕场景识别
+                    // 优化字幕场景识别
-                        var role = representation.Elements().Where(e => e.Name.LocalName == "Role").FirstOrDefault() ?? adaptationSet.Elements().Where(e => e.Name.LocalName == "Role").FirstOrDefault();
+                    var role = representation.Elements().FirstOrDefault(e => e.Name.LocalName == "Role") ?? adaptationSet.Elements().FirstOrDefault(e => e.Name.LocalName == "Role");
                     if (role != null)
                     {
-                            var v = role.Attribute("value")?.Value;
+                        var roleValue = role.Attribute("value")?.Value;
-                            if (Enum.TryParse(v, true, out RoleType roleType))
+                        if (Enum.TryParse(roleValue, true, out RoleType roleType))
                         {
                             streamSpec.Role = roleType;
 
@@ -200,34 +190,49 @@ namespace N_m3u8DL_RE.Parser.Extractor
                                     streamSpec.Extension = "ttml";
                             }
                         }
+                        else if (roleValue != null && roleValue.Contains('-'))
+                        {
+                            roleValue = roleValue.Replace("-", "");
+                            if (Enum.TryParse(roleValue, true, out RoleType roleType_))
+                            {
+                                streamSpec.Role = roleType_;
+
+                                if (roleType_ == RoleType.ForcedSubtitle)
+                                {
+                                    streamSpec.MediaType = MediaType.SUBTITLES; // or maybe MediaType.CLOSED_CAPTIONS?
+                                    if (mType != null && mType.Contains("ttml"))
+                                        streamSpec.Extension = "ttml";
+                                }
+                            }
+                        }
                     }
                     streamSpec.Playlist.IsLive = isLive;
-                        //设置刷新间隔 timeShiftBufferDepth / 2
+                    // 设置刷新间隔 timeShiftBufferDepth / 2
                     if (timeShiftBufferDepth != null)
                     {
                         streamSpec.Playlist.RefreshIntervalMs = XmlConvert.ToTimeSpan(timeShiftBufferDepth).TotalMilliseconds / 2;
                     }
 
-                        //读取声道数量
+                    // 读取声道数量
-                        var audioChannelConfiguration = adaptationSet.Elements().Concat(representation.Elements()).Where(e => e.Name.LocalName == "AudioChannelConfiguration").FirstOrDefault();
+                    var audioChannelConfiguration = adaptationSet.Elements().Concat(representation.Elements()).FirstOrDefault(e => e.Name.LocalName == "AudioChannelConfiguration");
                     if (audioChannelConfiguration != null)
                     {
                         streamSpec.Channels = audioChannelConfiguration.Attribute("value")?.Value;
                     }
 
-                        //发布时间
+                    // 发布时间
                     if (!string.IsNullOrEmpty(publishTime))
                     {
                         streamSpec.PublishTime = DateTime.Parse(publishTime);
                     }
 
 
-                        //第一种形式 SegmentBase
+                    // 第一种形式 SegmentBase
-                        var segmentBaseElement = representation.Elements().Where(e => e.Name.LocalName == "SegmentBase").FirstOrDefault();
+                    var segmentBaseElement = representation.Elements().FirstOrDefault(e => e.Name.LocalName == "SegmentBase");
                     if (segmentBaseElement != null)
                     {
-                            //处理init url
+                        // 处理init url
-                            var initialization = segmentBaseElement.Elements().Where(e => e.Name.LocalName == "Initialization").FirstOrDefault();
+                        var initialization = segmentBaseElement.Elements().FirstOrDefault(e => e.Name.LocalName == "Initialization");
                         if (initialization != null)
                         {
                             var sourceURL = initialization.Attribute("sourceURL")?.Value;
@@ -248,7 +253,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
                                 var initUrl = ParserUtil.CombineURL(segBaseUrl, initialization.Attribute("sourceURL")?.Value!);
                                 var initRange = initialization.Attribute("range")?.Value;
                                 streamSpec.Playlist.MediaInit = new MediaSegment();
-                                    streamSpec.Playlist.MediaInit.Index = -1; //便于排序
+                                streamSpec.Playlist.MediaInit.Index = -1; // 便于排序
                                 streamSpec.Playlist.MediaInit.Url = initUrl;
                                 if (initRange != null)
                                 {
@@ -260,19 +265,19 @@ namespace N_m3u8DL_RE.Parser.Extractor
                         }
                     }
 
-                        //第二种形式 SegmentList.SegmentList
+                    // 第二种形式 SegmentList.SegmentList
-                        var segmentList = representation.Elements().Where(e => e.Name.LocalName == "SegmentList").FirstOrDefault();
+                    var segmentList = representation.Elements().FirstOrDefault(e => e.Name.LocalName == "SegmentList");
                     if (segmentList != null)
                     {
                         var durationStr = segmentList.Attribute("duration")?.Value;
-                            //处理init url
+                        // 处理init url
-                            var initialization = segmentList.Elements().Where(e => e.Name.LocalName == "Initialization").FirstOrDefault();
+                        var initialization = segmentList.Elements().FirstOrDefault(e => e.Name.LocalName == "Initialization");
                         if (initialization != null)
                         {
                             var initUrl = ParserUtil.CombineURL(segBaseUrl, initialization.Attribute("sourceURL")?.Value!);
                             var initRange = initialization.Attribute("range")?.Value;
                             streamSpec.Playlist.MediaInit = new MediaSegment();
-                                streamSpec.Playlist.MediaInit.Index = -1; //便于排序
+                            streamSpec.Playlist.MediaInit.Index = -1; // 便于排序
                             streamSpec.Playlist.MediaInit.Url = initUrl;
                             if (initRange != null)
                             {
@@ -281,10 +286,10 @@ namespace N_m3u8DL_RE.Parser.Extractor
                                 streamSpec.Playlist.MediaInit.ExpectLength = expect;
                             }
                         }
-                            //处理分片
+                        // 处理分片
-                            var segmentURLs = segmentList.Elements().Where(e => e.Name.LocalName == "SegmentURL");
+                        var segmentURLs = segmentList.Elements().Where(e => e.Name.LocalName == "SegmentURL").ToList();
                         var timescaleStr = segmentList.Attribute("timescale")?.Value ?? "1";
-                            for (int segmentIndex = 0; segmentIndex < segmentURLs.Count(); segmentIndex++)
+                        for (int segmentIndex = 0; segmentIndex < segmentURLs.Count; segmentIndex++)
                         {
                             var segmentURL = segmentURLs.ElementAt(segmentIndex);
                             var mediaUrl = ParserUtil.CombineURL(segBaseUrl, segmentURL.Attribute("media")?.Value!);
@@ -305,50 +310,50 @@ namespace N_m3u8DL_RE.Parser.Extractor
                         }
                     }
 
-                        //第三种形式 SegmentTemplate+SegmentTimeline
+                    // 第三种形式 SegmentTemplate+SegmentTimeline
-                        //通配符有$RepresentationID$ $Bandwidth$ $Number$ $Time$
+                    // 通配符有$RepresentationID$ $Bandwidth$ $Number$ $Time$
 
-                        //adaptationSets中的segmentTemplate
+                    // adaptationSets中的segmentTemplate
                     var segmentTemplateElementsOuter = adaptationSet.Elements().Where(e => e.Name.LocalName == "SegmentTemplate");
-                        //representation中的segmentTemplate
+                    // representation中的segmentTemplate
                     var segmentTemplateElements = representation.Elements().Where(e => e.Name.LocalName == "SegmentTemplate");
                     if (segmentTemplateElements.Any() || segmentTemplateElementsOuter.Any())
                     {
-                            //优先使用最近的元素
+                        // 优先使用最近的元素
                         var segmentTemplate = (segmentTemplateElements.FirstOrDefault() ?? segmentTemplateElementsOuter.FirstOrDefault())!;
                         var segmentTemplateOuter = (segmentTemplateElementsOuter.FirstOrDefault() ?? segmentTemplateElements.FirstOrDefault())!;
                         var varDic = new Dictionary<string, object?>();
                         varDic[DASHTags.TemplateRepresentationID] = streamSpec.GroupId;
                         varDic[DASHTags.TemplateBandwidth] = bandwidth?.Value;
-                            //presentationTimeOffset
+                        // presentationTimeOffset
                         var presentationTimeOffsetStr = segmentTemplate.Attribute("presentationTimeOffset")?.Value ?? segmentTemplateOuter.Attribute("presentationTimeOffset")?.Value ?? "0";
-                            //timesacle
+                        // timesacle
                         var timescaleStr = segmentTemplate.Attribute("timescale")?.Value ?? segmentTemplateOuter.Attribute("timescale")?.Value ?? "1";
                         var durationStr = segmentTemplate.Attribute("duration")?.Value ?? segmentTemplateOuter.Attribute("duration")?.Value;
                         var startNumberStr = segmentTemplate.Attribute("startNumber")?.Value ?? segmentTemplateOuter.Attribute("startNumber")?.Value ?? "1";
-                            //处理init url
+                        // 处理init url
                         var initialization = segmentTemplate.Attribute("initialization")?.Value ?? segmentTemplateOuter.Attribute("initialization")?.Value;
                         if (initialization != null)
                         {
                             var _init = ParserUtil.ReplaceVars(initialization, varDic);
                             var initUrl = ParserUtil.CombineURL(segBaseUrl, _init);
                             streamSpec.Playlist.MediaInit = new MediaSegment();
-                                streamSpec.Playlist.MediaInit.Index = -1; //便于排序
+                            streamSpec.Playlist.MediaInit.Index = -1; // 便于排序
                             streamSpec.Playlist.MediaInit.Url = initUrl;
                         }
-                            //处理分片
+                        // 处理分片
                         var mediaTemplate = segmentTemplate.Attribute("media")?.Value ?? segmentTemplateOuter.Attribute("media")?.Value;
-                            var segmentTimeline = segmentTemplate.Elements().Where(e => e.Name.LocalName == "SegmentTimeline").FirstOrDefault();
+                        var segmentTimeline = segmentTemplate.Elements().FirstOrDefault(e => e.Name.LocalName == "SegmentTimeline");
                         if (segmentTimeline != null)
                         {
-                                //使用了SegmentTimeline 结果精确
+                            // 使用了SegmentTimeline 结果精确
                             var segNumber = Convert.ToInt64(startNumberStr);
                             var Ss = segmentTimeline.Elements().Where(e => e.Name.LocalName == "S");
                             var currentTime = 0L;
                             var segIndex = 0;
                             foreach (var S in Ss)
                             {
-                                    //每个S元素包含三个属性:@t(start time)\@r(repeat count)\@d(duration)
+                                // 每个S元素包含三个属性:@t(start time)\@r(repeat count)\@d(duration)
                                 var _startTimeStr = S.Attribute("t")?.Value;
                                 var _durationStr = S.Attribute("d")?.Value;
                                 var _repeatCountStr = S.Attribute("r")?.Value;
@@ -371,7 +376,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
                                 streamSpec.Playlist.MediaParts[0].MediaSegments.Add(mediaSegment);
                                 if (_repeatCount < 0)
                                 {
-                                        //负数表示一直重复 直到period结束 注意减掉已经加入的1个片段
+                                    // 负数表示一直重复 直到period结束 注意减掉已经加入的1个片段
                                     _repeatCount = (long)Math.Ceiling(XmlConvert.ToTimeSpan(periodDuration ?? mediaPresentationDuration ?? "PT0S").TotalSeconds * timescale / _duration) - 1;
                                 }
                                 for (long i = 0; i < _repeatCount; i++)
@@ -395,22 +400,22 @@ namespace N_m3u8DL_RE.Parser.Extractor
                         }
                         else
                         {
-                                //没用SegmentTimeline 需要计算总分片数量 不精确
+                            // 没用SegmentTimeline 需要计算总分片数量 不精确
                             var timescale = Convert.ToInt32(timescaleStr);
                             var startNumber = Convert.ToInt64(startNumberStr);
                             var duration = Convert.ToInt32(durationStr);
                             var totalNumber = (long)Math.Ceiling(XmlConvert.ToTimeSpan(periodDuration ?? mediaPresentationDuration ?? "PT0S").TotalSeconds * timescale / duration);
-                                //直播的情况，需要自己计算totalNumber
+                            // 直播的情况，需要自己计算totalNumber
                             if (totalNumber == 0 && isLive)
                             {
                                 var now = DateTime.Now;
                                 var availableTime = DateTime.Parse(availabilityStartTime!);
-                                    //可用时间+偏移量
+                                // 可用时间+偏移量
                                 var offsetMs = TimeSpan.FromMilliseconds(Convert.ToInt64(presentationTimeOffsetStr) / 1000);
                                 availableTime = availableTime.Add(offsetMs);
                                 var ts = now - availableTime;
                                 var updateTs = XmlConvert.ToTimeSpan(timeShiftBufferDepth!);
-                                    //(当前时间到发布时间的时间差 - 最小刷新间隔) / 分片时长
+                                // (当前时间到发布时间的时间差 - 最小刷新间隔) / 分片时长
                                 startNumber += (long)((ts.TotalSeconds - updateTs.TotalSeconds) * timescale / duration);
                                 totalNumber = (long)(updateTs.TotalSeconds * timescale / duration);
                             }
@@ -424,14 +429,14 @@ namespace N_m3u8DL_RE.Parser.Extractor
                                 mediaSegment.Url = mediaUrl;
                                 if (hasNumber)
                                     mediaSegment.NameFromVar = index.ToString();
-                                    mediaSegment.Index = isLive ? index : segIndex; //直播直接用startNumber
+                                mediaSegment.Index = isLive ? index : segIndex; // 直播直接用startNumber
                                 mediaSegment.Duration = duration / (double)timescale;
                                 streamSpec.Playlist.MediaParts[0].MediaSegments.Add(mediaSegment);
                             }
                         }
                     }
 
-                        //如果依旧没被添加分片，直接把BaseUrl塞进去就好
+                    // 如果依旧没被添加分片，直接把BaseUrl塞进去就好
                     if (streamSpec.Playlist.MediaParts[0].MediaSegments.Count == 0)
                     {
                         streamSpec.Playlist.MediaParts[0].MediaSegments.Add
@@ -445,7 +450,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
                         );
                     }
 
-                        //判断加密情况
+                    // 判断加密情况
                     if (adaptationSet.Elements().Concat(representation.Elements()).Any(e => e.Name.LocalName == "ContentProtection"))
                     {
                         if (streamSpec.Playlist.MediaInit != null)
@@ -458,17 +463,17 @@ namespace N_m3u8DL_RE.Parser.Extractor
                         }
                     }
 
-                        //处理同一ID分散在不同Period的情况
+                    // 处理同一ID分散在不同Period的情况
                     var _index = streamList.FindIndex(_f => _f.PeriodId != streamSpec.PeriodId && _f.GroupId == streamSpec.GroupId && _f.Resolution == streamSpec.Resolution && _f.MediaType == streamSpec.MediaType);
                     if (_index > -1)
                     {
                         if (isLive)
                         {
-                                //直播，这种情况直接略过新的
+                            // 直播，这种情况直接略过新的
                         }
                         else
                         {
-                                //点播，这种情况如果URL不同则作为新的part出现，否则仅把时间加起来
+                            // 点播，这种情况如果URL不同则作为新的part出现，否则仅把时间加起来
                             var url1 = streamList[_index].Playlist!.MediaParts.Last().MediaSegments.Last().Url;
                             var url2 = streamSpec.Playlist.MediaParts[0].MediaSegments.LastOrDefault()?.Url;
                             if (url1 != url2)
@@ -492,45 +497,42 @@ namespace N_m3u8DL_RE.Parser.Extractor
                     }
                     else
                     {
-                            //修复mp4类型字幕
+                        // 修复mp4类型字幕
-                            if (streamSpec.MediaType == MediaType.SUBTITLES && streamSpec.Extension == "mp4")
+                        if (streamSpec is { MediaType: MediaType.SUBTITLES, Extension: "mp4" })
                         {
                             streamSpec.Extension = "m4s";
                         }
-                            //分片默认后缀m4s
+                        // 分片默认后缀m4s
                         if (streamSpec.MediaType != MediaType.SUBTITLES && (streamSpec.Extension == null || streamSpec.Playlist.MediaParts.Sum(x => x.MediaSegments.Count) > 1))
                         {
                             streamSpec.Extension = "m4s";
                         }
                         streamList.Add(streamSpec);
                     }
-                        //恢复BaseURL相对位置
+                    // 恢复BaseURL相对位置
                     segBaseUrl = representationsBaseUrl;
                 }
-                    //恢复BaseURL相对位置
+                // 恢复BaseURL相对位置
                 segBaseUrl = adaptationSetsBaseUrl;
             }
         }
 
-            //为视频设置默认轨道
+        // 为视频设置默认轨道
-            var aL = streamList.Where(s => s.MediaType == MediaType.AUDIO);
+        var aL = streamList.Where(s => s.MediaType == MediaType.AUDIO).ToList();
-            var sL = streamList.Where(s => s.MediaType == MediaType.SUBTITLES);
+        var sL = streamList.Where(s => s.MediaType == MediaType.SUBTITLES).ToList();
-            foreach (var item in streamList)
+        foreach (var item in streamList.Where(item => !string.IsNullOrEmpty(item.Resolution)))
         {
-                if (!string.IsNullOrEmpty(item.Resolution))
+            if (aL.Count != 0)
-                {
-                    if (aL.Any())
             {
                 item.AudioId = aL.OrderByDescending(x => x.Bandwidth).First().GroupId;
             }
-                    if (sL.Any())
+            if (sL.Count != 0)
             {
                 item.SubtitleId = sL.OrderByDescending(x => x.Bandwidth).First().GroupId;
             }
         }
-            }
 
-            return streamList;
+        return Task.FromResult(streamList);
     }
 
     /// <summary>
@@ -541,8 +543,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
     private string? FilterLanguage(string? v)
     {
         if (v == null) return null;
-            if (Regex.IsMatch(v, "^[\\w_\\-\\d]+$")) return v;
+        return LangCodeRegex().IsMatch(v) ? v : "und";
-            return "und";
     }
 
     public async Task RefreshPlayListAsync(List<StreamSpec> streamSpecs)
@@ -556,7 +557,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
         }
         catch (HttpRequestException) when (ParserConfig.Url!= ParserConfig.OriginalUrl)
         {
-                //当URL无法访问时，再请求原始URL
+            // 当URL无法访问时，再请求原始URL
             (rawText, url) = await HTTPUtil.GetWebSourceAndNewUrlAsync(ParserConfig.OriginalUrl, ParserConfig.Headers);
         }
 
@@ -566,45 +567,46 @@ namespace N_m3u8DL_RE.Parser.Extractor
         var newStreams = await ExtractStreamsAsync(rawText);
         foreach (var streamSpec in streamSpecs)
         {
-                //有的网站每次请求MPD返回的码率不一致，导致ToShortString()无法匹配 无法更新playlist
+            // 有的网站每次请求MPD返回的码率不一致，导致ToShortString()无法匹配 无法更新playlist
-                //故增加通过init url来匹配 (如果有的话)
+            // 故增加通过init url来匹配 (如果有的话)
             var match = newStreams.Where(n => n.ToShortString() == streamSpec.ToShortString());
             if (!match.Any())
                 match = newStreams.Where(n => n.Playlist?.MediaInit?.Url == streamSpec.Playlist?.MediaInit?.Url);
 
             if (match.Any())
-                    streamSpec.Playlist!.MediaParts = match.First().Playlist!.MediaParts; //不更新init
+                streamSpec.Playlist!.MediaParts = match.First().Playlist!.MediaParts; // 不更新init
         }
-            //这里才调用URL预处理器，节省开销
+        // 这里才调用URL预处理器，节省开销
         await ProcessUrlAsync(streamSpecs);
     }
 
-        private async Task ProcessUrlAsync(List<StreamSpec> streamSpecs)
+    private Task ProcessUrlAsync(List<StreamSpec> streamSpecs)
     {
-            for (int i = 0; i < streamSpecs.Count; i++)
+        foreach (var streamSpec in streamSpecs)
-            {
-                var playlist = streamSpecs[i].Playlist;
-                if (playlist != null)
         {
+            var playlist = streamSpec.Playlist;
+            if (playlist == null) continue;
+            
             if (playlist.MediaInit != null)
             {
                 playlist.MediaInit!.Url = PreProcessUrl(playlist.MediaInit!.Url);
             }
-                    for (int ii = 0; ii < playlist!.MediaParts.Count; ii++)
+            for (var ii = 0; ii < playlist!.MediaParts.Count; ii++)
             {
                 var part = playlist.MediaParts[ii];
-                        for (int iii = 0; iii < part.MediaSegments.Count; iii++)
+                foreach (var mediaSegment in part.MediaSegments)
                 {
-                            part.MediaSegments[iii].Url = PreProcessUrl(part.MediaSegments[iii].Url);
+                    mediaSegment.Url = PreProcessUrl(mediaSegment.Url);
-                        }
-                    }
                 }
             }
         }
 
+        return Task.CompletedTask;
+    }
+
     public async Task FetchPlayListAsync(List<StreamSpec> streamSpecs)
     {
-            //这里才调用URL预处理器，节省开销
+        // 这里才调用URL预处理器，节省开销
         await ProcessUrlAsync(streamSpecs);
     }
 
@@ -631,5 +633,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
             }
         }
     }
-    }
+
+    [GeneratedRegex(@"^[\w_\-\d]+$")]
+    private static partial Regex LangCodeRegex();
 }

src/N_m3u8DL-RE.Parser/Extractor/HLSExtractor.cs

@@ -5,18 +5,12 @@ using N_m3u8DL_RE.Common.Log;
 using N_m3u8DL_RE.Common.Resource;
 using N_m3u8DL_RE.Parser.Util;
 using N_m3u8DL_RE.Parser.Constants;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Text.RegularExpressions;
-using System.Threading.Tasks;
 using N_m3u8DL_RE.Common.Util;
 
-namespace N_m3u8DL_RE.Parser.Extractor
+namespace N_m3u8DL_RE.Parser.Extractor;
+
+internal class HLSExtractor : IExtractor
 {
-    internal class HLSExtractor : IExtractor
-    {
     public ExtractorType ExtractorType => ExtractorType.HLS;
 
     private string M3u8Url = string.Empty;
@@ -26,8 +20,6 @@ namespace N_m3u8DL_RE.Parser.Extractor
 
     public ParserConfig ParserConfig { get; set; }
 
-        private HLSExtractor() { }
-
     public HLSExtractor(ParserConfig parserConfig)
     {
         this.ParserConfig = parserConfig;
@@ -37,14 +29,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
 
     private void SetBaseUrl()
     {
-            if (!string.IsNullOrEmpty(ParserConfig.BaseUrl))
+        this.BaseUrl = !string.IsNullOrEmpty(ParserConfig.BaseUrl) ? ParserConfig.BaseUrl : this.M3u8Url;
-            {
-                this.BaseUrl = ParserConfig.BaseUrl;
-            }
-            else
-            {
-                this.BaseUrl = this.M3u8Url;
-            }
     }
 
     /// <summary>
@@ -83,11 +68,11 @@ namespace N_m3u8DL_RE.Parser.Extractor
         return url;
     }
 
-        private async Task<List<StreamSpec>> ParseMasterListAsync()
+    private Task<List<StreamSpec>> ParseMasterListAsync()
     {
         MasterM3u8Flag = true;
 
-            List<StreamSpec> streams = new List<StreamSpec>();
+        List<StreamSpec> streams = [];
 
         using StringReader sr = new StringReader(M3u8Content);
         string? line;
@@ -128,7 +113,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
                 if (!string.IsNullOrEmpty(videoRange))
                     streamSpec.VideoRange = videoRange;
 
-                    //清除多余的编码信息 dvh1.05.06,ec-3 => dvh1.05.06
+                // 清除多余的编码信息 dvh1.05.06,ec-3 => dvh1.05.06
                 if (!string.IsNullOrEmpty(streamSpec.Codecs) && !string.IsNullOrEmpty(streamSpec.AudioId))
                 {
                     streamSpec.Codecs = streamSpec.Codecs.Split(',')[0];
@@ -145,7 +130,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
                     streamSpec.MediaType = mediaType;
                 }
 
-                    //跳过CLOSED_CAPTIONS类型（目前不支持）
+                // 跳过CLOSED_CAPTIONS类型（目前不支持）
                 if (streamSpec.MediaType == MediaType.CLOSED_CAPTIONS)
                 {
                     continue;
@@ -201,7 +186,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
 
                 streams.Add(streamSpec);
             }
-                else if (line.StartsWith("#"))
+            else if (line.StartsWith('#'))
             {
                 continue;
             }
@@ -214,13 +199,19 @@ namespace N_m3u8DL_RE.Parser.Extractor
             }
         }
 
-            return streams;
+        return Task.FromResult(streams);
     }
 
-        private async Task<Playlist> ParseListAsync()
+    private Task<Playlist> ParseListAsync()
     {
-            //标记是否已清除优酷广告分片
+        // 标记是否已清除广告分片
         bool hasAd = false;
+        ;
+        bool allowHlsMultiExtMap = ParserConfig.CustomParserArgs.TryGetValue("AllowHlsMultiExtMap", out var allMultiExtMap) && allMultiExtMap == "true";
+        if (allowHlsMultiExtMap)
+        {
+            Logger.WarnMarkUp($"[darkorange3_1]{ResString.allowHlsMultiExtMap}[/]");
+        }
         
         using StringReader sr = new StringReader(M3u8Content);
         string? line;
@@ -231,22 +222,22 @@ namespace N_m3u8DL_RE.Parser.Extractor
         long startIndex;
 
         Playlist playlist = new();
-            List<MediaPart> mediaParts = new();
+        List<MediaPart> mediaParts = [];
 
-            //当前的加密信息
+        // 当前的加密信息
         EncryptInfo currentEncryptInfo = new();
         if (ParserConfig.CustomMethod != null)
             currentEncryptInfo.Method = ParserConfig.CustomMethod.Value;
-            if (ParserConfig.CustomeKey != null && ParserConfig.CustomeKey.Length > 0) 
+        if (ParserConfig.CustomeKey is { Length: > 0 }) 
             currentEncryptInfo.Key = ParserConfig.CustomeKey;
-            if (ParserConfig.CustomeIV != null && ParserConfig.CustomeIV.Length > 0)
+        if (ParserConfig.CustomeIV is { Length: > 0 })
             currentEncryptInfo.IV = ParserConfig.CustomeIV;
-            //上次读取到的加密行，#EXT-X-KEY:……
+        // 上次读取到的加密行，#EXT-X-KEY:……
         string lastKeyLine = "";
 
         MediaPart mediaPart = new();
         MediaSegment segment = new();
-            List<MediaSegment> segments = new();
+        List<MediaSegment> segments = [];
 
 
         while ((line = sr.ReadLine()) != null)
@@ -254,7 +245,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
             if (string.IsNullOrEmpty(line))
                 continue;
 
-                //只下载部分字节
+            // 只下载部分字节
             if (line.StartsWith(HLSTags.ext_x_byterange))
             {
                 var p = ParserUtil.GetAttribute(line);
@@ -263,7 +254,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
                 segment.StartRange = o ?? segments.Last().StartRange + segments.Last().ExpectLength;
                 expectSegment = true;
             }
-                //国家地理去广告
+            // 国家地理去广告
             else if (line.StartsWith("#UPLYNK-SEGMENT"))
             {
                 if (line.Contains(",ad"))
@@ -271,58 +262,57 @@ namespace N_m3u8DL_RE.Parser.Extractor
                 else if (line.Contains(",segment"))
                     isAd = false;
             }
-                //国家地理去广告
+            // 国家地理去广告
             else if (isAd)
             {
                 continue;
             }
-                //解析定义的分段长度
+            // 解析定义的分段长度
             else if (line.StartsWith(HLSTags.ext_x_targetduration))
             {
                 playlist.TargetDuration = Convert.ToDouble(ParserUtil.GetAttribute(line));
             }
-                //解析起始编号
+            // 解析起始编号
             else if (line.StartsWith(HLSTags.ext_x_media_sequence))
             {
                 segIndex = Convert.ToInt64(ParserUtil.GetAttribute(line));
                 startIndex = segIndex;
             }
-                //program date time
+            // program date time
             else if (line.StartsWith(HLSTags.ext_x_program_date_time))
             {
                 segment.DateTime = DateTime.Parse(ParserUtil.GetAttribute(line));
             }
-                //解析不连续标记，需要单独合并（timestamp不同）
+            // 解析不连续标记，需要单独合并（timestamp不同）
             else if (line.StartsWith(HLSTags.ext_x_discontinuity))
             {
-                    //修复优酷去除广告后的遗留问题
+                // 修复YK去除广告后的遗留问题
                 if (hasAd && mediaParts.Count > 0)
                 {
-                        segments = mediaParts[mediaParts.Count - 1].MediaSegments;
+                    segments = mediaParts[^1].MediaSegments;
                     mediaParts.RemoveAt(mediaParts.Count - 1);
                     hasAd = false;
                     continue;
                 }
-                    //常规情况的#EXT-X-DISCONTINUITY标记，新建part
+                // 常规情况的#EXT-X-DISCONTINUITY标记，新建part
-                    if (!hasAd && segments.Count >= 1)
+                if (hasAd || segments.Count < 1) continue;
-                    {
+                
-                        mediaParts.Add(new MediaPart()
+                mediaParts.Add(new MediaPart
                 {
                     MediaSegments = segments,
                 });
                 segments = new();
             }
-                }
+            // 解析KEY
-                //解析KEY
             else if (line.StartsWith(HLSTags.ext_x_key))
             {
                 var uri = ParserUtil.GetAttribute(line, "URI");
                 var uri_last = ParserUtil.GetAttribute(lastKeyLine, "URI");
                     
-                    //如果KEY URL相同，不进行重复解析
+                // 如果KEY URL相同，不进行重复解析
                 if (uri != uri_last)
                 {
-                        //调用处理器进行解析
+                    // 调用处理器进行解析
                     var parsedInfo = ParseKey(line);
                     currentEncryptInfo.Method = parsedInfo.Method;
                     currentEncryptInfo.Key = parsedInfo.Key;
@@ -330,13 +320,13 @@ namespace N_m3u8DL_RE.Parser.Extractor
                 }
                 lastKeyLine = line;
             }
-                //解析分片时长
+            // 解析分片时长
             else if (line.StartsWith(HLSTags.extinf))
             {
                 string[] tmp = ParserUtil.GetAttribute(line).Split(',');
                 segment.Duration = Convert.ToDouble(tmp[0]);
                 segment.Index = segIndex;
-                    //是否有加密，有的话写入KEY和IV
+                // 是否有加密，有的话写入KEY和IV
                 if (currentEncryptInfo.Method != EncryptMethod.NONE)
                 {
                     segment.EncryptInfo.Method = currentEncryptInfo.Method;
@@ -346,7 +336,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
                 expectSegment = true;
                 segIndex++;
             }
-                //m3u8主体结束
+            // m3u8主体结束
             else if (line.StartsWith(HLSTags.ext_x_endlist))
             {
                 if (segments.Count > 0)
@@ -359,15 +349,15 @@ namespace N_m3u8DL_RE.Parser.Extractor
                 segments = new();
                 isEndlist = true;
             }
-                //#EXT-X-MAP
+            // #EXT-X-MAP
             else if (line.StartsWith(HLSTags.ext_x_map))
             {
-                    if (playlist.MediaInit == null) 
+                if (playlist.MediaInit == null || hasAd) 
                 {
                     playlist.MediaInit = new MediaSegment()
                     {
                         Url = PreProcessUrl(ParserUtil.CombineURL(BaseUrl, ParserUtil.GetAttribute(line, "URI"))),
-                            Index = -1, //便于排序
+                        Index = -1, // 便于排序
                     };
                     if (line.Contains("BYTERANGE"))
                     {
@@ -376,15 +366,13 @@ namespace N_m3u8DL_RE.Parser.Extractor
                         playlist.MediaInit.ExpectLength = n;
                         playlist.MediaInit.StartRange = o ?? 0L;
                     }
-                        //是否有加密，有的话写入KEY和IV
+                    if (currentEncryptInfo.Method == EncryptMethod.NONE) continue;
-                        if (currentEncryptInfo.Method != EncryptMethod.NONE)
+                    // 有加密的话写入KEY和IV
-                        {
                     playlist.MediaInit.EncryptInfo.Method = currentEncryptInfo.Method;
                     playlist.MediaInit.EncryptInfo.Key = currentEncryptInfo.Key;
                     playlist.MediaInit.EncryptInfo.IV = currentEncryptInfo.IV ?? HexUtil.HexToBytes(Convert.ToString(segIndex, 16).PadLeft(32, '0'));
                 }
-                    }
+                // 遇到了其他的map，说明已经不是一个视频了，全部丢弃即可
-                    //遇到了其他的map，说明已经不是一个视频了，全部丢弃即可
                 else
                 {
                     if (segments.Count > 0)
@@ -395,31 +383,34 @@ namespace N_m3u8DL_RE.Parser.Extractor
                         });
                     }
                     segments = new();
+                    if (!allowHlsMultiExtMap)
+                    {
                         isEndlist = true;
                         break;
                     }
                 }
-                //评论行不解析
+            }
-                else if (line.StartsWith("#")) continue;
+            // 评论行不解析
-                //空白行不解析
+            else if (line.StartsWith('#')) continue;
+            // 空白行不解析
             else if (line.StartsWith("\r\n")) continue;
-                //解析分片的地址
+            // 解析分片的地址
             else if (expectSegment)
             {
                 var segUrl = PreProcessUrl(ParserUtil.CombineURL(BaseUrl, line));
                 segment.Url = segUrl;
                 segments.Add(segment);
                 segment = new();
-                    //优酷的广告分段则清除此分片
+                // YK的广告分段则清除此分片
-                    //需要注意，遇到广告说明程序对上文的#EXT-X-DISCONTINUITY做出的动作是不必要的，
+                // 需要注意，遇到广告说明程序对上文的#EXT-X-DISCONTINUITY做出的动作是不必要的，
-                    //其实上下文是同一种编码，需要恢复到原先的part上
+                // 其实上下文是同一种编码，需要恢复到原先的part上
                 if (segUrl.Contains("ccode=") && segUrl.Contains("/ad/") && segUrl.Contains("duration="))
                 {
                     segments.RemoveAt(segments.Count - 1);
                     segIndex--;
                     hasAd = true;
                 }
-                    //优酷广告(4K分辨率测试)
+                // YK广告(4K分辨率测试)
                 if (segUrl.Contains("ccode=0902") && segUrl.Contains("duration="))
                 {
                     segments.RemoveAt(segments.Count - 1);
@@ -430,7 +421,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
             }
         }
 
-            //直播的情况，无法遇到m3u8结束标记，需要手动将segments加入parts
+        // 直播的情况，无法遇到m3u8结束标记，需要手动将segments加入parts
         if (!isEndlist)
         {
             mediaParts.Add(new MediaPart()
@@ -442,14 +433,14 @@ namespace N_m3u8DL_RE.Parser.Extractor
         playlist.MediaParts = mediaParts;
         playlist.IsLive = !isEndlist;
 
-            //直播刷新间隔
+        // 直播刷新间隔
         if (playlist.IsLive)
         {
-                //由于播放器默认从最后3个分片开始播放 此处设置刷新间隔为TargetDuration的2倍
+            // 由于播放器默认从最后3个分片开始播放 此处设置刷新间隔为TargetDuration的2倍
             playlist.RefreshIntervalMs = (int)((playlist.TargetDuration ?? 5) * 2 * 1000);
         }
 
-            return playlist;
+        return Task.FromResult(playlist);
     }
 
     private EncryptInfo ParseKey(string keyLine)
@@ -458,7 +449,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
         {
             if (p.CanProcess(ExtractorType, keyLine, M3u8Url, M3u8Content, ParserConfig))
             {
-                    //匹配到对应处理器后不再继续
+                // 匹配到对应处理器后不再继续
                 return p.Process(keyLine, M3u8Url, M3u8Content, ParserConfig);
             }
         }
@@ -477,24 +468,22 @@ namespace N_m3u8DL_RE.Parser.Extractor
             lists = lists.DistinctBy(p => p.Url).ToList();
             return lists;
         }
-            else
+
-            {
         var playlist = await ParseListAsync();
-                return new List<StreamSpec>()
+        return
-                {
+        [
-                    new StreamSpec()
+            new()
             {
                 Url = ParserConfig.Url,
                 Playlist = playlist,
                 Extension = playlist.MediaInit != null ? "mp4" : "ts"
             }
-                };
+        ];
-            }
     }
 
     private async Task LoadM3u8FromUrlAsync(string url)
     {
-            //Logger.Info(ResString.loadingUrl + url);
+        // Logger.Info(ResString.loadingUrl + url);
         if (url.StartsWith("file:"))
         {
             var uri = new Uri(url);
@@ -508,7 +497,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
             }
             catch (HttpRequestException) when (url != ParserConfig.OriginalUrl)
             {
-                    //当URL无法访问时，再请求原始URL
+                // 当URL无法访问时，再请求原始URL
                 (this.M3u8Content, url) = await HTTPUtil.GetWebSourceAndNewUrlAsync(ParserConfig.OriginalUrl, ParserConfig.Headers);
             }
         }
@@ -525,20 +514,19 @@ namespace N_m3u8DL_RE.Parser.Extractor
     /// <returns></returns>
     private async Task RefreshUrlFromMaster(List<StreamSpec> lists)
     {
-            //重新加载master m3u8, 刷新选中流的URL
+        // 重新加载master m3u8, 刷新选中流的URL
         await LoadM3u8FromUrlAsync(ParserConfig.Url);
         var newStreams = await ParseMasterListAsync();
         newStreams = newStreams.DistinctBy(p => p.Url).ToList();
         foreach (var l in lists)
         {
-                var match = newStreams.Where(n => n.ToShortString() == l.ToShortString());
+            var match = newStreams.Where(n => n.ToShortString() == l.ToShortString()).ToList();
-                if (match.Any())
+            if (match.Count == 0) continue;
-                {
+            
             Logger.DebugMarkUp($"{l.Url} => {match.First().Url}");
             l.Url = match.First().Url;
         }
     }
-        }
 
     public async Task FetchPlayListAsync(List<StreamSpec> lists)
     {
@@ -546,20 +534,20 @@ namespace N_m3u8DL_RE.Parser.Extractor
         {
             try
             {
-                    //直接重新加载m3u8
+                // 直接重新加载m3u8
                 await LoadM3u8FromUrlAsync(lists[i].Url!);
             }
-                catch (HttpRequestException) when (MasterM3u8Flag == true)
+            catch (HttpRequestException) when (MasterM3u8Flag)
             {
                 Logger.WarnMarkUp("Can not load m3u8. Try refreshing url from master url...");
-                    //当前URL无法加载 尝试从Master链接中刷新URL
+                // 当前URL无法加载 尝试从Master链接中刷新URL
                 await RefreshUrlFromMaster(lists);
                 await LoadM3u8FromUrlAsync(lists[i].Url!);
             }
 
             var newPlaylist = await ParseListAsync();
             if (lists[i].Playlist?.MediaInit != null)
-                    lists[i].Playlist!.MediaParts = newPlaylist.MediaParts; //不更新init
+                lists[i].Playlist!.MediaParts = newPlaylist.MediaParts; // 不更新init
             else
                 lists[i].Playlist = newPlaylist;
 
@@ -581,5 +569,4 @@ namespace N_m3u8DL_RE.Parser.Extractor
     {
         await FetchPlayListAsync(streamSpecs);
     }
-    }
 }

src/N_m3u8DL-RE.Parser/Extractor/IExtractor.cs

@@ -1,16 +1,11 @@
 using N_m3u8DL_RE.Parser.Config;
 using N_m3u8DL_RE.Common.Entity;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using N_m3u8DL_RE.Common.Enum;
 
-namespace N_m3u8DL_RE.Parser.Extractor
+namespace N_m3u8DL_RE.Parser.Extractor;
+
+public interface IExtractor
 {
-    public interface IExtractor
-    {
     ExtractorType ExtractorType { get; }
 
     ParserConfig ParserConfig { get; set; }
@@ -23,5 +18,4 @@ namespace N_m3u8DL_RE.Parser.Extractor
     string PreProcessUrl(string url);
 
     void PreProcessContent();
-    }
 }

src/N_m3u8DL-RE.Parser/Extractor/LiveTSExtractor.cs

@@ -3,10 +3,10 @@ using N_m3u8DL_RE.Common.Enum;
 using N_m3u8DL_RE.Common.Resource;
 using N_m3u8DL_RE.Parser.Config;
 
-namespace N_m3u8DL_RE.Parser.Extractor
+namespace N_m3u8DL_RE.Parser.Extractor;
+
+internal class LiveTSExtractor : IExtractor
 {
-    internal class LiveTSExtractor : IExtractor
-    {
     public ExtractorType ExtractorType => ExtractorType.HTTP_LIVE;
 
     public ParserConfig ParserConfig {get; set;}
@@ -16,26 +16,26 @@ namespace N_m3u8DL_RE.Parser.Extractor
         this.ParserConfig = parserConfig;
     }
 
-        public async Task<List<StreamSpec>> ExtractStreamsAsync(string rawText)
+    public Task<List<StreamSpec>> ExtractStreamsAsync(string rawText)
     {
-            return new List<StreamSpec>()
+        return Task.FromResult(new List<StreamSpec>
         {
-                new StreamSpec()
+            new()
             {
                 OriginalUrl = ParserConfig.OriginalUrl,
                 Url = ParserConfig.Url,
                 Playlist = new Playlist(),
                 GroupId = ResString.ReLiveTs
             }
-            };
+        });
     }
 
-        public async Task FetchPlayListAsync(List<StreamSpec> streamSpecs)
+    public Task FetchPlayListAsync(List<StreamSpec> streamSpecs)
     {
         throw new NotImplementedException();
     }
 
-        public async void PreProcessContent()
+    public void PreProcessContent()
     {
         throw new NotImplementedException();
     }
@@ -49,5 +49,4 @@ namespace N_m3u8DL_RE.Parser.Extractor
     {
         throw new NotImplementedException();
     }
-    }
 }

src/N_m3u8DL-RE.Parser/Extractor/MSSExtractor.cs

@@ -6,23 +6,16 @@ using N_m3u8DL_RE.Parser.Config;
 using N_m3u8DL_RE.Parser.Constants;
 using N_m3u8DL_RE.Parser.Mp4;
 using N_m3u8DL_RE.Parser.Util;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Security.Cryptography;
-using System.Text;
 using System.Text.RegularExpressions;
-using System.Threading.Tasks;
-using System.Xml;
 using System.Xml.Linq;
 
-namespace N_m3u8DL_RE.Parser.Extractor
+namespace N_m3u8DL_RE.Parser.Extractor;
+
+// Microsoft Smooth Streaming
+// https://test.playready.microsoft.com/smoothstreaming/SSWSS720H264/SuperSpeedway_720.ism/manifest
+// file:///C:/Users/nilaoda/Downloads/[MS-SSTR]-180316.pdf
+internal partial class MSSExtractor : IExtractor
 {
-    //Microsoft Smooth Streaming
-    //https://test.playready.microsoft.com/smoothstreaming/SSWSS720H264/SuperSpeedway_720.ism/manifest
-    //file:///C:/Users/nilaoda/Downloads/[MS-SSTR]-180316.pdf
-    internal partial class MSSExtractor : IExtractor
-    {
     [GeneratedRegex("00000001\\d7([0-9a-fA-F]{6})")]
     private static partial Regex VCodecsRegex();
 
@@ -46,13 +39,10 @@ namespace N_m3u8DL_RE.Parser.Extractor
     private void SetInitUrl()
     {
         this.IsmUrl = ParserConfig.Url ?? string.Empty;
-            if (!string.IsNullOrEmpty(ParserConfig.BaseUrl))
+        this.BaseUrl = !string.IsNullOrEmpty(ParserConfig.BaseUrl) ? ParserConfig.BaseUrl : this.IsmUrl;
-                this.BaseUrl = ParserConfig.BaseUrl;
-            else
-                this.BaseUrl = this.IsmUrl;
     }
 
-        public async Task<List<StreamSpec>> ExtractStreamsAsync(string rawText)
+    public Task<List<StreamSpec>> ExtractStreamsAsync(string rawText)
     {
         var streamList = new List<StreamSpec>();
         this.IsmContent = rawText;
@@ -60,7 +50,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
 
         var xmlDocument = XDocument.Parse(IsmContent);
 
-            //选中第一个SmoothStreamingMedia节点
+        // 选中第一个SmoothStreamingMedia节点
         var ssmElement = xmlDocument.Elements().First(e => e.Name.LocalName == "SmoothStreamingMedia");
         var timeScaleStr = ssmElement.Attribute("TimeScale")?.Value ?? "10000000";
         var durationStr = ssmElement.Attribute("Duration")?.Value;
@@ -72,7 +62,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
         var protectionSystemId = "";
         var protectionData = "";
 
-            //加密检测
+        // 加密检测
         var protectElement = ssmElement.Elements().FirstOrDefault(e => e.Name.LocalName == "Protection");
         if (protectElement != null)
         {
@@ -85,26 +75,26 @@ namespace N_m3u8DL_RE.Parser.Extractor
             }
         }
 
-            //所有StreamIndex节点
+        // 所有StreamIndex节点
         var streamIndexElements = ssmElement.Elements().Where(e => e.Name.LocalName == "StreamIndex");
 
         foreach (var streamIndex in streamIndexElements)
         {
-                var type = streamIndex.Attribute("Type")?.Value; //"video" / "audio" / "text"
+            var type = streamIndex.Attribute("Type")?.Value; // "video" / "audio" / "text"
             var name = streamIndex.Attribute("Name")?.Value;
-                var subType = streamIndex.Attribute("Subtype")?.Value; //text track
+            var subType = streamIndex.Attribute("Subtype")?.Value; // text track
-                //如果有则不从QualityLevel读取
+            // 如果有则不从QualityLevel读取
-                //Bitrate = "{bitrate}" / "{Bitrate}"
+            // Bitrate = "{bitrate}" / "{Bitrate}"
-                //StartTimeSubstitution = "{start time}" / "{start_time}"
+            // StartTimeSubstitution = "{start time}" / "{start_time}"
             var urlPattern = streamIndex.Attribute("Url")?.Value;
             var language = streamIndex.Attribute("Language")?.Value;
-                //去除不规范的语言标签
+            // 去除不规范的语言标签
             if (language?.Length != 3) language = null;
 
-                //所有c节点
+            // 所有c节点
             var cElements = streamIndex.Elements().Where(e => e.Name.LocalName == "c");
 
-                //所有QualityLevel节点
+            // 所有QualityLevel节点
             var qualityLevelElements = streamIndex.Elements().Where(e => e.Name.LocalName == "QualityLevel");
 
             foreach (var qualityLevel in qualityLevelElements)
@@ -124,7 +114,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
                 var channels = qualityLevel.Attribute("Channels")?.Value;
 
                 StreamSpec streamSpec = new();
-                    streamSpec.PublishTime = DateTime.Now; //发布时间默认现在
+                streamSpec.PublishTime = DateTime.Now; // 发布时间默认现在
                 streamSpec.Extension = "m4s";
                 streamSpec.OriginalUrl = ParserConfig.OriginalUrl;
                 streamSpec.PeriodId = indexStr;
@@ -148,7 +138,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
                 streamSpec.Playlist.MediaInit = new MediaSegment();
                 if (!string.IsNullOrEmpty(codecPrivateData))
                 {
-                        streamSpec.Playlist.MediaInit.Index = -1; //便于排序
+                    streamSpec.Playlist.MediaInit.Index = -1; // 便于排序
                     streamSpec.Playlist.MediaInit.Url = $"hex://{codecPrivateData}";
                 }
 
@@ -159,7 +149,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
 
                 foreach (var c in cElements)
                 {
-                        //每个C元素包含三个属性:@t(start time)\@r(repeat count)\@d(duration)
+                    // 每个C元素包含三个属性:@t(start time)\@r(repeat count)\@d(duration)
                     var _startTimeStr = c.Attribute("t")?.Value;
                     var _durationStr = c.Attribute("d")?.Value;
                     var _repeatCountStr = c.Attribute("r")?.Value;
@@ -185,7 +175,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
                     streamSpec.Playlist.MediaParts[0].MediaSegments.Add(mediaSegment);
                     if (_repeatCount < 0)
                     {
-                            //负数表示一直重复 直到period结束 注意减掉已经加入的1个片段
+                        // 负数表示一直重复 直到period结束 注意减掉已经加入的1个片段
                         _repeatCount = (long)Math.Ceiling(Convert.ToInt64(durationStr) / (double)_duration) - 1;
                     }
                     for (long i = 0; i < _repeatCount; i++)
@@ -205,7 +195,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
                     currentTime += _duration;
                 }
 
-                    //生成MOOV数据
+                // 生成MOOV数据
                 if (MSSMoovProcessor.CanHandle(fourCC!))
                 {
                     streamSpec.MSSData = new MSSData()
@@ -224,9 +214,9 @@ namespace N_m3u8DL_RE.Parser.Extractor
                         ProtectionSystemID = protectionSystemId,
                     };
                     var processor = new MSSMoovProcessor(streamSpec);
-                        var header = processor.GenHeader(); //trackId可能不正确
+                    var header = processor.GenHeader(); // trackId可能不正确
                     streamSpec.Playlist!.MediaInit!.Url = $"base64://{Convert.ToBase64String(header)}";
-                        //为音视频写入加密信息
+                    // 为音视频写入加密信息
                     if (isProtection && type != "text") 
                     {
                         if (streamSpec.Playlist.MediaInit != null)
@@ -243,30 +233,26 @@ namespace N_m3u8DL_RE.Parser.Extractor
                 else
                 {
                     Logger.WarnMarkUp($"[green]{fourCC}[/] not supported! Skiped.");
-                        continue;
                 }
             }
         }
 
-            //为视频设置默认轨道
+        // 为视频设置默认轨道
-            var aL = streamList.Where(s => s.MediaType == MediaType.AUDIO);
+        var aL = streamList.Where(s => s.MediaType == MediaType.AUDIO).ToList();
-            var sL = streamList.Where(s => s.MediaType == MediaType.SUBTITLES);
+        var sL = streamList.Where(s => s.MediaType == MediaType.SUBTITLES).ToList();
-            foreach (var item in streamList)
+        foreach (var item in streamList.Where(item => !string.IsNullOrEmpty(item.Resolution)))
         {
-                if (!string.IsNullOrEmpty(item.Resolution))
+            if (aL.Count != 0)
-                {
-                    if (aL.Any())
             {
                 item.AudioId = aL.First().GroupId;
             }
-                    if (sL.Any())
+            if (sL.Count != 0)
             {
                 item.SubtitleId = sL.First().GroupId;
             }
         }
-            }
 
-            return streamList;
+        return Task.FromResult(streamList);
     }
 
     /// <summary>
@@ -281,11 +267,11 @@ namespace N_m3u8DL_RE.Parser.Extractor
 
         return fourCC switch
         {
-                //AVC视频
+            // AVC视频
             "H264" or "X264" or "DAVC" or "AVC1" => ParseAVCCodecs(privateData),
-                //AAC音频
+            // AAC音频
             "AAC" or "AACL" or "AACH" or "AACP" => ParseAACCodecs(fourCC, privateData),
-                //默认返回fourCC本身
+            // 默认返回fourCC本身
             _ => fourCC.ToLower()
         };
     }
@@ -313,31 +299,32 @@ namespace N_m3u8DL_RE.Parser.Extractor
 
     public async Task FetchPlayListAsync(List<StreamSpec> streamSpecs)
     {
-            //这里才调用URL预处理器，节省开销
+        // 这里才调用URL预处理器，节省开销
         await ProcessUrlAsync(streamSpecs);
     }
 
-        private async Task ProcessUrlAsync(List<StreamSpec> streamSpecs)
+    private Task ProcessUrlAsync(List<StreamSpec> streamSpecs)
     {
-            for (int i = 0; i < streamSpecs.Count; i++)
+        foreach (var streamSpec in streamSpecs)
-            {
-                var playlist = streamSpecs[i].Playlist;
-                if (playlist != null)
         {
+            var playlist = streamSpec.Playlist;
+            if (playlist == null) continue;
+            
             if (playlist.MediaInit != null)
             {
                 playlist.MediaInit!.Url = PreProcessUrl(playlist.MediaInit!.Url);
             }
-                    for (int ii = 0; ii < playlist!.MediaParts.Count; ii++)
+            for (var ii = 0; ii < playlist!.MediaParts.Count; ii++)
             {
                 var part = playlist.MediaParts[ii];
-                        for (int iii = 0; iii < part.MediaSegments.Count; iii++)
+                foreach (var segment in part.MediaSegments)
                 {
-                            part.MediaSegments[iii].Url = PreProcessUrl(part.MediaSegments[iii].Url);
+                    segment.Url = PreProcessUrl(segment.Url);
-                        }
                 }
             }
         }
+
+        return Task.CompletedTask;
     }
 
     public string PreProcessUrl(string url)
@@ -375,7 +362,7 @@ namespace N_m3u8DL_RE.Parser.Extractor
         }
         catch (HttpRequestException) when (ParserConfig.Url != ParserConfig.OriginalUrl)
         {
-                //当URL无法访问时，再请求原始URL
+            // 当URL无法访问时，再请求原始URL
             (rawText, url) = await HTTPUtil.GetWebSourceAndNewUrlAsync(ParserConfig.OriginalUrl, ParserConfig.Headers);
         }
 
@@ -385,17 +372,16 @@ namespace N_m3u8DL_RE.Parser.Extractor
         var newStreams = await ExtractStreamsAsync(rawText);
         foreach (var streamSpec in streamSpecs)
         {
-                //有的网站每次请求MPD返回的码率不一致，导致ToShortString()无法匹配 无法更新playlist
+            // 有的网站每次请求MPD返回的码率不一致，导致ToShortString()无法匹配 无法更新playlist
-                //故增加通过init url来匹配 (如果有的话)
+            // 故增加通过init url来匹配 (如果有的话)
             var match = newStreams.Where(n => n.ToShortString() == streamSpec.ToShortString());
             if (!match.Any())
                 match = newStreams.Where(n => n.Playlist?.MediaInit?.Url == streamSpec.Playlist?.MediaInit?.Url);
 
             if (match.Any())
-                    streamSpec.Playlist!.MediaParts = match.First().Playlist!.MediaParts; //不更新init
+                streamSpec.Playlist!.MediaParts = match.First().Playlist!.MediaParts; // 不更新init
         }
-            //这里才调用URL预处理器，节省开销
+        // 这里才调用URL预处理器，节省开销
         await ProcessUrlAsync(streamSpecs);
     }
-    }
 }

src/N_m3u8DL-RE.Parser/Mp4/BinaryReader2.cs

@@ -1,15 +1,8 @@
-using System;
+namespace Mp4SubtitleParser;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace Mp4SubtitleParser
+// make BinaryReader in Big Endian
+class BinaryReader2 : BinaryReader
 {
-    //make BinaryReader in Big Endian
-    class BinaryReader2 : BinaryReader
-    {
     public BinaryReader2(System.IO.Stream stream) : base(stream) { }
 
     public bool HasMoreData()
@@ -66,5 +59,4 @@ namespace Mp4SubtitleParser
             Array.Reverse(data);
         return BitConverter.ToUInt64(data, 0);
     }
-    }
 }

src/N_m3u8DL-RE.Parser/Mp4/BinaryWriter2.cs

@@ -1,15 +1,10 @@
-using System;
+using System.Text;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace Mp4SubtitleParser
+namespace Mp4SubtitleParser;
+
+// make BinaryWriter in Big Endian
+class BinaryWriter2 : BinaryWriter
 {
-    //make BinaryWriter in Big Endian
-    class BinaryWriter2 : BinaryWriter
-    {
     private static bool IsLittleEndian = BitConverter.IsLittleEndian;
     public BinaryWriter2(System.IO.Stream stream) : base(stream) { }
 
@@ -85,5 +80,4 @@ namespace Mp4SubtitleParser
         }
         BaseStream.Write(arr);
     }
-    }
 }

src/N_m3u8DL-RE.Parser/Mp4/MP4InitUtil.cs

@@ -1,5 +1,4 @@
 using N_m3u8DL_RE.Common.Util;
-using System.Security.Cryptography;
 
 namespace Mp4SubtitleParser
 {
@@ -11,16 +10,16 @@ namespace Mp4SubtitleParser
         public bool isMultiDRM;
     }
 
-    public class MP4InitUtil
+    public static class MP4InitUtil
     {
-        private static readonly byte[] SYSTEM_ID_WIDEVINE = { 0xED, 0xEF, 0x8B, 0xA9, 0x79, 0xD6, 0x4A, 0xCE, 0xA3, 0xC8, 0x27, 0xDC, 0xD5, 0x1D, 0x21, 0xED };
+        private static readonly byte[] SYSTEM_ID_WIDEVINE = [0xED, 0xEF, 0x8B, 0xA9, 0x79, 0xD6, 0x4A, 0xCE, 0xA3, 0xC8, 0x27, 0xDC, 0xD5, 0x1D, 0x21, 0xED];
-        private static readonly byte[] SYSTEM_ID_PLAYREADY = { 0x9A, 0x04, 0xF0, 0x79, 0x98, 0x40, 0x42, 0x86, 0xAB, 0x92, 0xE6, 0x5B, 0xE0, 0x88, 0x5F, 0x95 };
+        private static readonly byte[] SYSTEM_ID_PLAYREADY = [0x9A, 0x04, 0xF0, 0x79, 0x98, 0x40, 0x42, 0x86, 0xAB, 0x92, 0xE6, 0x5B, 0xE0, 0x88, 0x5F, 0x95];
 
         public static ParsedMP4Info ReadInit(byte[] data)
         {
             var info = new ParsedMP4Info();
 
-            //parse init
+            // parse init
             new MP4Parser()
                 .Box("moov", MP4Parser.Children)
                 .Box("trak", MP4Parser.Children)
@@ -28,22 +27,20 @@ namespace Mp4SubtitleParser
                 .Box("minf", MP4Parser.Children)
                 .Box("stbl", MP4Parser.Children)
                 .FullBox("stsd", MP4Parser.SampleDescription)
-                .FullBox("pssh", (box) =>
+                .FullBox("pssh", box =>
                 {
-                    if (!(box.Version == 0 || box.Version == 1))
+                    if (box.Version is not (0 or 1))
                         throw new Exception("PSSH version can only be 0 or 1");
                     var systemId = box.Reader.ReadBytes(16);
-                    if (SYSTEM_ID_WIDEVINE.SequenceEqual(systemId))
+                    if (!SYSTEM_ID_WIDEVINE.SequenceEqual(systemId)) return;
-                    {
+                    
                     var dataSize = box.Reader.ReadUInt32();
                     var psshData = box.Reader.ReadBytes((int)dataSize);
                     info.PSSH = Convert.ToBase64String(psshData);
-                        if (info.KID == "00000000000000000000000000000000")
+                    if (info.KID != "00000000000000000000000000000000") return;
-                        {
+                    
                     info.KID = HexUtil.BytesToHex(psshData[2..18]).ToLower();
                     info.isMultiDRM = true;
-                        }
-                    }
                 })
                 .FullBox("encv", MP4Parser.AllData(data => ReadBox(data, info)))
                 .FullBox("enca", MP4Parser.AllData(data => ReadBox(data, info)))
@@ -56,12 +53,12 @@ namespace Mp4SubtitleParser
 
         private static void ReadBox(byte[] data, ParsedMP4Info info)
         {
-            //find schm 
+            // find schm 
-            var schmBytes = new byte[4] { 0x73, 0x63, 0x68, 0x6d };
+            byte[] schmBytes = [0x73, 0x63, 0x68, 0x6d];
             var schmIndex = 0;
-            for (int i = 0; i < data.Length - 4; i++) 
+            for (var i = 0; i < data.Length - 4; i++) 
             {
-                if (new byte[4] { data[i], data[i + 1], data[i + 2], data[i + 3] }.SequenceEqual(schmBytes))
+                if (new[] { data[i], data[i + 1], data[i + 2], data[i + 3] }.SequenceEqual(schmBytes))
                 {
                     schmIndex = i;
                     break;
@@ -72,14 +69,14 @@ namespace Mp4SubtitleParser
                 info.Scheme = System.Text.Encoding.UTF8.GetString(data[schmIndex..][8..12]);
             }
 
-            //if (info.Scheme != "cenc") return;
+            // if (info.Scheme != "cenc") return;
 
-            //find KID
+            // find KID
-            var tencBytes = new byte[4] { 0x74, 0x65, 0x6E, 0x63 };
+            byte[] tencBytes = [0x74, 0x65, 0x6E, 0x63];
             var tencIndex = -1;
             for (int i = 0; i < data.Length - 4; i++)
             {
-                if (new byte[4] { data[i], data[i + 1], data[i + 2], data[i + 3] }.SequenceEqual(tencBytes))
+                if (new[] { data[i], data[i + 1], data[i + 2], data[i + 3] }.SequenceEqual(tencBytes))
                 {
                     tencIndex = i;
                     break;

src/N_m3u8DL-RE.Parser/Mp4/MP4Parser.cs

@@ -9,12 +9,12 @@ namespace Mp4SubtitleParser
 {
     class ParsedBox
     {
-        public MP4Parser Parser { get; set; }
+        public required MP4Parser Parser { get; set; }
         public bool PartialOkay { get; set; }
         public long Start { get; set; }
         public uint Version { get; set; } = 1000;
         public uint Flags { get; set; } = 1000;
-        public BinaryReader2 Reader { get; set; }
+        public required BinaryReader2 Reader { get; set; }
         public bool Has64BitSize { get; set; }
     }
 
@@ -28,7 +28,7 @@ namespace Mp4SubtitleParser
     class TRUN
     {
         public uint SampleCount { get; set; }
-        public List<Sample> SampleData { get; set; } = new List<Sample>();
+        public List<Sample> SampleData { get; set; } = [];
     }
 
     class Sample
@@ -55,7 +55,7 @@ namespace Mp4SubtitleParser
 
         public static BoxHandler AllData(DataHandler handler)
         {
-            return (box) =>
+            return box =>
             {
                 var all = box.Reader.GetLength() - box.Reader.GetPosition();
                 handler(box.Reader.ReadBytes((int)all));
@@ -111,7 +111,7 @@ namespace Mp4SubtitleParser
             var name = TypeToString(type);
             var has64BitSize = false;
 
-            //Console.WriteLine($"Parsing MP4 box: {name}");
+            // Console.WriteLine($"Parsing MP4 box: {name}");
 
             switch (size)
             {
@@ -129,8 +129,7 @@ namespace Mp4SubtitleParser
                     break;
             }
 
-            BoxHandler boxDefinition = null;
+            this.BoxDefinitions.TryGetValue(type, out BoxHandler? boxDefinition);
-            this.BoxDefinitions.TryGetValue(type, out boxDefinition);
 
             if (boxDefinition != null)
             {
@@ -162,7 +161,7 @@ namespace Mp4SubtitleParser
                 }
 
                 int payloadSize = (int)(end - reader.GetPosition());
-                var payload = (payloadSize > 0) ? reader.ReadBytes(payloadSize) : new byte[0];
+                var payload = (payloadSize > 0) ? reader.ReadBytes(payloadSize) : [];
                 var box = new ParsedBox()
                 {
                     Parser = this,

src/N_m3u8DL-RE.Parser/Mp4/MP4TtmlUtil.cs

@@ -3,15 +3,15 @@ using System.Text;
 using System.Text.RegularExpressions;
 using System.Xml;
 
-namespace Mp4SubtitleParser
+namespace Mp4SubtitleParser;
+
+class SubEntity
 {
-    class SubEntity
+    public required string Begin { get; set; }
-    {
+    public required string End { get; set; }
-        public string Begin { get; set; }
+    public required string Region { get; set; }
-        public string End { get; set; }
+    public List<XmlElement> Contents { get; set; } = [];
-        public string Region { get; set; }
+    public List<string> ContentStrings { get; set; } = [];
-        public List<XmlElement> Contents { get; set; } = new List<XmlElement>();
-        public List<string> ContentStrings { get; set; } = new List<string>();
 
     public override bool Equals(object? obj)
     {
@@ -26,15 +26,15 @@ namespace Mp4SubtitleParser
     {
         return HashCode.Combine(Begin, End, Region, ContentStrings);
     }
-    }
+}
 
-    public partial class MP4TtmlUtil
+public static partial class MP4TtmlUtil
-    {
+{
     [GeneratedRegex(" \\w+:\\w+=\\\"[^\\\"]*\\\"")]
     private static partial Regex AttrRegex();
     [GeneratedRegex("<p.*?>(.+?)<\\/p>")]
     private static partial Regex LabelFixRegex();
-        [GeneratedRegex("\\<tt[\\s\\S]*?\\<\\/tt\\>")]
+    [GeneratedRegex(@"\<tt[\s\S]*?\<\/tt\>")]
     private static partial Regex MultiElementsFixRegex();
     [GeneratedRegex("\\<smpte:image.*xml:id=\\\"(.*?)\\\".*\\>([\\s\\S]*?)<\\/smpte:image>")]
     private static partial Regex ImageRegex();
@@ -43,7 +43,7 @@ namespace Mp4SubtitleParser
     {
         bool sawSTPP = false;
 
-            //parse init
+        // parse init
         new MP4Parser()
             .Box("moov", MP4Parser.Children)
             .Box("trak", MP4Parser.Children)
@@ -51,7 +51,7 @@ namespace Mp4SubtitleParser
             .Box("minf", MP4Parser.Children)
             .Box("stbl", MP4Parser.Children)
             .FullBox("stsd", MP4Parser.SampleDescription)
-                .Box("stpp", (box) => {
+            .Box("stpp", box => {
                 sawSTPP = true;
             })
             .Parse(data);
@@ -65,7 +65,7 @@ namespace Mp4SubtitleParser
         {
             var dt = DateTime.ParseExact(xmlTime, "HH:mm:ss.fff", System.Globalization.CultureInfo.InvariantCulture);
             var ts = TimeSpan.FromMilliseconds(dt.TimeOfDay.TotalMilliseconds + segTimeMs * index);
-                return string.Format("{0:00}:{1:00}:{2:00}.{3:000}", ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds);
+            return $"{ts.Hours:00}:{ts.Minutes:00}:{ts.Seconds:00}.{ts.Milliseconds:000}";
         }
 
         if (!xmlSrc.Contains("<tt") || !xmlSrc.Contains("<head>")) return xmlSrc;
@@ -85,12 +85,12 @@ namespace Mp4SubtitleParser
             return xmlSrc;
 
         var _div = bodyNode.SelectSingleNode("ns:div", nsMgr);
-            //Parse <p> label
+        // Parse <p> label
         foreach (XmlElement _p in _div!.SelectNodes("ns:p", nsMgr)!)
         {
             var _begin = _p.GetAttribute("begin");
             var _end = _p.GetAttribute("end");
-                //Handle namespace
+            // Handle namespace
             foreach (XmlAttribute attr in _p.Attributes)
             {
                 if (attr.LocalName == "begin") _begin = attr.Value;
@@ -98,8 +98,8 @@ namespace Mp4SubtitleParser
             }
             _p.SetAttribute("begin", Add(_begin));
             _p.SetAttribute("end", Add(_end));
-                //Console.WriteLine($"{_begin} {_p.GetAttribute("begin")}");
+            // Console.WriteLine($"{_begin} {_p.GetAttribute("begin")}");
-                //Console.WriteLine($"{_end} {_p.GetAttribute("begin")}");
+            // Console.WriteLine($"{_end} {_p.GetAttribute("begin")}");
         }
 
         return xmlDoc.OuterXml;
@@ -114,7 +114,7 @@ namespace Mp4SubtitleParser
             {
                 sb.Append(item.InnerText.Trim());
             }
-                else if(item.NodeType == XmlNodeType.Element && item.Name == "br")
+            else if(item is { NodeType: XmlNodeType.Element, Name: "br" })
             {
                 sb.AppendLine();
             }
@@ -122,30 +122,29 @@ namespace Mp4SubtitleParser
         return sb.ToString();
     }
 
-        public static List<string> SplitMultipleRootElements(string xml)
+    private static List<string> SplitMultipleRootElements(string xml)
     {
-            if (!MultiElementsFixRegex().IsMatch(xml)) return new List<string>();
+        return !MultiElementsFixRegex().IsMatch(xml) ? [] : MultiElementsFixRegex().Matches(xml).Select(m => m.Value).ToList();
-            return MultiElementsFixRegex().Matches(xml).Select(m => m.Value).ToList();
     }
 
     public static WebVttSub ExtractFromMp4(string item, long segTimeMs, long baseTimestamp = 0L)
     {
-            return ExtractFromMp4s(new string[] { item }, segTimeMs, baseTimestamp);
+        return ExtractFromMp4s([item], segTimeMs, baseTimestamp);
     }
 
-        public static WebVttSub ExtractFromMp4s(IEnumerable<string> items, long segTimeMs, long baseTimestamp = 0L)
+    private static WebVttSub ExtractFromMp4s(IEnumerable<string> items, long segTimeMs, long baseTimestamp = 0L)
     {
-            //read ttmls
+        // read ttmls
-            List<string> xmls = new List<string>();
+        List<string> xmls = [];
         int segIndex = 0;
         foreach (var item in items)
         {
             var dataSeg = File.ReadAllBytes(item);
 
             var sawMDAT = false;
-                //parse media
+            // parse media
             new MP4Parser()
-                    .Box("mdat", MP4Parser.AllData((data) =>
+                .Box("mdat", MP4Parser.AllData(data =>
                 {
                     sawMDAT = true;
                     // Join this to any previous payload, in case the mp4 has multiple
@@ -161,10 +160,7 @@ namespace Mp4SubtitleParser
                     else
                     {
                         var datas = SplitMultipleRootElements(Encoding.UTF8.GetString(data));
-                            foreach (var item in datas)
+                        xmls.AddRange(datas);
-                            {
-                                xmls.Add(item);
-                            }
                     }
                 }))
                 .Parse(dataSeg,/* partialOkay= */ false);
@@ -176,25 +172,18 @@ namespace Mp4SubtitleParser
 
     public static WebVttSub ExtractFromTTML(string item, long segTimeMs, long baseTimestamp = 0L)
     {
-            return ExtractFromTTMLs(new string[] { item }, segTimeMs, baseTimestamp);
+        return ExtractFromTTMLs([item], segTimeMs, baseTimestamp);
     }
 
     public static WebVttSub ExtractFromTTMLs(IEnumerable<string> items, long segTimeMs, long baseTimestamp = 0L)
     {
-            //read ttmls
+        // read ttmls
-            List<string> xmls = new List<string>();
+        List<string> xmls = [];
         int segIndex = 0;
         foreach (var item in items)
         {
             var xml = File.ReadAllText(item);
-                if (segTimeMs != 0)
+            xmls.Add(segTimeMs != 0 ? ShiftTime(xml, segTimeMs, segIndex) : xml);
-                {
-                    xmls.Add(ShiftTime(xml, segTimeMs, segIndex));
-                }
-                else
-                {
-                    xmls.Add(xml);
-                }
             segIndex++;
         }
 
@@ -203,7 +192,7 @@ namespace Mp4SubtitleParser
 
     private static WebVttSub ExtractSub(List<string> xmls, long baseTimestamp)
     {
-            //parsing
+        // parsing
         var xmlDoc = new XmlDocument();
         var finalSubs = new List<SubEntity>();
         XmlNode? headNode = null;
@@ -215,7 +204,7 @@ namespace Mp4SubtitleParser
             var xmlContent = item;
             if (!xmlContent.Contains("<tt")) continue;
 
-                //fix non-standard xml 
+            // fix non-standard xml 
             var xmlContentFix = xmlContent;
             if (regex.IsMatch(xmlContent))
             {
@@ -256,8 +245,8 @@ namespace Mp4SubtitleParser
                 continue;
 
 
-                //PNG Subs
+            // PNG Subs
-                var imageDic = new Dictionary<string, string>(); //id, Base64
+            var imageDic = new Dictionary<string, string>(); // id, Base64
             if (ImageRegex().IsMatch(xmlDoc.InnerXml))
             {
                 foreach (Match img in ImageRegex().Matches(xmlDoc.InnerXml))
@@ -266,7 +255,7 @@ namespace Mp4SubtitleParser
                 }
             }
 
-                //convert <div> to <p>
+            // convert <div> to <p>
             if (_div!.SelectNodes("ns:p", nsMgr) == null || _div!.SelectNodes("ns:p", nsMgr)!.Count == 0)
             {
                 foreach (XmlElement _tDiv in bodyNode.SelectNodes("ns:div", nsMgr)!)
@@ -277,14 +266,14 @@ namespace Mp4SubtitleParser
                 }
             }
 
-                //Parse <p> label
+            // Parse <p> label
             foreach (XmlElement _p in _div!.SelectNodes("ns:p", nsMgr)!)
             {
                 var _begin = _p.GetAttribute("begin");
                 var _end = _p.GetAttribute("end");
                 var _region = _p.GetAttribute("region");
                 var _bgImg = _p.GetAttribute("smpte:backgroundImage");
-                    //Handle namespace
+                // Handle namespace
                 foreach (XmlAttribute attr in _p.Attributes)
                 {
                     if (attr.LocalName == "begin") _begin = attr.Value;
@@ -301,7 +290,7 @@ namespace Mp4SubtitleParser
                 if (string.IsNullOrEmpty(_bgImg))
                 {
                     var _spans = _p.ChildNodes;
-                        //Collect <span>
+                    // Collect <span>
                     foreach (XmlNode _node in _spans)
                     {
                         if (_node.NodeType == XmlNodeType.Element)
@@ -324,28 +313,27 @@ namespace Mp4SubtitleParser
                 else
                 {
                     var id = _bgImg.Replace("#", "");
-                        if (imageDic.ContainsKey(id))
+                    if (imageDic.TryGetValue(id, out var value))
                     {
                         var _span = new XmlDocument().CreateElement("span");
-                            _span.InnerText = $"Base64::{imageDic[id]}";
+                        _span.InnerText = $"Base64::{value}";
                         sub.Contents.Add(_span);
                         sub.ContentStrings.Add(_span.OuterXml);
                     }
                 }
                     
-                    //Check if one <p> has been splitted
+                // Check if one <p> has been splitted
                 var index = finalSubs.FindLastIndex(s => s.End == _begin && s.Region == _region && s.ContentStrings.SequenceEqual(sub.ContentStrings));
-                    //Skip empty lines
+                // Skip empty lines
-                    if (sub.ContentStrings.Count > 0)
+                if (sub.ContentStrings.Count <= 0)
-                    {
+                    continue;
-                        //Extend <p> duration
+                // Extend <p> duration
                 if (index != -1)
                     finalSubs[index].End = sub.End;
                 else if (!finalSubs.Contains(sub))
                     finalSubs.Add(sub);
             }
         }
-            }
 
 
         var dic = new Dictionary<string, string>();
@@ -372,7 +360,7 @@ namespace Mp4SubtitleParser
         }
 
 
-            StringBuilder vtt = new StringBuilder();
+        var vtt = new StringBuilder();
         vtt.AppendLine("WEBVTT");
         foreach (var item in dic)
         {
@@ -383,5 +371,4 @@ namespace Mp4SubtitleParser
 
         return WebVttSub.Parse(vtt.ToString(), baseTimestamp);
     }
-    }
 }

src/N_m3u8DL-RE.Parser/Mp4/MP4VttUtil.cs

@@ -1,30 +1,30 @@
 using N_m3u8DL_RE.Common.Entity;
 using System.Text;
 
-namespace Mp4SubtitleParser
+namespace Mp4SubtitleParser;
+
+public static class MP4VttUtil
 {
-    public class MP4VttUtil
-    {
     public static (bool, uint) CheckInit(byte[] data)
     {
         uint timescale = 0;
         bool sawWVTT = false;
 
-            //parse init
+        // parse init
         new MP4Parser()
             .Box("moov", MP4Parser.Children)
             .Box("trak", MP4Parser.Children)
             .Box("mdia", MP4Parser.Children)
-                .FullBox("mdhd", (box) =>
+            .FullBox("mdhd", box =>
             {
-                    if (!(box.Version == 0 || box.Version == 1))
+                if (box.Version is not (0 or 1))
                     throw new Exception("MDHD version can only be 0 or 1");
                 timescale = MP4Parser.ParseMDHD(box.Reader, box.Version);
             })
             .Box("minf", MP4Parser.Children)
             .Box("stbl", MP4Parser.Children)
             .FullBox("stsd", MP4Parser.SampleDescription)
-                .Box("wvtt", (box) => {
+            .Box("wvtt", _ => {
                 // A valid vtt init segment, though we have no actual subtitles yet.
                 sawWVTT = true;
             })
@@ -38,7 +38,7 @@ namespace Mp4SubtitleParser
         if (timescale == 0)
             throw new Exception("Missing timescale for VTT content!");
 
-            List<SubCue> cues = new();
+        List<SubCue> cues = [];
 
         foreach (var item in files)
         {
@@ -50,27 +50,27 @@ namespace Mp4SubtitleParser
             byte[]? rawPayload = null;
             ulong baseTime = 0;
             ulong defaultDuration = 0;
-                List<Sample> presentations = new();
+            List<Sample> presentations = [];
 
 
-                //parse media
+            // parse media
             new MP4Parser()
                 .Box("moof", MP4Parser.Children)
                 .Box("traf", MP4Parser.Children)
-                    .FullBox("tfdt", (box) =>
+                .FullBox("tfdt", box =>
                 {
                     sawTFDT = true;
-                        if (!(box.Version == 0 || box.Version == 1))
+                    if (box.Version is not (0 or 1))
                         throw new Exception("TFDT version can only be 0 or 1");
                     baseTime = MP4Parser.ParseTFDT(box.Reader, box.Version);
                 })
-                    .FullBox("tfhd", (box) =>
+                .FullBox("tfhd", box =>
                 {
                     if (box.Flags == 1000)
                         throw new Exception("A TFHD box should have a valid flags value");
                     defaultDuration = MP4Parser.ParseTFHD(box.Reader, box.Flags).DefaultSampleDuration;
                 })
-                    .FullBox("trun", (box) =>
+                .FullBox("trun", box =>
                 {
                     sawTRUN = true;
                     if (box.Version == 1000)
@@ -79,7 +79,7 @@ namespace Mp4SubtitleParser
                         throw new Exception("A TRUN box should have a valid flags value");
                     presentations = MP4Parser.ParseTRUN(box.Reader, box.Version, box.Flags).SampleData;
                 })
-                    .Box("mdat", MP4Parser.AllData((data) =>
+                .Box("mdat", MP4Parser.AllData(data =>
                 {
                     if (sawMDAT)
                         throw new Exception("VTT cues in mp4 with multiple MDAT are not currently supported");
@@ -139,13 +139,11 @@ namespace Mp4SubtitleParser
                     {
                         if (payload != null)
                         {
-                                if (timescale == 0)
-                                    throw new Exception("Timescale should not be zero!");
                             var cue = ParseVTTC(
                                 payload,
                                 0 + (double)startTime / timescale,
                                 0 + (double)currentTime / timescale);
-                                //Check if same subtitle has been splitted
+                            // Check if same subtitle has been splitted
                             if (cue != null)
                             {
                                 var index = cues.FindLastIndex(s => s.EndTime == cue.StartTime && s.Settings == cue.Settings && s.Payload == cue.Payload);
@@ -174,7 +172,7 @@ namespace Mp4SubtitleParser
 
                 if (reader.HasMoreData())
                 {
-                        //throw new Exception("MDAT which contain VTT cues and non-VTT data are not currently supported!");
+                    // throw new Exception("MDAT which contain VTT cues and non-VTT data are not currently supported!");
                 }
             }
         }
@@ -192,15 +190,15 @@ namespace Mp4SubtitleParser
         string id = string.Empty;
         string settings = string.Empty;
         new MP4Parser()
-                .Box("payl", MP4Parser.AllData((data) =>
+            .Box("payl", MP4Parser.AllData(data =>
             {
                 payload = Encoding.UTF8.GetString(data);
             }))
-                .Box("iden", MP4Parser.AllData((data) =>
+            .Box("iden", MP4Parser.AllData(data =>
             {
                 id = Encoding.UTF8.GetString(data);
             }))
-                .Box("sttg", MP4Parser.AllData((data) =>
+            .Box("sttg", MP4Parser.AllData(data =>
             {
                 settings = Encoding.UTF8.GetString(data);
             }))
@@ -212,5 +210,4 @@ namespace Mp4SubtitleParser
         }
         return null;
     }
-    }
 }

src/N_m3u8DL-RE.Parser/Mp4/MSSMoovProcessor.cs

@@ -4,16 +4,16 @@ using N_m3u8DL_RE.Common.Util;
 using System.Text;
 using System.Text.RegularExpressions;
 
-//https://github.com/canalplus/rx-player/blob/48d1f845064cea5c5a3546d2c53b1855c2be149d/src/parsers/manifest/smooth/get_codecs.ts
+// https://github.com/canalplus/rx-player/blob/48d1f845064cea5c5a3546d2c53b1855c2be149d/src/parsers/manifest/smooth/get_codecs.ts
-//https://github.dev/Dash-Industry-Forum/dash.js/blob/2aad3e79079b4de0bcd961ce6b4957103d98a621/src/mss/MssFragmentMoovProcessor.js
+// https://github.dev/Dash-Industry-Forum/dash.js/blob/2aad3e79079b4de0bcd961ce6b4957103d98a621/src/mss/MssFragmentMoovProcessor.js
-//https://github.com/yt-dlp/yt-dlp/blob/3639df54c3298e35b5ae2a96a25bc4d3c38950d0/yt_dlp/downloader/ism.py
+// https://github.com/yt-dlp/yt-dlp/blob/3639df54c3298e35b5ae2a96a25bc4d3c38950d0/yt_dlp/downloader/ism.py
-//https://github.com/google/ExoPlayer/blob/a9444c880230d2c2c79097e89259ce0b9f80b87d/library/extractor/src/main/java/com/google/android/exoplayer2/video/HevcConfig.java#L38
+// https://github.com/google/ExoPlayer/blob/a9444c880230d2c2c79097e89259ce0b9f80b87d/library/extractor/src/main/java/com/google/android/exoplayer2/video/HevcConfig.java#L38
-//https://github.com/sannies/mp4parser/blob/master/isoparser/src/main/java/org/mp4parser/boxes/iso14496/part15/HevcDecoderConfigurationRecord.java
+// https://github.com/sannies/mp4parser/blob/master/isoparser/src/main/java/org/mp4parser/boxes/iso14496/part15/HevcDecoderConfigurationRecord.java
-namespace N_m3u8DL_RE.Parser.Mp4
+namespace N_m3u8DL_RE.Parser.Mp4;
+
+public partial class MSSMoovProcessor
 {
-    public partial class MSSMoovProcessor
+    [GeneratedRegex(@"\<KID\>(.*?)\<")]
-    {
-        [GeneratedRegex("\\<KID\\>(.*?)\\<")]
     private static partial Regex KIDRegex();
 
     private static string StartCode = "00000001";
@@ -23,9 +23,9 @@ namespace N_m3u8DL_RE.Parser.Mp4
     private string CodecPrivateData;
     private int Timesacle;
     private long Duration;
-        private string Language { get => StreamSpec.Language ?? "und"; }
+    private string Language => StreamSpec.Language ?? "und";
-        private int Width { get => int.Parse((StreamSpec.Resolution ?? "0x0").Split('x').First()); }
+    private int Width => int.Parse((StreamSpec.Resolution ?? "0x0").Split('x').First());
-        private int Height { get => int.Parse((StreamSpec.Resolution ?? "0x0").Split('x').Last()); }
+    private int Height => int.Parse((StreamSpec.Resolution ?? "0x0").Split('x').Last());
     private string StreamType;
     private int Channels;
     private int BitsPerSample;
@@ -36,8 +36,8 @@ namespace N_m3u8DL_RE.Parser.Mp4
     private bool IsProtection;
     private string ProtectionSystemId;
     private string ProtectionData;
-        private string ProtecitonKID;
+    private string? ProtectionKID;
-        private string ProtecitonKID_PR;
+    private string? ProtectionKID_PR;
     private byte[] UnityMatrix
     {
         get
@@ -60,10 +60,9 @@ namespace N_m3u8DL_RE.Parser.Mp4
     private static byte TRACK_IN_MOVIE = 0x2;
     private static byte TRACK_IN_PREVIEW = 0x4;
     private static byte SELF_CONTAINED = 0x1;
-        private static List<string> SupportedFourCC = new List<string>()
+
-        {
+    private static List<string> SupportedFourCC =
-            "HVC1","HEV1","AACL","AACH","EC-3","H264","AVC1","DAVC","AVC1","TTML","DVHE","DVH1"
+        ["HVC1", "HEV1", "AACL", "AACH", "EC-3", "H264", "AVC1", "DAVC", "AVC1", "TTML", "DVHE", "DVH1"];
-        };
 
     public MSSMoovProcessor(StreamSpec streamSpec)
     {
@@ -82,20 +81,20 @@ namespace N_m3u8DL_RE.Parser.Mp4
         this.ProtectionData = data.ProtectionData;
         this.ProtectionSystemId = data.ProtectionSystemID;
 
-            //需要手动生成CodecPrivateData
+        // 需要手动生成CodecPrivateData
         if (string.IsNullOrEmpty(CodecPrivateData))
         {
             GenCodecPrivateDataForAAC();
         }
 
-            //解析KID
+        // 解析KID
         if (IsProtection)
         {
             ExtractKID();
         }
     }
 
-        private static string[] HEVC_GENERAL_PROFILE_SPACE_STRINGS = new string[] { "", "A", "B", "C" };
+    private static string[] HEVC_GENERAL_PROFILE_SPACE_STRINGS = ["", "A", "B", "C"];
     private int SamplingFrequencyIndex(int samplingRate) => samplingRate switch
     {
         96000 => 0x0,
@@ -116,7 +115,7 @@ namespace N_m3u8DL_RE.Parser.Mp4
 
     private void GenCodecPrivateDataForAAC()
     {
-            var objectType = 0x02; //AAC Main Low Complexity => object Type = 2
+        var objectType = 0x02; // AAC Main Low Complexity => object Type = 2
         var indexFreq = SamplingFrequencyIndex(SamplingRate);
 
         if (FourCC == "AACH")
@@ -127,17 +126,17 @@ namespace N_m3u8DL_RE.Parser.Mp4
             var codecPrivateData = new byte[4];
             var extensionSamplingFrequencyIndex = SamplingFrequencyIndex(SamplingRate * 2); // in HE AAC Extension Sampling frequence
             // equals to SamplingRate*2
-                //Freq Index is present for 3 bits in the first byte, last bit is in the second
+            // Freq Index is present for 3 bits in the first byte, last bit is in the second
             codecPrivateData[0] = (byte)((objectType << 3) | (indexFreq >> 1));
             codecPrivateData[1] = (byte)((indexFreq << 7) | (Channels << 3) | (extensionSamplingFrequencyIndex >> 1));
             codecPrivateData[2] = (byte)((extensionSamplingFrequencyIndex << 7) | (0x02 << 2)); // origin object type equals to 2 => AAC Main Low Complexity
-                codecPrivateData[3] = 0x0; //alignment bits
+            codecPrivateData[3] = 0x0; // alignment bits
 
             var arr16 = new ushort[2];
             arr16[0] = (ushort)((codecPrivateData[0] << 8) + codecPrivateData[1]);
             arr16[1] = (ushort)((codecPrivateData[2] << 8) + codecPrivateData[3]);
 
-                //convert decimal to hex value
+            // convert decimal to hex value
             this.CodecPrivateData = HexUtil.BytesToHex(BitConverter.GetBytes(arr16[0])).PadLeft(16, '0');
             this.CodecPrivateData += HexUtil.BytesToHex(BitConverter.GetBytes(arr16[1])).PadLeft(16, '0');
         }
@@ -146,36 +145,36 @@ namespace N_m3u8DL_RE.Parser.Mp4
             // 2 bytes :     XXXXX         XXXX          XXXX              XXX
             //           ' ObjectType' 'Freq Index' 'Channels value'   'GAS = 000'
             var codecPrivateData = new byte[2];
-                //Freq Index is present for 3 bits in the first byte, last bit is in the second
+            // Freq Index is present for 3 bits in the first byte, last bit is in the second
             codecPrivateData[0] = (byte)((objectType << 3) | (indexFreq >> 1));
             codecPrivateData[1] = (byte)((indexFreq << 7) | Channels << 3);
             // put the 2 bytes in an 16 bits array
             var arr16 = new ushort[1];
             arr16[0] = (ushort)((codecPrivateData[0] << 8) + codecPrivateData[1]);
 
-                //convert decimal to hex value
+            // convert decimal to hex value
             this.CodecPrivateData = HexUtil.BytesToHex(BitConverter.GetBytes(arr16[0])).PadLeft(16, '0');
         }
     }
 
     private void ExtractKID()
     {
-            //playready
+        // playready
         if (ProtectionSystemId.ToUpper() == "9A04F079-9840-4286-AB92-E65BE0885F95")
         {
             var bytes = HexUtil.HexToBytes(ProtectionData.Replace("00", ""));
             var text = Encoding.ASCII.GetString(bytes);
             var kidBytes = Convert.FromBase64String(KIDRegex().Match(text).Groups[1].Value);
-                //save kid for playready
+            // save kid for playready
-                this.ProtecitonKID_PR = HexUtil.BytesToHex(kidBytes);
+            this.ProtectionKID_PR = HexUtil.BytesToHex(kidBytes);
-                //fix byte order
+            // fix byte order
-                var reverse1 = new byte[4] { kidBytes[3], kidBytes[2], kidBytes[1], kidBytes[0] };
+            var reverse1 = new[] { kidBytes[3], kidBytes[2], kidBytes[1], kidBytes[0] };
-                var reverse2 = new byte[4] { kidBytes[5], kidBytes[4], kidBytes[7], kidBytes[6] };
+            var reverse2 = new[] { kidBytes[5], kidBytes[4], kidBytes[7], kidBytes[6] };
             Array.Copy(reverse1, 0, kidBytes, 0, reverse1.Length);
             Array.Copy(reverse2, 0, kidBytes, 4, reverse1.Length);
-                this.ProtecitonKID = HexUtil.BytesToHex(kidBytes);
+            this.ProtectionKID = HexUtil.BytesToHex(kidBytes);
         }
-            //widevine
+        // widevine
         else if (ProtectionSystemId.ToUpper() == "EDEF8BA9-79D6-4ACE-A3C8-27DCD51D21ED")
         {
             throw new NotSupportedException();
@@ -216,19 +215,19 @@ namespace N_m3u8DL_RE.Parser.Mp4
         sinfPayload.AddRange(frmaBox);
 
         var schmPayload = new List<byte>();
-            schmPayload.AddRange(Encoding.ASCII.GetBytes("cenc")); //scheme_type 'cenc' => common encryption
+        schmPayload.AddRange(Encoding.ASCII.GetBytes("cenc")); // scheme_type 'cenc' => common encryption
-            schmPayload.AddRange(new byte[] { 0, 1, 0, 0 }); //scheme_version Major version 1, Minor version 0
+        schmPayload.AddRange([0, 1, 0, 0]); // scheme_version Major version 1, Minor version 0
         var schmBox = FullBox("schm", 0, 0, schmPayload.ToArray());
 
         sinfPayload.AddRange(schmBox);
 
         var tencPayload = new List<byte>();
-            tencPayload.AddRange(new byte[] { 0, 0 });
+        tencPayload.AddRange([0, 0]);
-            tencPayload.Add(0x1); //default_IsProtected
+        tencPayload.Add(0x1); // default_IsProtected
-            tencPayload.Add(0x8); //default_Per_Sample_IV_size
+        tencPayload.Add(0x8); // default_Per_Sample_IV_size
-            tencPayload.AddRange(HexUtil.HexToBytes(ProtecitonKID)); //default_KID
+        tencPayload.AddRange(HexUtil.HexToBytes(ProtectionKID)); // default_KID
-            //tencPayload.Add(0x8);//default_constant_IV_size
+        // tencPayload.Add(0x8);// default_constant_IV_size
-            //tencPayload.AddRange(new byte[8]);//default_constant_IV
+        // tencPayload.AddRange(new byte[8]);// default_constant_IV
         var tencBox = FullBox("tenc", 0, 0, tencPayload.ToArray());
 
         var schiBox = Box("schi", tencBox);
@@ -244,12 +243,12 @@ namespace N_m3u8DL_RE.Parser.Mp4
         using var stream = new MemoryStream();
         using var writer = new BinaryWriter2(stream);
 
-            writer.Write("isml"); //major brand
+        writer.Write("isml"); // major brand
-            writer.WriteUInt(1); //minor version
+        writer.WriteUInt(1); // minor version
-            writer.Write("iso5"); //compatible brand
+        writer.Write("iso5"); // compatible brand
-            writer.Write("iso6"); //compatible brand
+        writer.Write("iso6"); // compatible brand
-            writer.Write("piff"); //compatible brand
+        writer.Write("piff"); // compatible brand
-            writer.Write("msdh"); //compatible brand
+        writer.Write("msdh"); // compatible brand
 
         return Box("ftyp", stream.ToArray());
     }
@@ -259,26 +258,26 @@ namespace N_m3u8DL_RE.Parser.Mp4
         using var stream = new MemoryStream();
         using var writer = new BinaryWriter2(stream);
 
-            writer.WriteULong(CreationTime); //creation_time
+        writer.WriteULong(CreationTime); // creation_time
-            writer.WriteULong(CreationTime); //modification_time
+        writer.WriteULong(CreationTime); // modification_time
-            writer.WriteUInt(Timesacle); //timescale
+        writer.WriteUInt(Timesacle); // timescale
-            writer.WriteULong(Duration); //duration
+        writer.WriteULong(Duration); // duration
-            writer.WriteUShort(1, padding: 2); //rate
+        writer.WriteUShort(1, padding: 2); // rate
-            writer.WriteByte(1, padding: 1); //volume
+        writer.WriteByte(1, padding: 1); // volume
-            writer.WriteUShort(0); //reserved
+        writer.WriteUShort(0); // reserved
         writer.WriteUInt(0);
         writer.WriteUInt(0);
 
         writer.Write(UnityMatrix);
 
-            writer.WriteUInt(0); //pre defined
+        writer.WriteUInt(0); // pre defined
         writer.WriteUInt(0);
         writer.WriteUInt(0);
         writer.WriteUInt(0);
         writer.WriteUInt(0);
         writer.WriteUInt(0);
 
-            writer.WriteUInt(0xffffffff); //next track id
+        writer.WriteUInt(0xffffffff); // next track id
 
 
         return FullBox("mvhd", 1, 0, stream.ToArray());
@@ -289,22 +288,22 @@ namespace N_m3u8DL_RE.Parser.Mp4
         using var stream = new MemoryStream();
         using var writer = new BinaryWriter2(stream);
 
-            writer.WriteULong(CreationTime); //creation_time
+        writer.WriteULong(CreationTime); // creation_time
-            writer.WriteULong(CreationTime); //modification_time
+        writer.WriteULong(CreationTime); // modification_time
-            writer.WriteUInt(TrackId); //track id
+        writer.WriteUInt(TrackId); // track id
-            writer.WriteUInt(0); //reserved
+        writer.WriteUInt(0); // reserved
-            writer.WriteULong(Duration); //duration
+        writer.WriteULong(Duration); // duration
-            writer.WriteUInt(0); //reserved
+        writer.WriteUInt(0); // reserved
         writer.WriteUInt(0);
-            writer.WriteShort(0); //layer
+        writer.WriteShort(0); // layer
-            writer.WriteShort(0); //alternate group
+        writer.WriteShort(0); // alternate group
-            writer.WriteByte(StreamType == "audio" ? (byte)1 : (byte)0, padding: 1); //volume
+        writer.WriteByte(StreamType == "audio" ? (byte)1 : (byte)0, padding: 1); // volume
-            writer.WriteUShort(0); //reserved
+        writer.WriteUShort(0); // reserved
 
         writer.Write(UnityMatrix);
 
-            writer.WriteUShort(Width, padding: 2); //width
+        writer.WriteUShort(Width, padding: 2); // width
-            writer.WriteUShort(Height, padding: 2); //height
+        writer.WriteUShort(Height, padding: 2); // height
 
         return FullBox("tkhd", 1, (uint)TRACK_ENABLED | TRACK_IN_MOVIE | TRACK_IN_PREVIEW, stream.ToArray());
     }
@@ -315,12 +314,12 @@ namespace N_m3u8DL_RE.Parser.Mp4
         using var stream = new MemoryStream();
         using var writer = new BinaryWriter2(stream);
 
-            writer.WriteULong(CreationTime); //creation_time
+        writer.WriteULong(CreationTime); // creation_time
-            writer.WriteULong(CreationTime); //modification_time
+        writer.WriteULong(CreationTime); // modification_time
-            writer.WriteUInt(Timesacle); //timescale
+        writer.WriteUInt(Timesacle); // timescale
-            writer.WriteULong(Duration); //duration
+        writer.WriteULong(Duration); // duration
-            writer.WriteUShort((Language[0] - 0x60) << 10 | (Language[1] - 0x60) << 5 | (Language[2] - 0x60)); //language
+        writer.WriteUShort((Language[0] - 0x60) << 10 | (Language[1] - 0x60) << 5 | (Language[2] - 0x60)); // language
-            writer.WriteUShort(0); //pre defined
+        writer.WriteUShort(0); // pre defined
 
         return FullBox("mdhd", 1, 0, stream.ToArray());
     }
@@ -330,16 +329,16 @@ namespace N_m3u8DL_RE.Parser.Mp4
         using var stream = new MemoryStream();
         using var writer = new BinaryWriter2(stream);
 
-            writer.WriteUInt(0); //pre defined
+        writer.WriteUInt(0); // pre defined
         if (StreamType == "audio") writer.Write("soun");
         else if (StreamType == "video") writer.Write("vide");
         else if (StreamType == "text") writer.Write("subt");
         else throw new NotSupportedException();
 
-            writer.WriteUInt(0); //reserved
+        writer.WriteUInt(0); // reserved
         writer.WriteUInt(0);
         writer.WriteUInt(0);
-            writer.Write($"{StreamSpec.GroupId ?? "RE Handler"}\0"); //name
+        writer.Write($"{StreamSpec.GroupId ?? "RE Handler"}\0"); // name
 
         return FullBox("hdlr", 0, 0, stream.ToArray());
     }
@@ -353,22 +352,22 @@ namespace N_m3u8DL_RE.Parser.Mp4
         if (StreamType == "audio")
         {
             var smhd = new List<byte>();
-                smhd.Add(0); smhd.Add(0); //balance
+            smhd.Add(0); smhd.Add(0); // balance
-                smhd.Add(0); smhd.Add(0); //reserved
+            smhd.Add(0); smhd.Add(0); // reserved
 
-                minfPayload.AddRange(FullBox("smhd", 0, 0, smhd.ToArray())); //Sound Media Header
+            minfPayload.AddRange(FullBox("smhd", 0, 0, smhd.ToArray())); // Sound Media Header
         }
         else if (StreamType == "video")
         {
             var vmhd = new List<byte>();
-                vmhd.Add(0); vmhd.Add(0); //graphics mode
+            vmhd.Add(0); vmhd.Add(0); // graphics mode
-                vmhd.Add(0); vmhd.Add(0); vmhd.Add(0); vmhd.Add(0); vmhd.Add(0); vmhd.Add(0);//opcolor
+            vmhd.Add(0); vmhd.Add(0); vmhd.Add(0); vmhd.Add(0); vmhd.Add(0); vmhd.Add(0);// opcolor
 
-                minfPayload.AddRange(FullBox("vmhd", 0, 1, vmhd.ToArray())); //Video Media Header
+            minfPayload.AddRange(FullBox("vmhd", 0, 1, vmhd.ToArray())); // Video Media Header
         }
         else if (StreamType == "text")
         {
-                minfPayload.AddRange(FullBox("sthd", 0, 0, new byte[0])); //Subtitle Media Header
+            minfPayload.AddRange(FullBox("sthd", 0, 0, [])); // Subtitle Media Header
         }
         else
         {
@@ -376,11 +375,11 @@ namespace N_m3u8DL_RE.Parser.Mp4
         }
 
         var drefPayload = new List<byte>();
-            drefPayload.Add(0); drefPayload.Add(0); drefPayload.Add(0); drefPayload.Add(1); //entry count
+        drefPayload.Add(0); drefPayload.Add(0); drefPayload.Add(0); drefPayload.Add(1); // entry count
-            drefPayload.AddRange(FullBox("url ", 0, SELF_CONTAINED, new byte[0])); //Data Entry URL Box
+        drefPayload.AddRange(FullBox("url ", 0, SELF_CONTAINED, [])); // Data Entry URL Box
 
-            var dinfPayload = FullBox("dref", 0, 0, drefPayload.ToArray()); //Data Reference Box
+        var dinfPayload = FullBox("dref", 0, 0, drefPayload.ToArray()); // Data Reference Box
-            minfPayload.AddRange(Box("dinf", dinfPayload.ToArray())); //Data Information Box
+        minfPayload.AddRange(Box("dinf", dinfPayload.ToArray())); // Data Information Box
 
         return minfPayload.ToArray();
     }
@@ -398,35 +397,35 @@ namespace N_m3u8DL_RE.Parser.Mp4
         // esdsLength = 34 + len(audioSpecificConfig)
 
         // ES_Descriptor (see ISO/IEC 14496-1 (Systems))
-            writer.WriteByte(0x03); //tag = 0x03 (ES_DescrTag)
+        writer.WriteByte(0x03); // tag = 0x03 (ES_DescrTag)
-            writer.WriteByte((byte)(20 + audioSpecificConfig.Length)); //size
+        writer.WriteByte((byte)(20 + audioSpecificConfig.Length)); // size
-            writer.WriteByte((byte)((TrackId & 0xFF00) >> 8)); //ES_ID = track_id
+        writer.WriteByte((byte)((TrackId & 0xFF00) >> 8)); // ES_ID = track_id
         writer.WriteByte((byte)(TrackId & 0x00FF));
-            writer.WriteByte(0); //flags and streamPriority
+        writer.WriteByte(0); // flags and streamPriority
 
         // DecoderConfigDescriptor (see ISO/IEC 14496-1 (Systems))
-            writer.WriteByte(0x04); //tag = 0x04 (DecoderConfigDescrTag)
+        writer.WriteByte(0x04); // tag = 0x04 (DecoderConfigDescrTag)
-            writer.WriteByte((byte)(15 + audioSpecificConfig.Length)); //size
+        writer.WriteByte((byte)(15 + audioSpecificConfig.Length)); // size
-            writer.WriteByte(0x40); //objectTypeIndication = 0x40 (MPEG-4 AAC)
+        writer.WriteByte(0x40); // objectTypeIndication = 0x40 (MPEG-4 AAC)
-            writer.WriteByte((0x05 << 2) | (0 << 1) | 1); //reserved = 1
+        writer.WriteByte((0x05 << 2) | (0 << 1) | 1); // reserved = 1
-            writer.WriteByte(0xFF); //buffersizeDB = undefined
+        writer.WriteByte(0xFF); // buffersizeDB = undefined
         writer.WriteByte(0xFF); 
         writer.WriteByte(0xFF);
 
         var bandwidth = StreamSpec.Bandwidth!;
-            writer.WriteByte((byte)((bandwidth & 0xFF000000) >> 24)); //maxBitrate
+        writer.WriteByte((byte)((bandwidth & 0xFF000000) >> 24)); // maxBitrate
         writer.WriteByte((byte)((bandwidth & 0x00FF0000) >> 16));
         writer.WriteByte((byte)((bandwidth & 0x0000FF00) >> 8));
         writer.WriteByte((byte)(bandwidth  & 0x000000FF));
-            writer.WriteByte((byte)((bandwidth & 0xFF000000) >> 24)); //avgbitrate
+        writer.WriteByte((byte)((bandwidth & 0xFF000000) >> 24)); // avgbitrate
         writer.WriteByte((byte)((bandwidth & 0x00FF0000) >> 16)); 
         writer.WriteByte((byte)((bandwidth & 0x0000FF00) >> 8));
         writer.WriteByte((byte)(bandwidth  & 0x000000FF));
 
         // DecoderSpecificInfo (see ISO/IEC 14496-1 (Systems))
-            writer.WriteByte(0x05); //tag = 0x05 (DecSpecificInfoTag)
+        writer.WriteByte(0x05); // tag = 0x05 (DecSpecificInfoTag)
-            writer.WriteByte((byte)audioSpecificConfig.Length); //size
+        writer.WriteByte((byte)audioSpecificConfig.Length); // size
-            writer.Write(audioSpecificConfig); //AudioSpecificConfig bytes
+        writer.Write(audioSpecificConfig); // AudioSpecificConfig bytes
 
         return FullBox("esds", 0, 0, stream.ToArray());
     }
@@ -436,23 +435,23 @@ namespace N_m3u8DL_RE.Parser.Mp4
         using var stream = new MemoryStream();
         using var writer = new BinaryWriter2(stream);
 
-            writer.WriteByte(0); //reserved
+        writer.WriteByte(0); // reserved
         writer.WriteByte(0);
         writer.WriteByte(0);
         writer.WriteByte(0);
         writer.WriteByte(0);
         writer.WriteByte(0);
-            writer.WriteUShort(1); //data reference index
+        writer.WriteUShort(1); // data reference index
 
         if (StreamType == "audio")
         {
-                writer.WriteUInt(0); //reserved2
+            writer.WriteUInt(0); // reserved2
             writer.WriteUInt(0);
-                writer.WriteUShort(Channels); //channels
+            writer.WriteUShort(Channels); // channels
-                writer.WriteUShort(BitsPerSample); //bits_per_sample
+            writer.WriteUShort(BitsPerSample); // bits_per_sample
-                writer.WriteUShort(0); //pre defined
+            writer.WriteUShort(0); // pre defined
-                writer.WriteUShort(0); //reserved3
+            writer.WriteUShort(0); // reserved3
-                writer.WriteUShort(SamplingRate, padding: 2); //sampling_rate
+            writer.WriteUShort(SamplingRate, padding: 2); // sampling_rate
 
             var audioSpecificConfig = HexUtil.HexToBytes(CodecPrivateData);
             var esdsBox = GenEsds(audioSpecificConfig);
@@ -464,128 +463,108 @@ namespace N_m3u8DL_RE.Parser.Mp4
                 {
                     var sinfBox = GenSinf("mp4a");
                     writer.Write(sinfBox);
-                        return Box("enca", stream.ToArray()); //Encrypted Audio
+                    return Box("enca", stream.ToArray()); // Encrypted Audio
                 }
-                    else
-                    {
                 return Box("mp4a", stream.ToArray());
             }
-                }
             if (FourCC == "EC-3")
             {
                 if (IsProtection)
                 {
                     var sinfBox = GenSinf("ec-3");
                     writer.Write(sinfBox);
-                        return Box("enca", stream.ToArray()); //Encrypted Audio
+                    return Box("enca", stream.ToArray()); // Encrypted Audio
                 }
-                    else
-                    {
                 return Box("ec-3", stream.ToArray());
             }
         }
-            }
         else if (StreamType == "video")
         {
-                writer.WriteUShort(0); //pre defined
+            writer.WriteUShort(0); // pre defined
-                writer.WriteUShort(0); //reserved
+            writer.WriteUShort(0); // reserved
-                writer.WriteUInt(0); //pre defined
+            writer.WriteUInt(0); // pre defined
             writer.WriteUInt(0);
             writer.WriteUInt(0);
-                writer.WriteUShort(Width); //width
+            writer.WriteUShort(Width); // width
-                writer.WriteUShort(Height); //height
+            writer.WriteUShort(Height); // height
-                writer.WriteUShort(0x48, padding: 2); //horiz resolution 72 dpi
+            writer.WriteUShort(0x48, padding: 2); // horiz resolution 72 dpi
-                writer.WriteUShort(0x48, padding: 2); //vert resolution 72 dpi
+            writer.WriteUShort(0x48, padding: 2); // vert resolution 72 dpi
-                writer.WriteUInt(0); //reserved
+            writer.WriteUInt(0); // reserved
-                writer.WriteUShort(1); //frame count
+            writer.WriteUShort(1); // frame count
-                for (int i = 0; i < 32; i++) //compressor name
+            for (int i = 0; i < 32; i++) // compressor name
             {
                 writer.WriteByte(0);
             }
-                writer.WriteUShort(0x18); //depth
+            writer.WriteUShort(0x18); // depth
-                writer.WriteUShort(65535); //pre defined
+            writer.WriteUShort(65535); // pre defined
 
             var codecPrivateData = HexUtil.HexToBytes(CodecPrivateData);
 
-                if (FourCC == "H264" || FourCC == "AVC1" || FourCC == "DAVC" || FourCC == "AVC1")
+            if (FourCC is "H264" or "AVC1" or "DAVC")
             {
-                    var arr = CodecPrivateData.Split(new[] { StartCode }, StringSplitOptions.RemoveEmptyEntries);
+                var arr = CodecPrivateData.Split([StartCode], StringSplitOptions.RemoveEmptyEntries);
-                    var sps = HexUtil.HexToBytes(arr.Where(x => (HexUtil.HexToBytes(x[0..2])[0] & 0x1F) == 7).First());
+                var sps = HexUtil.HexToBytes(arr.First(x => (HexUtil.HexToBytes(x[0..2])[0] & 0x1F) == 7));
-                    var pps = HexUtil.HexToBytes(arr.Where(x => (HexUtil.HexToBytes(x[0..2])[0] & 0x1F) == 8).First());
+                var pps = HexUtil.HexToBytes(arr.First(x => (HexUtil.HexToBytes(x[0..2])[0] & 0x1F) == 8));
-                    //make avcC
+                // make avcC
                 var avcC = GetAvcC(sps, pps);
                 writer.Write(avcC);
                 if (IsProtection)
                 {
                     var sinfBox = GenSinf("avc1");
                     writer.Write(sinfBox);
-                        return Box("encv", stream.ToArray()); //Encrypted Video
+                    return Box("encv", stream.ToArray()); // Encrypted Video
                 }
-                    else
+                return Box("avc1", stream.ToArray()); // AVC Simple Entry
+            }
+            if (FourCC is "HVC1" or "HEV1")
             {
-                        return Box("avc1", stream.ToArray()); //AVC Simple Entry
+                var arr = CodecPrivateData.Split([StartCode], StringSplitOptions.RemoveEmptyEntries);
-                    }
+                var vps = HexUtil.HexToBytes(arr.First(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x20));
-                }
+                var sps = HexUtil.HexToBytes(arr.First(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x21));
-                else if (FourCC == "HVC1" || FourCC == "HEV1")
+                var pps = HexUtil.HexToBytes(arr.First(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x22));
-                {
+                // make hvcC
-                    var arr = CodecPrivateData.Split(new[] { StartCode }, StringSplitOptions.RemoveEmptyEntries);
-                    var vps = HexUtil.HexToBytes(arr.Where(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x20).First());
-                    var sps = HexUtil.HexToBytes(arr.Where(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x21).First());
-                    var pps = HexUtil.HexToBytes(arr.Where(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x22).First());
-                    //make hvcC
                 var hvcC = GetHvcC(sps, pps, vps);
                 writer.Write(hvcC);
                 if (IsProtection)
                 {
                     var sinfBox = GenSinf("hvc1");
                     writer.Write(sinfBox);
-                        return Box("encv", stream.ToArray()); //Encrypted Video
+                    return Box("encv", stream.ToArray()); // Encrypted Video
-                    }
-                    else
-                    {
-                        return Box("hvc1", stream.ToArray()); //HEVC Simple Entry
                 }
+                return Box("hvc1", stream.ToArray()); // HEVC Simple Entry
             }
             // 杜比视界也按照hevc处理
-                else if (FourCC == "DVHE" || FourCC == "DVH1")
+            if (FourCC is "DVHE" or "DVH1")
             {
-                    var arr = CodecPrivateData.Split(new[] { StartCode }, StringSplitOptions.RemoveEmptyEntries);
+                var arr = CodecPrivateData.Split([StartCode], StringSplitOptions.RemoveEmptyEntries);
-                    var vps = HexUtil.HexToBytes(arr.Where(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x20).First());
+                var vps = HexUtil.HexToBytes(arr.First(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x20));
-                    var sps = HexUtil.HexToBytes(arr.Where(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x21).First());
+                var sps = HexUtil.HexToBytes(arr.First(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x21));
-                    var pps = HexUtil.HexToBytes(arr.Where(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x22).First());
+                var pps = HexUtil.HexToBytes(arr.First(x => (HexUtil.HexToBytes(x[0..2])[0] >> 1) == 0x22));
-                    //make hvcC
+                // make hvcC
                 var hvcC = GetHvcC(sps, pps, vps, "dvh1");
                 writer.Write(hvcC);
                 if (IsProtection)
                 {
                     var sinfBox = GenSinf("dvh1");
                     writer.Write(sinfBox);
-                        return Box("encv", stream.ToArray()); //Encrypted Video
+                    return Box("encv", stream.ToArray()); // Encrypted Video
                 }
-                    else
+                return Box("dvh1", stream.ToArray()); // HEVC Simple Entry
-                    {
-                        return Box("dvh1", stream.ToArray()); //HEVC Simple Entry
             }
-                }
+
-                else
-                {
             throw new NotSupportedException();
         }
-            }
         else if (StreamType == "text")
         {
             if (FourCC == "TTML")
             {
-                    writer.Write("http://www.w3.org/ns/ttml\0"); //namespace
+                writer.Write("http://www.w3.org/ns/ttml\0"); // namespace
-                    writer.Write("\0"); //schema location
+                writer.Write("\0"); // schema location
-                    writer.Write("\0"); //auxilary mime types(??)
+                writer.Write("\0"); // auxilary mime types(??)
-                    return Box("stpp", stream.ToArray()); //TTML Simple Entry
+                return Box("stpp", stream.ToArray()); // TTML Simple Entry
             }
-                else
-                {
             throw new NotSupportedException();
         }
-            }
         else
         {
             throw new NotSupportedException();
@@ -599,26 +578,26 @@ namespace N_m3u8DL_RE.Parser.Mp4
         using var stream = new MemoryStream();
         using var writer = new BinaryWriter2(stream);
 
-            writer.WriteByte(1); //configuration version
+        writer.WriteByte(1); // configuration version
-            writer.Write(sps[1..4]); //avc profile indication + profile compatibility + avc level indication
+        writer.Write(sps[1..4]); // avc profile indication + profile compatibility + avc level indication
-            writer.WriteByte((byte)(0xfc | (NalUnitLengthField - 1))); //complete representation (1) + reserved (11111) + length size minus one
+        writer.WriteByte((byte)(0xfc | (NalUnitLengthField - 1))); // complete representation (1) + reserved (11111) + length size minus one
-            writer.WriteByte(1); //reserved (0) + number of sps (0000001)
+        writer.WriteByte(1); // reserved (0) + number of sps (0000001)
         writer.WriteUShort(sps.Length);
         writer.Write(sps);
-            writer.WriteByte(1); //number of pps
+        writer.WriteByte(1); // number of pps
         writer.WriteUShort(pps.Length);
         writer.Write(pps);
 
-            return Box("avcC", stream.ToArray()); //AVC Decoder Configuration Record
+        return Box("avcC", stream.ToArray()); // AVC Decoder Configuration Record
     }
 
     private byte[] GetHvcC(byte[] sps, byte[] pps, byte[] vps, string code = "hvc1")
     {
         var oriSps = new List<byte>(sps);
-            //https://www.itu.int/rec/dologin.asp?lang=f&id=T-REC-H.265-201504-S!!PDF-E&type=items
+        // https://www.itu.int/rec/dologin.asp?lang=f&id=T-REC-H.265-201504-S!!PDF-E&type=items
-            //Read generalProfileSpace, generalTierFlag, generalProfileIdc,
+        // Read generalProfileSpace, generalTierFlag, generalProfileIdc,
-            //generalProfileCompatibilityFlags, constraintBytes, generalLevelIdc
+        // generalProfileCompatibilityFlags, constraintBytes, generalLevelIdc
-            //from sps
+        // from sps
         var encList = new List<byte>();
         /**
          * 处理payload, 有00 00 03 0,1,2,3的情况 统一换成00 00 XX 即丢弃03
@@ -635,7 +614,7 @@ namespace N_m3u8DL_RE.Parser.Mp4
             while (_reader.BaseStream.Position < _reader.BaseStream.Length)
             {
                 encList.Add(_reader.ReadByte());
-                    if (encList.Count >= 3 && encList[encList.Count - 3] == 0x00 && encList[encList.Count - 2] == 0x00 && encList[encList.Count - 1] == 0x03)
+                if (encList is [.., 0x00, 0x00, 0x03])
                 {
                     encList.RemoveAt(encList.Count - 1);
                 }
@@ -644,7 +623,7 @@ namespace N_m3u8DL_RE.Parser.Mp4
         sps = encList.ToArray();
 
         using var reader = new BinaryReader2(new MemoryStream(sps));
-            reader.ReadBytes(2); //Skip 2 bytes unit header
+        reader.ReadBytes(2); // Skip 2 bytes unit header
         var firstByte = reader.ReadByte();
         var maxSubLayersMinus1 = (firstByte & 0xe) >> 1;
         var nextByte = reader.ReadByte();
@@ -658,21 +637,21 @@ namespace N_m3u8DL_RE.Parser.Mp4
         /*var skipBit = 0;
         for (int i = 0; i < maxSubLayersMinus1; i++)
         {
-                skipBit += 2; //sub_layer_profile_present_flag sub_layer_level_present_flag
+            skipBit += 2; // sub_layer_profile_present_flag sub_layer_level_present_flag
         }
         if (maxSubLayersMinus1 > 0)
         {
             for (int i = maxSubLayersMinus1; i < 8; i++)
             {
-                    skipBit += 2; //reserved_zero_2bits
+                skipBit += 2; // reserved_zero_2bits
             }
         }
         for (int i = 0; i < maxSubLayersMinus1; i++)
         {
-                skipBit += 2; //sub_layer_profile_present_flag sub_layer_level_present_flag
+            skipBit += 2; // sub_layer_profile_present_flag sub_layer_level_present_flag
         }*/
 
-            //生成编码信息
+        // 生成编码信息
         var codecs = code +
                      $".{HEVC_GENERAL_PROFILE_SPACE_STRINGS[generalProfileSpace]}{generalProfileIdc}" +
                      $".{Convert.ToString(generalProfileCompatibilityFlags, 16)}" +
@@ -687,37 +666,37 @@ namespace N_m3u8DL_RE.Parser.Mp4
         using var stream = new MemoryStream();
         using var writer = new BinaryWriter2(stream);
 
-            //var reserved1 = 0xF;
+        // var reserved1 = 0xF;
 
-            writer.WriteByte(1); //configuration version
+        writer.WriteByte(1); // configuration version
-            writer.WriteByte((byte)((generalProfileSpace << 6) + (generalTierFlag == 1 ? 0x20 : 0) | generalProfileIdc)); //general_profile_space + general_tier_flag + general_profile_idc
+        writer.WriteByte((byte)((generalProfileSpace << 6) + (generalTierFlag == 1 ? 0x20 : 0) | generalProfileIdc)); // general_profile_space + general_tier_flag + general_profile_idc
-            writer.WriteUInt(generalProfileCompatibilityFlags); //general_profile_compatibility_flags
+        writer.WriteUInt(generalProfileCompatibilityFlags); // general_profile_compatibility_flags
-            writer.Write(constraintBytes); //general_constraint_indicator_flags
+        writer.Write(constraintBytes); // general_constraint_indicator_flags
-            writer.WriteByte((byte)generalProfileIdc); //general_level_idc
+        writer.WriteByte((byte)generalProfileIdc); // general_level_idc
-            writer.WriteUShort(0xf000); //reserved + min_spatial_segmentation_idc
+        writer.WriteUShort(0xf000); // reserved + min_spatial_segmentation_idc
-            writer.WriteByte(0xfc); //reserved + parallelismType
+        writer.WriteByte(0xfc); // reserved + parallelismType
-            writer.WriteByte(0 | 0xfc); //reserved + chromaFormat 
+        writer.WriteByte(0 | 0xfc); // reserved + chromaFormat 
-            writer.WriteByte(0 | 0xf8); //reserved + bitDepthLumaMinus8
+        writer.WriteByte(0 | 0xf8); // reserved + bitDepthLumaMinus8
-            writer.WriteByte(0 | 0xf8); //reserved + bitDepthChromaMinus8
+        writer.WriteByte(0 | 0xf8); // reserved + bitDepthChromaMinus8
-            writer.WriteUShort(0); //avgFrameRate
+        writer.WriteUShort(0); // avgFrameRate
-            writer.WriteByte((byte)(0 << 6 | 0 << 3 | 0 << 2 | (NalUnitLengthField - 1))); //constantFrameRate + numTemporalLayers + temporalIdNested + lengthSizeMinusOne
+        writer.WriteByte((byte)(0 << 6 | 0 << 3 | 0 << 2 | (NalUnitLengthField - 1))); // constantFrameRate + numTemporalLayers + temporalIdNested + lengthSizeMinusOne
-            writer.WriteByte(0x03); //numOfArrays (vps sps pps)
+        writer.WriteByte(0x03); // numOfArrays (vps sps pps)
             
         sps = oriSps.ToArray();
-            writer.WriteByte(0x20); //array_completeness + reserved + NAL_unit_type
+        writer.WriteByte(0x20); // array_completeness + reserved + NAL_unit_type
-            writer.WriteUShort(1); //numNalus 
+        writer.WriteUShort(1); // numNalus 
         writer.WriteUShort(vps.Length);
         writer.Write(vps);
         writer.WriteByte(0x21);
-            writer.WriteUShort(1); //numNalus
+        writer.WriteUShort(1); // numNalus
         writer.WriteUShort(sps.Length);
         writer.Write(sps);
         writer.WriteByte(0x22); 
-            writer.WriteUShort(1); //numNalus
+        writer.WriteUShort(1); // numNalus
         writer.WriteUShort(pps.Length);
         writer.Write(pps);
 
-            return Box("hvcC", stream.ToArray()); //HEVC Decoder Configuration Record
+        return Box("hvcC", stream.ToArray()); // HEVC Decoder Configuration Record
     }
 
     private byte[] GetStsd()
@@ -725,7 +704,7 @@ namespace N_m3u8DL_RE.Parser.Mp4
         using var stream = new MemoryStream();
         using var writer = new BinaryWriter2(stream);
 
-            writer.WriteUInt(1); //entry count
+        writer.WriteUInt(1); // entry count
         var sampleEntryData = GetSampleEntryBox();
         writer.Write(sampleEntryData);
 
@@ -739,20 +718,20 @@ namespace N_m3u8DL_RE.Parser.Mp4
 
         writer.WriteULong(Duration);
 
-            return FullBox("mehd", 1, 0, stream.ToArray()); //Movie Extends Header Box
+        return FullBox("mehd", 1, 0, stream.ToArray()); // Movie Extends Header Box
     }
     private byte[] GetTrex()
     {
         using var stream = new MemoryStream();
         using var writer = new BinaryWriter2(stream);
 
-            writer.WriteUInt(TrackId); //track id
+        writer.WriteUInt(TrackId); // track id
-            writer.WriteUInt(1); //default sample description index
+        writer.WriteUInt(1); // default sample description index
-            writer.WriteUInt(0); //default sample duration
+        writer.WriteUInt(0); // default sample duration
-            writer.WriteUInt(0); //default sample size
+        writer.WriteUInt(0); // default sample size
-            writer.WriteUInt(0); //default sample flags
+        writer.WriteUInt(0); // default sample flags
 
-            return FullBox("trex", 0, 0, stream.ToArray()); //Track Extends Box
+        return FullBox("trex", 0, 0, stream.ToArray()); // Track Extends Box
     }
 
     private byte[] GenPsshBoxForPlayReady()
@@ -763,8 +742,8 @@ namespace N_m3u8DL_RE.Parser.Mp4
         var psshData = HexUtil.HexToBytes(ProtectionData);
 
         _writer.Write(sysIdData);  // SystemID 16 bytes
-            _writer.WriteUInt(psshData.Length); //Size of Data 4 bytes
+        _writer.WriteUInt(psshData.Length); // Size of Data 4 bytes
-            _writer.Write(psshData); //Data
+        _writer.Write(psshData); // Data
         var psshBox = FullBox("pssh", 0, 0, _stream.ToArray());
         return psshBox;
     }
@@ -774,12 +753,12 @@ namespace N_m3u8DL_RE.Parser.Mp4
         using var _stream = new MemoryStream();
         using var _writer = new BinaryWriter2(_stream);
         var sysIdData = HexUtil.HexToBytes("edef8ba9-79d6-4ace-a3c8-27dcd51d21ed".Replace("-", ""));
-            //var kid = HexUtil.HexToBytes(ProtecitonKID);
+        // var kid = HexUtil.HexToBytes(ProtectionKID);
 
         _writer.Write(sysIdData);  // SystemID 16 bytes
-            var psshData = HexUtil.HexToBytes($"08011210{ProtecitonKID}1A046E647265220400000000");
+        var psshData = HexUtil.HexToBytes($"08011210{ProtectionKID}1A046E647265220400000000");
-            _writer.WriteUInt(psshData.Length); //Size of Data 4 bytes
+        _writer.WriteUInt(psshData.Length); // Size of Data 4 bytes
-            _writer.Write(psshData); //Data
+        _writer.Write(psshData); // Data
         var psshBox = FullBox("pssh", 0, 0, _stream.ToArray());
         return psshBox;
     }
@@ -789,13 +768,13 @@ namespace N_m3u8DL_RE.Parser.Mp4
         using var stream = new MemoryStream();
         using var writer = new BinaryWriter2(stream);
 
-            //make senc
+        // make senc
-            writer.WriteUInt(1); //sample_count
+        writer.WriteUInt(1); // sample_count
-            writer.Write(new byte[8]); //8 bytes IV
+        writer.Write(new byte[8]); // 8 bytes IV
 
         var sencBox = FullBox("senc", 1, 0, stream.ToArray());
 
-            var moofBox = Box("moof", sencBox); //Movie Extends Box
+        var moofBox = Box("moof", sencBox); // Movie Extends Box
 
         return moofBox;
     }
@@ -805,7 +784,7 @@ namespace N_m3u8DL_RE.Parser.Mp4
         new MP4Parser()
             .Box("moof", MP4Parser.Children)
             .Box("traf", MP4Parser.Children)
-                .FullBox("tfhd", (box) =>
+            .FullBox("tfhd", box =>
             {
                 TrackId = (int)box.Reader.ReadUInt32();
             })
@@ -834,41 +813,41 @@ namespace N_m3u8DL_RE.Parser.Mp4
         var minfPayload = GenMinf();
 
 
-            var sttsPayload = new byte[] { 0, 0, 0, 0 }; //entry count
+        var sttsPayload = new byte[] { 0, 0, 0, 0 }; // entry count
-            var stblPayload = FullBox("stts", 0, 0, sttsPayload); //Decoding Time to Sample Box
+        var stblPayload = FullBox("stts", 0, 0, sttsPayload); // Decoding Time to Sample Box
 
-            var stscPayload = new byte[] { 0, 0, 0, 0 }; //entry count
+        var stscPayload = new byte[] { 0, 0, 0, 0 }; // entry count
-            var stscBox = FullBox("stsc", 0, 0, stscPayload); //Sample To Chunk Box
+        var stscBox = FullBox("stsc", 0, 0, stscPayload); // Sample To Chunk Box
 
-            var stcoPayload = new byte[] { 0, 0, 0, 0 }; //entry count
+        var stcoPayload = new byte[] { 0, 0, 0, 0 }; // entry count
-            var stcoBox = FullBox("stco", 0, 0, stcoPayload); //Chunk Offset Box
+        var stcoBox = FullBox("stco", 0, 0, stcoPayload); // Chunk Offset Box
 
-            var stszPayload = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0 }; //sample size, sample count
+        var stszPayload = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0 }; // sample size, sample count
-            var stszBox = FullBox("stsz", 0, 0, stszPayload); //Sample Size Box
+        var stszBox = FullBox("stsz", 0, 0, stszPayload); // Sample Size Box
 
         var stsdPayload = GetStsd();
-            var stsdBox = FullBox("stsd", 0, 0, stsdPayload); //Sample Description Box
+        var stsdBox = FullBox("stsd", 0, 0, stsdPayload); // Sample Description Box
 
         stblPayload = stblPayload.Concat(stscBox).Concat(stcoBox).Concat(stszBox).Concat(stsdBox).ToArray();
 
 
-            var stblBox = Box("stbl", stblPayload); //Sample Table Box
+        var stblBox = Box("stbl", stblPayload); // Sample Table Box
         minfPayload = minfPayload.Concat(stblBox).ToArray();
 
-            var minfBox = Box("minf", minfPayload); //Media Information Box
+        var minfBox = Box("minf", minfPayload); // Media Information Box
         mdiaPayload = mdiaPayload.Concat(minfBox).ToArray();
 
-            var mdiaBox = Box("mdia", mdiaPayload); //Media Box
+        var mdiaBox = Box("mdia", mdiaPayload); // Media Box
         trakPayload = trakPayload.Concat(mdiaBox).ToArray();
 
-            var trakBox = Box("trak", trakPayload); //Track Box
+        var trakBox = Box("trak", trakPayload); // Track Box
         moovPayload = moovPayload.Concat(trakBox).ToArray();
 
         var mvexPayload = GetMehd();
         var trexBox = GetTrex();
         mvexPayload = mvexPayload.Concat(trexBox).ToArray();
 
-            var mvexBox = Box("mvex", mvexPayload); //Movie Extends Box
+        var mvexBox = Box("mvex", mvexPayload); // Movie Extends Box
         moovPayload = moovPayload.Concat(mvexBox).ToArray();
 
         if (IsProtection)
@@ -878,14 +857,13 @@ namespace N_m3u8DL_RE.Parser.Mp4
             moovPayload = moovPayload.Concat(psshBox1).Concat(psshBox2).ToArray();
         }
 
-            var moovBox = Box("moov", moovPayload); //Movie Box
+        var moovBox = Box("moov", moovPayload); // Movie Box
 
         stream.Write(moovBox);
 
-            //var moofBox = GenMoof(); //Movie Extends Box
+        // var moofBox = GenMoof(); // Movie Extends Box
-            //stream.Write(moofBox);
+        // stream.Write(moofBox);
 
         return stream.ToArray();
     }
-    }
 }

src/N_m3u8DL-RE.Parser/N_m3u8DL-RE.Parser.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>library</OutputType>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <RootNamespace>N_m3u8DL_RE.Parser</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <LangVersion>preview</LangVersion>

src/N_m3u8DL-RE.Parser/Processor/ContentProcessor.cs

@@ -1,16 +1,10 @@
 using N_m3u8DL_RE.Common.Enum;
 using N_m3u8DL_RE.Parser.Config;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Parser.Processor
+namespace N_m3u8DL_RE.Parser.Processor;
+
+public abstract class ContentProcessor
 {
-    public abstract class ContentProcessor
-    {
     public abstract bool CanProcess(ExtractorType extractorType, string rawText, ParserConfig parserConfig);
     public abstract string Process(string rawText, ParserConfig parserConfig);
-    }
 }

src/N_m3u8DL-RE.Parser/Processor/DASH/DefaultDASHContentProcessor.cs

@@ -1,28 +1,19 @@
 using N_m3u8DL_RE.Common.Enum;
 using N_m3u8DL_RE.Common.Log;
 using N_m3u8DL_RE.Parser.Config;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Parser.Processor.DASH
+namespace N_m3u8DL_RE.Parser.Processor.DASH;
+
+/// <summary>
+/// XG视频处理
+/// </summary>
+public class DefaultDASHContentProcessor : ContentProcessor
 {
-    /// <summary>
-    /// 西瓜视频处理
-    /// </summary>
-    public class DefaultDASHContentProcessor : ContentProcessor
-    {
     public override bool CanProcess(ExtractorType extractorType, string mpdContent, ParserConfig parserConfig)
     {
         if (extractorType != ExtractorType.MPEG_DASH) return false;
 
-            if (mpdContent.Contains("<mas:") && !mpdContent.Contains("xmlns:mas"))
+        return mpdContent.Contains("<mas:") && !mpdContent.Contains("xmlns:mas");
-            {
-                return true;
-            }
-            return false;
     }
 
     public override string Process(string mpdContent, ParserConfig parserConfig)
@@ -32,5 +23,4 @@ namespace N_m3u8DL_RE.Parser.Processor.DASH
 
         return mpdContent;
     }
-    }
 }

src/N_m3u8DL-RE.Parser/Processor/DefaultUrlProcessor.cs

@@ -1,24 +1,18 @@
 using N_m3u8DL_RE.Common.Enum;
 using N_m3u8DL_RE.Common.Log;
 using N_m3u8DL_RE.Parser.Config;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Text.RegularExpressions;
-using System.Threading.Tasks;
 using System.Web;
 
-namespace N_m3u8DL_RE.Parser.Processor
+namespace N_m3u8DL_RE.Parser.Processor;
+
+public class DefaultUrlProcessor : UrlProcessor
 {
-    public class DefaultUrlProcessor : UrlProcessor
-    {
     public override bool CanProcess(ExtractorType extractorType, string oriUrl, ParserConfig paserConfig) => paserConfig.AppendUrlParams;
 
     public override string Process(string oriUrl, ParserConfig paserConfig)
     {
-            if (oriUrl.StartsWith("http")) 
+        if (!oriUrl.StartsWith("http")) return oriUrl;
-            {
+        
         var uriFromConfig = new Uri(paserConfig.Url);
         var uriFromConfigQuery = HttpUtility.ParseQueryString(uriFromConfig.Query);
 
@@ -32,15 +26,12 @@ namespace N_m3u8DL_RE.Parser.Processor
                 newQuery.Add(item, uriFromConfigQuery.Get(item));
         }
 
-                if (!string.IsNullOrEmpty(newQuery.ToString()))
+        if (string.IsNullOrEmpty(newQuery.ToString())) return oriUrl;
-                {
+        
         Logger.Debug("Before: " + oriUrl);
-                    oriUrl = (oldUri.GetLeftPart(UriPartial.Path) + "?" + newQuery.ToString()).TrimEnd('?');
+        oriUrl = (oldUri.GetLeftPart(UriPartial.Path) + "?" + newQuery).TrimEnd('?');
         Logger.Debug("After: " + oriUrl);
-                }
-            }
 
         return oriUrl;
     }
-    }
 }

src/N_m3u8DL-RE.Parser/Processor/HLS/DefaultHLSContentProcessor.cs

@@ -1,70 +1,59 @@
 using N_m3u8DL_RE.Common.Enum;
 using N_m3u8DL_RE.Parser.Config;
 using N_m3u8DL_RE.Parser.Constants;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 using System.Text.RegularExpressions;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Parser.Processor.HLS
+namespace N_m3u8DL_RE.Parser.Processor.HLS;
+
+public partial class DefaultHLSContentProcessor : ContentProcessor
 {
-    public partial class DefaultHLSContentProcessor : ContentProcessor
-    {
     [GeneratedRegex("#EXT-X-DISCONTINUITY\\s+#EXT-X-MAP:URI=\\\"(.*?)\\\",BYTERANGE=\\\"(.*?)\\\"")]
     private static partial Regex YkDVRegex();
     [GeneratedRegex("#EXT-X-MAP:URI=\\\".*?BUMPER/[\\s\\S]+?#EXT-X-DISCONTINUITY")]
     private static partial Regex DNSPRegex();
-        [GeneratedRegex("#EXTINF:.*?,\\s+.*BUMPER.*\\s+?#EXT-X-DISCONTINUITY")]
+    [GeneratedRegex(@"#EXTINF:.*?,\s+.*BUMPER.*\s+?#EXT-X-DISCONTINUITY")]
     private static partial Regex DNSPSubRegex();
     [GeneratedRegex("(#EXTINF.*)(\\s+)(#EXT-X-KEY.*)")]
     private static partial Regex OrderFixRegex();
-        [GeneratedRegex("#EXT-X-MAP.*\\.apple\\.com/")]
+    [GeneratedRegex(@"#EXT-X-MAP.*\.apple\.com/")]
     private static partial Regex ATVRegex();
-        [GeneratedRegex("(#EXT-X-KEY:[\\s\\S]*?)(#EXT-X-DISCONTINUITY|#EXT-X-ENDLIST)")]
+    [GeneratedRegex(@"(#EXT-X-KEY:[\s\S]*?)(#EXT-X-DISCONTINUITY|#EXT-X-ENDLIST)")]
     private static partial Regex ATVRegex2();
 
     public override bool CanProcess(ExtractorType extractorType, string rawText, ParserConfig parserConfig) => extractorType == ExtractorType.HLS;
 
     public override string Process(string m3u8Content, ParserConfig parserConfig)
     {
-            //处理content以\r作为换行符的情况
+        // 处理content以\r作为换行符的情况
-            if (m3u8Content.Contains("\r") && !m3u8Content.Contains("\n"))
+        if (m3u8Content.Contains('\r') && !m3u8Content.Contains('\n'))
         {
             m3u8Content = m3u8Content.Replace("\r", Environment.NewLine);
         }
 
         var m3u8Url = parserConfig.Url;
-            //央视频回放
+        // YSP回放
         if (m3u8Url.Contains("tlivecloud-playback-cdn.ysp.cctv.cn") && m3u8Url.Contains("endtime="))
         {
             m3u8Content += Environment.NewLine + HLSTags.ext_x_endlist;
         }
 
-            //IMOOC
+        // IMOOC
         if (m3u8Url.Contains("imooc.com/"))
         {
-                //M3u8Content = DecodeImooc.DecodeM3u8(M3u8Content);
+            // M3u8Content = DecodeImooc.DecodeM3u8(M3u8Content);
         }
 
-            //iqy
+        // 针对YK #EXT-X-VERSION:7杜比视界片源修正
-            if (m3u8Content.StartsWith("{\"payload\""))
-            {
-                //
-            }
-
-            //针对优酷#EXT-X-VERSION:7杜比视界片源修正
         if (m3u8Content.Contains("#EXT-X-DISCONTINUITY") && m3u8Content.Contains("#EXT-X-MAP") && m3u8Content.Contains("ott.cibntv.net") && m3u8Content.Contains("ccode="))
         {
-                Regex ykmap = YkDVRegex();
+            var ykmap = YkDVRegex();
             foreach (Match m in ykmap.Matches(m3u8Content))
             {
                 m3u8Content = m3u8Content.Replace(m.Value, $"#EXTINF:0.000000,\n#EXT-X-BYTERANGE:{m.Groups[2].Value}\n{m.Groups[1].Value}");
             }
         }
 
-            //针对Disney+修正
+        // 针对Disney+修正
         if (m3u8Content.Contains("#EXT-X-DISCONTINUITY") && m3u8Content.Contains("#EXT-X-MAP") && m3u8Url.Contains("media.dssott.com/"))
         {
             Regex ykmap = DNSPRegex();
@@ -74,7 +63,7 @@ namespace N_m3u8DL_RE.Parser.Processor.HLS
             }
         }
 
-            //针对Disney+字幕修正
+        // 针对Disney+字幕修正
         if (m3u8Content.Contains("#EXT-X-DISCONTINUITY") && m3u8Content.Contains("seg_00000.vtt") && m3u8Url.Contains("media.dssott.com/"))
         {
             Regex ykmap = DNSPSubRegex();
@@ -84,10 +73,10 @@ namespace N_m3u8DL_RE.Parser.Processor.HLS
             }
         }
 
-            //针对AppleTv修正
+        // 针对AppleTv修正
         if (m3u8Content.Contains("#EXT-X-DISCONTINUITY") && m3u8Content.Contains("#EXT-X-MAP") && (m3u8Url.Contains(".apple.com/") || ATVRegex().IsMatch(m3u8Content)))
         {
-                //只取加密部分即可
+            // 只取加密部分即可
             Regex ykmap = ATVRegex2();
             if (ykmap.IsMatch(m3u8Content))
             {
@@ -95,7 +84,7 @@ namespace N_m3u8DL_RE.Parser.Processor.HLS
             }
         }
 
-            //修复#EXT-X-KEY与#EXTINF出现次序异常问题
+        // 修复#EXT-X-KEY与#EXTINF出现次序异常问题
         var regex = OrderFixRegex();
         if (regex.IsMatch(m3u8Content))
         {
@@ -104,5 +93,4 @@ namespace N_m3u8DL_RE.Parser.Processor.HLS
 
         return m3u8Content;
     }
-    }
 }

src/N_m3u8DL-RE.Parser/Processor/HLS/DefaultHLSKeyProcessor.cs

@@ -6,16 +6,11 @@ using N_m3u8DL_RE.Common.Util;
 using N_m3u8DL_RE.Parser.Config;
 using N_m3u8DL_RE.Parser.Util;
 using Spectre.Console;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Parser.Processor.HLS
+namespace N_m3u8DL_RE.Parser.Processor.HLS;
+
+public class DefaultHLSKeyProcessor : KeyProcessor
 {
-    public class DefaultHLSKeyProcessor : KeyProcessor
-    {
     public override bool CanProcess(ExtractorType extractorType, string m3u8Url, string keyLine, string m3u8Content, ParserConfig paserConfig) => extractorType == ExtractorType.HLS;
 
 
@@ -29,21 +24,21 @@ namespace N_m3u8DL_RE.Parser.Processor.HLS
 
         var encryptInfo = new EncryptInfo(method);
 
-            //IV
+        // IV
         if (!string.IsNullOrEmpty(iv))
         {
             encryptInfo.IV = HexUtil.HexToBytes(iv);
         }
-            //自定义IV
+        // 自定义IV
-            if (parserConfig.CustomeIV != null && parserConfig.CustomeIV.Length > 0) 
+        if (parserConfig.CustomeIV is { Length: > 0 }) 
         {
             encryptInfo.IV = parserConfig.CustomeIV;
         }
 
-            //KEY
+        // KEY
         try
         {
-                if (parserConfig.CustomeKey != null && parserConfig.CustomeKey.Length > 0)
+            if (parserConfig.CustomeKey is { Length: > 0 })
             {
                 encryptInfo.Key = parserConfig.CustomeKey;
             }
@@ -78,7 +73,7 @@ namespace N_m3u8DL_RE.Parser.Processor.HLS
                     Logger.WarnMarkUp($"[grey]{_ex.Message.EscapeMarkup()} retryCount: {retryCount}[/]");
                     Thread.Sleep(1000);
                     if (retryCount-- > 0) goto getHttpKey;
-                        else throw;
+                    throw;
                 }
             }
         }
@@ -88,12 +83,11 @@ namespace N_m3u8DL_RE.Parser.Processor.HLS
             encryptInfo.Method = EncryptMethod.UNKNOWN;
         }
 
-            //处理自定义加密方式
+        if (parserConfig.CustomMethod == null) return encryptInfo;
-            if (parserConfig.CustomMethod != null)
+        
-            {
+        // 处理自定义加密方式
         encryptInfo.Method = parserConfig.CustomMethod.Value;
         Logger.Warn("METHOD changed from {} to {}", method, encryptInfo.Method);
-            }
 
         return encryptInfo;
     }
@@ -113,5 +107,4 @@ namespace N_m3u8DL_RE.Parser.Processor.HLS
 
         return url;
     }
-    }
 }

src/N_m3u8DL-RE.Parser/Processor/KeyProcessor.cs

@@ -1,17 +1,11 @@
 using N_m3u8DL_RE.Common.Entity;
 using N_m3u8DL_RE.Common.Enum;
 using N_m3u8DL_RE.Parser.Config;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Parser.Processor
+namespace N_m3u8DL_RE.Parser.Processor;
+
+public abstract class KeyProcessor
 {
-    public abstract class KeyProcessor
-    {
     public abstract bool CanProcess(ExtractorType extractorType, string keyLine, string m3u8Url, string m3u8Content, ParserConfig parserConfig);
     public abstract EncryptInfo Process(string keyLine, string m3u8Url, string m3u8Content, ParserConfig parserConfig);
-    }
 }

src/N_m3u8DL-RE.Parser/Processor/UrlProcessor.cs

@@ -1,16 +1,10 @@
 using N_m3u8DL_RE.Common.Enum;
 using N_m3u8DL_RE.Parser.Config;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Parser.Processor
+namespace N_m3u8DL_RE.Parser.Processor;
+
+public abstract class UrlProcessor
 {
-    public abstract class UrlProcessor
-    {
     public abstract bool CanProcess(ExtractorType extractorType, string oriUrl, ParserConfig parserConfig);
     public abstract string Process(string oriUrl, ParserConfig parserConfig);
-    }
 }

src/N_m3u8DL-RE.Parser/StreamExtractor.cs

@@ -1,4 +1,5 @@
-using N_m3u8DL_RE.Parser.Config;
+using System.Diagnostics.CodeAnalysis;
+using N_m3u8DL_RE.Parser.Config;
 using N_m3u8DL_RE.Common.Entity;
 using N_m3u8DL_RE.Common.Log;
 using N_m3u8DL_RE.Common.Resource;
@@ -6,24 +7,18 @@ using N_m3u8DL_RE.Parser.Constants;
 using N_m3u8DL_RE.Parser.Extractor;
 using N_m3u8DL_RE.Common.Util;
 using N_m3u8DL_RE.Common.Enum;
-using Spectre.Console;
 
-namespace N_m3u8DL_RE.Parser
+namespace N_m3u8DL_RE.Parser;
+
+public class StreamExtractor
 {
-    public class StreamExtractor
+    public ExtractorType ExtractorType => extractor.ExtractorType;
-    {
-        public ExtractorType ExtractorType { get => extractor.ExtractorType; }
     private IExtractor extractor;
-        private ParserConfig parserConfig = new ParserConfig();
+    private ParserConfig parserConfig = new();
     private string rawText;
-        private static SemaphoreSlim semaphore = new SemaphoreSlim(1, 1);
+    private static SemaphoreSlim semaphore = new(1, 1);
 
-        public Dictionary<string, string> RawFiles { get; set; } = new(); //存储（文件名,文件内容）
+    public Dictionary<string, string> RawFiles { get; set; } = new(); // 存储（文件名,文件内容）
-
-        public StreamExtractor()
-        {
-
-        }
 
     public StreamExtractor(ParserConfig parserConfig)
     {
@@ -55,7 +50,8 @@ namespace N_m3u8DL_RE.Parser
         LoadSourceFromText(this.rawText);
     }
 
-        public void LoadSourceFromText(string rawText)
+    [MemberNotNull(nameof(this.rawText), nameof(this.extractor))]
+    private void LoadSourceFromText(string rawText)
     {
         var rawType = "txt";
         rawText = rawText.Trim();
@@ -69,14 +65,14 @@ namespace N_m3u8DL_RE.Parser
         else if (rawText.Contains("</MPD>") && rawText.Contains("<MPD"))
         {
             Logger.InfoMarkUp(ResString.matchDASH);
-                //extractor = new DASHExtractor(parserConfig);
+            // extractor = new DASHExtractor(parserConfig);
             extractor = new DASHExtractor2(parserConfig);
             rawType = "mpd";
         }
         else if (rawText.Contains("</SmoothStreamingMedia>") && rawText.Contains("<SmoothStreamingMedia"))
         {
             Logger.InfoMarkUp(ResString.matchMSS);
-                //extractor = new DASHExtractor(parserConfig);
+            // extractor = new DASHExtractor(parserConfig);
             extractor = new MSSExtractor(parserConfig);
             rawType = "ism";
         }
@@ -145,5 +141,4 @@ namespace N_m3u8DL_RE.Parser
             semaphore.Release();
         }
     }
-    }
 }

src/N_m3u8DL-RE.Parser/Util/ParserUtil.cs

@@ -1,16 +1,11 @@
 using N_m3u8DL_RE.Parser.Constants;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 using System.Text.RegularExpressions;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Parser.Util
+namespace N_m3u8DL_RE.Parser.Util;
+
+public static partial class ParserUtil
 {
-    public partial class ParserUtil
+    [GeneratedRegex(@"\$Number%([^$]+)d\$")]
-    {
-        [GeneratedRegex("\\$Number%([^$]+)d\\$")]
     private static partial Regex VarsNumberRegex();
 
     /// <summary>
@@ -28,18 +23,17 @@ namespace N_m3u8DL_RE.Parser.Util
 
         var index = -1;
         var result = string.Empty;
-            if ((index = line.IndexOf(key + "=\"")) > -1)
+        if ((index = line.IndexOf(key + "=\"", StringComparison.Ordinal)) > -1)
         {
             var startIndex = index + (key + "=\"").Length;
             var endIndex = startIndex + line[startIndex..].IndexOf('\"');
             result = line[startIndex..endIndex];
         }
-            else if ((index = line.IndexOf(key + "=")) > -1)
+        else if ((index = line.IndexOf(key + "=", StringComparison.Ordinal)) > -1)
         {
             var startIndex = index + (key + "=").Length;
             var endIndex = startIndex + line[startIndex..].IndexOf(',');
-                if (endIndex >= startIndex) result = line[startIndex..endIndex];
+            result = endIndex >= startIndex ? line[startIndex..endIndex] : line[startIndex..];
-                else result = line[startIndex..];
         }
 
         return result;
@@ -54,18 +48,13 @@ namespace N_m3u8DL_RE.Parser.Util
     public static (long, long?) GetRange(string input)
     {
         var t = input.Split('@');
-            if (t.Length > 0)
+        return t.Length switch
         {
-                if (t.Length == 1)
+            <= 0 => (0, null),
-                {
+            1 => (Convert.ToInt64(t[0]), null),
-                    return (Convert.ToInt64(t[0]), null);
+            2 => (Convert.ToInt64(t[0]), Convert.ToInt64(t[1])),
-                }
+            _ => (0, null)
-                if (t.Length == 2)
+        };
-                {
-                    return (Convert.ToInt64(t[0]), Convert.ToInt64(t[1]));
-                }
-            }
-            return (0, null);
     }
 
     /// <summary>
@@ -92,13 +81,13 @@ namespace N_m3u8DL_RE.Parser.Util
             if (text.Contains(item.Key))
                 text = text.Replace(item.Key, item.Value!.ToString());
 
-            //处理特殊形式数字 如 $Number%05d$
+        // 处理特殊形式数字 如 $Number%05d$
         var regex = VarsNumberRegex();
-            if (regex.IsMatch(text) && keyValuePairs.ContainsKey(DASHTags.TemplateNumber)) 
+        if (regex.IsMatch(text) && keyValuePairs.TryGetValue(DASHTags.TemplateNumber, out var keyValuePair)) 
         {
             foreach (Match m in regex.Matches(text))
             {
-                    text = text.Replace(m.Value, keyValuePairs[DASHTags.TemplateNumber]?.ToString()?.PadLeft(Convert.ToInt32(m.Groups[1].Value), '0'));
+                text = text.Replace(m.Value, keyValuePair?.ToString()?.PadLeft(Convert.ToInt32(m.Groups[1].Value), '0'));
             }
         }
 
@@ -116,11 +105,10 @@ namespace N_m3u8DL_RE.Parser.Util
         if (string.IsNullOrEmpty(baseurl))
             return url;
 
-            Uri uri1 = new Uri(baseurl);  //这里直接传完整的URL即可
+        var uri1 = new Uri(baseurl);  // 这里直接传完整的URL即可
-            Uri uri2 = new Uri(uri1, url);
+        var uri2 = new Uri(uri1, url);
         url = uri2.ToString();
 
         return url;
     }
-    }
 }

src/N_m3u8DL-RE/Column/DownloadSpeedColumn.cs

@@ -1,18 +1,13 @@
-using N_m3u8DL_RE.Common.Log;
+using N_m3u8DL_RE.Entity;
-using N_m3u8DL_RE.Entity;
 using Spectre.Console;
 using Spectre.Console.Rendering;
-using System;
 using System.Collections.Concurrent;
-using System.Collections.Generic;
+using N_m3u8DL_RE.Common.Util;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Column
+namespace N_m3u8DL_RE.Column;
+
+internal sealed class DownloadSpeedColumn : ProgressColumn
 {
-    internal sealed class DownloadSpeedColumn : ProgressColumn
-    {
     private long _stopSpeed = 0;
     private ConcurrentDictionary<int, string> DateTimeStringDic = new();
     protected override bool NoWrap => true;
@@ -31,36 +26,23 @@ namespace N_m3u8DL_RE.Column
         var speedContainer = SpeedContainerDic[taskId];
         var now = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
         var flag = task.IsFinished || !task.IsStarted;
-            //单文件下载汇报进度
+        // 单文件下载汇报进度
-            if (!flag && speedContainer.SingleSegment && speedContainer.ResponseLength != null)
+        if (!flag && speedContainer is { SingleSegment: true, ResponseLength: not null })
         {
             task.MaxValue = (double)speedContainer.ResponseLength;
             task.Value = speedContainer.RDownloaded;
         }
-            //一秒汇报一次即可
+        // 一秒汇报一次即可
         if (DateTimeStringDic.TryGetValue(taskId, out var oldTime) && oldTime != now && !flag)
         {
             speedContainer.NowSpeed = speedContainer.Downloaded;
-                //速度为0，计数增加
+            // 速度为0，计数增加
             if (speedContainer.Downloaded <= _stopSpeed) { speedContainer.AddLowSpeedCount(); }
             else speedContainer.ResetLowSpeedCount();
             speedContainer.Reset();
         }
         DateTimeStringDic[taskId] = now;
         var style = flag ? Style.Plain : MyStyle;
-            return flag ? new Text("-", style).Centered() : new Text(FormatFileSize(speedContainer.NowSpeed) + (speedContainer.LowSpeedCount > 0 ? $"({speedContainer.LowSpeedCount})" : ""), style).Centered();
+        return flag ? new Text("-", style).Centered() : new Text(GlobalUtil.FormatFileSize(speedContainer.NowSpeed) + "ps" + (speedContainer.LowSpeedCount > 0 ? $"({speedContainer.LowSpeedCount})" : ""), style).Centered();
-        }
-
-        private static string FormatFileSize(double fileSize)
-        {
-            return fileSize switch
-            {
-                < 0 => throw new ArgumentOutOfRangeException(nameof(fileSize)),
-                >= 1024 * 1024 * 1024 => string.Format("{0:########0.00}GBps", (double)fileSize / (1024 * 1024 * 1024)),
-                >= 1024 * 1024 => string.Format("{0:####0.00}MBps", (double)fileSize / (1024 * 1024)),
-                >= 1024 => string.Format("{0:####0.00}KBps", (double)fileSize / 1024),
-                _ => string.Format("{0:####0.00}Bps", fileSize)
-            };
-        }
     }
 }

src/N_m3u8DL-RE/Column/DownloadStatusColumn.cs

@@ -2,17 +2,12 @@
 using N_m3u8DL_RE.Entity;
 using Spectre.Console;
 using Spectre.Console.Rendering;
-using System;
 using System.Collections.Concurrent;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Column
+namespace N_m3u8DL_RE.Column;
+
+internal class DownloadStatusColumn : ProgressColumn
 {
-    internal class DownloadStatusColumn : ProgressColumn
-    {
     private ConcurrentDictionary<int, SpeedContainer> SpeedContainerDic { get; set; }
     private ConcurrentDictionary<int, string> DateTimeStringDic = new();
     private ConcurrentDictionary<int, string> SizeDic = new();
@@ -32,7 +27,7 @@ namespace N_m3u8DL_RE.Column
         var speedContainer = SpeedContainerDic[task.Id];
         var size = speedContainer.RDownloaded;
 
-            //一秒汇报一次即可
+        // 一秒汇报一次即可
         if (DateTimeStringDic.TryGetValue(task.Id, out var oldTime) && oldTime != now)
         {
             var totalSize = speedContainer.SingleSegment ? (speedContainer.ResponseLength ?? 0) : (long)(size / (task.Value / task.MaxValue));
@@ -45,5 +40,4 @@ namespace N_m3u8DL_RE.Column
 
         return new Text(sizeStr ?? "-", MyStyle).RightJustified();
     }
-    }
 }

src/N_m3u8DL-RE/Column/MyPercentageColumn.cs

@@ -1,15 +1,10 @@
 using Spectre.Console.Rendering;
 using Spectre.Console;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Column
+namespace N_m3u8DL_RE.Column;
+
+internal class MyPercentageColumn : ProgressColumn
 {
-    internal class MyPercentageColumn : ProgressColumn
-    {
     /// <summary>
     /// Gets or sets the style for a non-complete task.
     /// </summary>
@@ -27,5 +22,4 @@ namespace N_m3u8DL_RE.Column
         var style = percentage == 100 ? CompletedStyle : Style ?? Style.Plain;
         return new Text($"{task.Value}/{task.MaxValue} {percentage:F2}%", style).RightJustified();
     }
-    }
 }

src/N_m3u8DL-RE/Column/RecordingDurationColumn.cs

@@ -1,17 +1,12 @@
 using N_m3u8DL_RE.Common.Util;
 using Spectre.Console;
 using Spectre.Console.Rendering;
-using System;
 using System.Collections.Concurrent;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Column
+namespace N_m3u8DL_RE.Column;
+
+internal class RecordingDurationColumn : ProgressColumn
 {
-    internal class RecordingDurationColumn : ProgressColumn
-    {
     protected override bool NoWrap => true;
     private ConcurrentDictionary<int, int> _recodingDurDic;
     private ConcurrentDictionary<int, int>? _refreshedDurDic;
@@ -30,10 +25,6 @@ namespace N_m3u8DL_RE.Column
     {
         if (_refreshedDurDic == null)
             return new Text($"{GlobalUtil.FormatTime(_recodingDurDic[task.Id])}", MyStyle).LeftJustified();
-            else
-            {                
         return new Text($"{GlobalUtil.FormatTime(_recodingDurDic[task.Id])}/{GlobalUtil.FormatTime(_refreshedDurDic[task.Id])}", GreyStyle);
     }
-        }
-    }
 }

src/N_m3u8DL-RE/Column/RecordingSizeColumn.cs

@@ -1,20 +1,14 @@
 using N_m3u8DL_RE.Common.Util;
-using N_m3u8DL_RE.Entity;
 using Spectre.Console;
 using Spectre.Console.Rendering;
-using System;
 using System.Collections.Concurrent;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Column
+namespace N_m3u8DL_RE.Column;
+
+internal class RecordingSizeColumn : ProgressColumn
 {
-    internal class RecordingSizeColumn : ProgressColumn
-    {
     protected override bool NoWrap => true;
-        private ConcurrentDictionary<int, double> RecodingSizeDic = new(); //临时的大小 每秒刷新用
+    private ConcurrentDictionary<int, double> RecodingSizeDic = new(); // 临时的大小 每秒刷新用
     private ConcurrentDictionary<int, double> _recodingSizeDic;
     private ConcurrentDictionary<int, string> DateTimeStringDic = new();
     public Style MyStyle { get; set; } = new Style(foreground: Color.DarkCyan);
@@ -26,7 +20,7 @@ namespace N_m3u8DL_RE.Column
     {
         var now = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
         var taskId = task.Id;
-            //一秒汇报一次即可
+        // 一秒汇报一次即可
         if (DateTimeStringDic.TryGetValue(taskId, out var oldTime) && oldTime != now)
         {
             RecodingSizeDic[task.Id] = _recodingSizeDic[task.Id];
@@ -35,5 +29,4 @@ namespace N_m3u8DL_RE.Column
         var flag = RecodingSizeDic.TryGetValue(taskId, out var size);
         return new Text(GlobalUtil.FormatFileSize(flag ? size : 0), MyStyle).LeftJustified();
     }
-    }
 }

src/N_m3u8DL-RE/Column/RecordingStatusColumn.cs

@@ -1,15 +1,10 @@
 using Spectre.Console;
 using Spectre.Console.Rendering;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Column
+namespace N_m3u8DL_RE.Column;
+
+internal class RecordingStatusColumn : ProgressColumn
 {
-    internal class RecordingStatusColumn : ProgressColumn
-    {
     protected override bool NoWrap => true;
     public Style MyStyle { get; set; } = new Style(foreground: Color.Default);
     public Style FinishedStyle { get; set; } = new Style(foreground: Color.Yellow);
@@ -19,5 +14,4 @@ namespace N_m3u8DL_RE.Column
             return new Text($"{task.Value}/{task.MaxValue} Waiting  ", FinishedStyle).LeftJustified();
         return new Text($"{task.Value}/{task.MaxValue} Recording", MyStyle).LeftJustified();
     }
-    }
 }

src/N_m3u8DL-RE/CommandLine/CommandInvoker.cs

@@ -5,7 +5,6 @@ using N_m3u8DL_RE.Common.Util;
 using N_m3u8DL_RE.Entity;
 using N_m3u8DL_RE.Enum;
 using N_m3u8DL_RE.Util;
-using NiL.JS.Expressions;
 using System.CommandLine;
 using System.CommandLine.Binding;
 using System.CommandLine.Builder;
@@ -14,115 +13,120 @@ using System.Globalization;
 using System.Net;
 using System.Text.RegularExpressions;
 
-namespace N_m3u8DL_RE.CommandLine
+namespace N_m3u8DL_RE.CommandLine;
+
+internal static partial class CommandInvoker
 {
-    internal partial class CommandInvoker
+    public const string VERSION_INFO = "N_m3u8DL-RE (Beta version) 20241216";
-    {
-        public const string VERSION_INFO = "N_m3u8DL-RE (Beta version) 20240630";
 
     [GeneratedRegex("((best|worst)\\d*|all)")]
     private static partial Regex ForStrRegex();
-        [GeneratedRegex("(\\d*)-(\\d*)")]
+    [GeneratedRegex(@"(\d*)-(\d*)")]
     private static partial Regex RangeRegex();
+    [GeneratedRegex(@"([\d\\.]+)(M|K)")]
+    private static partial Regex SpeedStrRegex();
 
-        private readonly static Argument<string> Input = new(name: "input", description: ResString.cmd_Input);
+    private static readonly Argument<string> Input = new(name: "input", description: ResString.cmd_Input);
-        private readonly static Option<string?> TmpDir = new(new string[] { "--tmp-dir" }, description: ResString.cmd_tmpDir);
+    private static readonly Option<string?> TmpDir = new(["--tmp-dir"], description: ResString.cmd_tmpDir);
-        private readonly static Option<string?> SaveDir = new(new string[] { "--save-dir" }, description: ResString.cmd_saveDir);
+    private static readonly Option<string?> SaveDir = new(["--save-dir"], description: ResString.cmd_saveDir);
-        private readonly static Option<string?> SaveName = new(new string[] { "--save-name" }, description: ResString.cmd_saveName, parseArgument: ParseSaveName);
+    private static readonly Option<string?> SaveName = new(["--save-name"], description: ResString.cmd_saveName, parseArgument: ParseSaveName);
-        private readonly static Option<string?> SavePattern = new(new string[] { "--save-pattern" }, description: ResString.cmd_savePattern, getDefaultValue: () => "<SaveName>_<Id>_<Codecs>_<Language>_<Ext>");
+    private static readonly Option<string?> SavePattern = new(["--save-pattern"], description: ResString.cmd_savePattern, getDefaultValue: () => "<SaveName>_<Id>_<Codecs>_<Language>_<Ext>");
-        private readonly static Option<string?> UILanguage = new Option<string?>(new string[] { "--ui-language" }, description: ResString.cmd_uiLanguage).FromAmong("en-US", "zh-CN", "zh-TW");
+    private static readonly Option<string?> UILanguage = new Option<string?>(["--ui-language"], description: ResString.cmd_uiLanguage).FromAmong("en-US", "zh-CN", "zh-TW");
-        private readonly static Option<string?> UrlProcessorArgs = new(new string[] { "--urlprocessor-args" }, description: ResString.cmd_urlProcessorArgs);
+    private static readonly Option<string?> UrlProcessorArgs = new(["--urlprocessor-args"], description: ResString.cmd_urlProcessorArgs);
-        private readonly static Option<string[]?> Keys = new(new string[] { "--key" }, description: ResString.cmd_keys) { Arity = ArgumentArity.OneOrMore, AllowMultipleArgumentsPerToken = false };
+    private static readonly Option<string[]?> Keys = new(["--key"], description: ResString.cmd_keys) { Arity = ArgumentArity.OneOrMore, AllowMultipleArgumentsPerToken = false };
-        private readonly static Option<string> KeyTextFile = new(new string[] { "--key-text-file" }, description: ResString.cmd_keyText);
+    private static readonly Option<string> KeyTextFile = new(["--key-text-file"], description: ResString.cmd_keyText);
-        private readonly static Option<Dictionary<string, string>> Headers = new(new string[] { "-H", "--header" }, description: ResString.cmd_header, parseArgument: ParseHeaders) { Arity = ArgumentArity.OneOrMore, AllowMultipleArgumentsPerToken = false };
+    private static readonly Option<Dictionary<string, string>> Headers = new(["-H", "--header"], description: ResString.cmd_header, parseArgument: ParseHeaders) { Arity = ArgumentArity.OneOrMore, AllowMultipleArgumentsPerToken = false };
-        private readonly static Option<LogLevel> LogLevel = new(name: "--log-level", description: ResString.cmd_logLevel, getDefaultValue: () => Common.Log.LogLevel.INFO);
+    private static readonly Option<LogLevel> LogLevel = new(name: "--log-level", description: ResString.cmd_logLevel, getDefaultValue: () => Common.Log.LogLevel.INFO);
-        private readonly static Option<SubtitleFormat> SubtitleFormat = new(name: "--sub-format", description: ResString.cmd_subFormat, getDefaultValue: () => Enum.SubtitleFormat.SRT);
+    private static readonly Option<SubtitleFormat> SubtitleFormat = new(name: "--sub-format", description: ResString.cmd_subFormat, getDefaultValue: () => Enum.SubtitleFormat.SRT);
-        private readonly static Option<bool> AutoSelect = new(new string[] { "--auto-select" }, description: ResString.cmd_autoSelect, getDefaultValue: () => false);
+    private static readonly Option<bool> DisableUpdateCheck = new(["--disable-update-check"], description: ResString.cmd_disableUpdateCheck, getDefaultValue: () => false);
-        private readonly static Option<bool> SubOnly = new(new string[] { "--sub-only" }, description: ResString.cmd_subOnly, getDefaultValue: () => false);
+    private static readonly Option<bool> AutoSelect = new(["--auto-select"], description: ResString.cmd_autoSelect, getDefaultValue: () => false);
-        private readonly static Option<int> ThreadCount = new(new string[] { "--thread-count" }, description: ResString.cmd_threadCount, getDefaultValue: () => Environment.ProcessorCount) { ArgumentHelpName = "number" };
+    private static readonly Option<bool> SubOnly = new(["--sub-only"], description: ResString.cmd_subOnly, getDefaultValue: () => false);
-        private readonly static Option<int> DownloadRetryCount = new(new string[] { "--download-retry-count" }, description: ResString.cmd_downloadRetryCount, getDefaultValue: () => 3) { ArgumentHelpName = "number" };
+    private static readonly Option<int> ThreadCount = new(["--thread-count"], description: ResString.cmd_threadCount, getDefaultValue: () => Environment.ProcessorCount) { ArgumentHelpName = "number" };
-        private readonly static Option<bool> SkipMerge = new(new string[] { "--skip-merge" }, description: ResString.cmd_skipMerge, getDefaultValue: () => false);
+    private static readonly Option<int> DownloadRetryCount = new(["--download-retry-count"], description: ResString.cmd_downloadRetryCount, getDefaultValue: () => 3) { ArgumentHelpName = "number" };
-        private readonly static Option<bool> SkipDownload = new(new string[] { "--skip-download" }, description: ResString.cmd_skipDownload, getDefaultValue: () => false);
+    private static readonly Option<double> HttpRequestTimeout = new(["--http-request-timeout"], description: ResString.cmd_httpRequestTimeout, getDefaultValue: () => 100) { ArgumentHelpName = "seconds" };
-        private readonly static Option<bool> NoDateInfo = new(new string[] { "--no-date-info" }, description: ResString.cmd_noDateInfo, getDefaultValue: () => false);
+    private static readonly Option<bool> SkipMerge = new(["--skip-merge"], description: ResString.cmd_skipMerge, getDefaultValue: () => false);
-        private readonly static Option<bool> BinaryMerge = new(new string[] { "--binary-merge" }, description: ResString.cmd_binaryMerge, getDefaultValue: () => false);
+    private static readonly Option<bool> SkipDownload = new(["--skip-download"], description: ResString.cmd_skipDownload, getDefaultValue: () => false);
-        private readonly static Option<bool> UseFFmpegConcatDemuxer = new(new string[] { "--use-ffmpeg-concat-demuxer" }, description: ResString.cmd_useFFmpegConcatDemuxer, getDefaultValue: () => false);
+    private static readonly Option<bool> NoDateInfo = new(["--no-date-info"], description: ResString.cmd_noDateInfo, getDefaultValue: () => false);
-        private readonly static Option<bool> DelAfterDone = new(new string[] { "--del-after-done" }, description: ResString.cmd_delAfterDone, getDefaultValue: () => true);
+    private static readonly Option<bool> BinaryMerge = new(["--binary-merge"], description: ResString.cmd_binaryMerge, getDefaultValue: () => false);
-        private readonly static Option<bool> AutoSubtitleFix = new(new string[] { "--auto-subtitle-fix" }, description: ResString.cmd_subtitleFix, getDefaultValue: () => true);
+    private static readonly Option<bool> UseFFmpegConcatDemuxer = new(["--use-ffmpeg-concat-demuxer"], description: ResString.cmd_useFFmpegConcatDemuxer, getDefaultValue: () => false);
-        private readonly static Option<bool> CheckSegmentsCount = new(new string[] { "--check-segments-count" }, description: ResString.cmd_checkSegmentsCount, getDefaultValue: () => true);
+    private static readonly Option<bool> DelAfterDone = new(["--del-after-done"], description: ResString.cmd_delAfterDone, getDefaultValue: () => true);
-        private readonly static Option<bool> WriteMetaJson = new(new string[] { "--write-meta-json" }, description: ResString.cmd_writeMetaJson, getDefaultValue: () => true);
+    private static readonly Option<bool> AutoSubtitleFix = new(["--auto-subtitle-fix"], description: ResString.cmd_subtitleFix, getDefaultValue: () => true);
-        private readonly static Option<bool> AppendUrlParams = new(new string[] { "--append-url-params" }, description: ResString.cmd_appendUrlParams, getDefaultValue: () => false);
+    private static readonly Option<bool> CheckSegmentsCount = new(["--check-segments-count"], description: ResString.cmd_checkSegmentsCount, getDefaultValue: () => true);
-        private readonly static Option<bool> MP4RealTimeDecryption = new (new string[] { "--mp4-real-time-decryption" }, description: ResString.cmd_MP4RealTimeDecryption, getDefaultValue: () => false);
+    private static readonly Option<bool> WriteMetaJson = new(["--write-meta-json"], description: ResString.cmd_writeMetaJson, getDefaultValue: () => true);
-        private readonly static Option<bool> UseShakaPackager = new (new string[] { "--use-shaka-packager" }, description: ResString.cmd_useShakaPackager, getDefaultValue: () => false);
+    private static readonly Option<bool> AppendUrlParams = new(["--append-url-params"], description: ResString.cmd_appendUrlParams, getDefaultValue: () => false);
-        private readonly static Option<bool> ForceAnsiConsole = new(new string[] { "--force-ansi-console" }, description: ResString.cmd_forceAnsiConsole);
+    private static readonly Option<bool> MP4RealTimeDecryption = new (["--mp4-real-time-decryption"], description: ResString.cmd_MP4RealTimeDecryption, getDefaultValue: () => false);
-        private readonly static Option<bool> NoAnsiColor = new(new string[] { "--no-ansi-color" }, description: ResString.cmd_noAnsiColor);
+    private static readonly Option<bool> UseShakaPackager = new (["--use-shaka-packager"], description: ResString.cmd_useShakaPackager, getDefaultValue: () => false) { IsHidden = true };
-        private readonly static Option<string?> DecryptionBinaryPath = new(new string[] { "--decryption-binary-path" }, description: ResString.cmd_decryptionBinaryPath) { ArgumentHelpName = "PATH" };
+    private static readonly Option<DecryptEngine> DecryptionEngine = new (["--decryption-engine"], description: ResString.cmd_decryptionEngine, getDefaultValue: () => DecryptEngine.MP4DECRYPT);
-        private readonly static Option<string?> FFmpegBinaryPath = new(new string[] { "--ffmpeg-binary-path" }, description: ResString.cmd_ffmpegBinaryPath) { ArgumentHelpName = "PATH" };
+    private static readonly Option<bool> ForceAnsiConsole = new(["--force-ansi-console"], description: ResString.cmd_forceAnsiConsole);
-        private readonly static Option<string?> BaseUrl = new(new string[] { "--base-url" }, description: ResString.cmd_baseUrl);
+    private static readonly Option<bool> NoAnsiColor = new(["--no-ansi-color"], description: ResString.cmd_noAnsiColor);
-        private readonly static Option<bool> ConcurrentDownload = new(new string[] { "-mt", "--concurrent-download" }, description: ResString.cmd_concurrentDownload, getDefaultValue: () => false);
+    private static readonly Option<string?> DecryptionBinaryPath = new(["--decryption-binary-path"], description: ResString.cmd_decryptionBinaryPath) { ArgumentHelpName = "PATH" };
-        private readonly static Option<bool> NoLog = new(new string[] { "--no-log" }, description: ResString.cmd_noLog, getDefaultValue: () => false);
+    private static readonly Option<string?> FFmpegBinaryPath = new(["--ffmpeg-binary-path"], description: ResString.cmd_ffmpegBinaryPath) { ArgumentHelpName = "PATH" };
-        private readonly static Option<string[]?> AdKeywords = new(new string[] { "--ad-keyword" }, description: ResString.cmd_adKeyword) { ArgumentHelpName = "REG" };
+    private static readonly Option<string?> BaseUrl = new(["--base-url"], description: ResString.cmd_baseUrl);
-        private readonly static Option<long?> MaxSpeed = new(new string[] { "-R", "--max-speed" }, description: ResString.cmd_maxSpeed, parseArgument: ParseSpeedLimit) { ArgumentHelpName = "SPEED" };
+    private static readonly Option<bool> ConcurrentDownload = new(["-mt", "--concurrent-download"], description: ResString.cmd_concurrentDownload, getDefaultValue: () => false);
+    private static readonly Option<bool> NoLog = new(["--no-log"], description: ResString.cmd_noLog, getDefaultValue: () => false);
+    private static readonly Option<bool> AllowHlsMultiExtMap = new(["--allow-hls-multi-ext-map"], description: ResString.cmd_allowHlsMultiExtMap, getDefaultValue: () => false);
+    private static readonly Option<string[]?> AdKeywords = new(["--ad-keyword"], description: ResString.cmd_adKeyword) { ArgumentHelpName = "REG" };
+    private static readonly Option<long?> MaxSpeed = new(["-R", "--max-speed"], description: ResString.cmd_maxSpeed, parseArgument: ParseSpeedLimit) { ArgumentHelpName = "SPEED" };
 
 
-        //代理选项
+    // 代理选项
-        private readonly static Option<bool> UseSystemProxy = new(new string[] { "--use-system-proxy" }, description: ResString.cmd_useSystemProxy, getDefaultValue: () => true);
+    private static readonly Option<bool> UseSystemProxy = new(["--use-system-proxy"], description: ResString.cmd_useSystemProxy, getDefaultValue: () => true);
-        private readonly static Option<WebProxy?> CustomProxy = new(new string[] { "--custom-proxy" }, description: ResString.cmd_customProxy, parseArgument: ParseProxy) { ArgumentHelpName = "URL" };
+    private static readonly Option<WebProxy?> CustomProxy = new(["--custom-proxy"], description: ResString.cmd_customProxy, parseArgument: ParseProxy) { ArgumentHelpName = "URL" };
 
-        //只下载部分分片
+    // 只下载部分分片
-        private readonly static Option<CustomRange?> CustomRange = new(new string[] { "--custom-range" }, description: ResString.cmd_customRange, parseArgument: ParseCustomRange) { ArgumentHelpName = "RANGE" };
+    private static readonly Option<CustomRange?> CustomRange = new(["--custom-range"], description: ResString.cmd_customRange, parseArgument: ParseCustomRange) { ArgumentHelpName = "RANGE" };
 
 
-        //morehelp
+    // morehelp
-        private readonly static Option<string?> MoreHelp = new(new string[] { "--morehelp" }, description: ResString.cmd_moreHelp) { ArgumentHelpName = "OPTION" };
+    private static readonly Option<string?> MoreHelp = new(["--morehelp"], description: ResString.cmd_moreHelp) { ArgumentHelpName = "OPTION" };
 
-        //自定义KEY等
+    // 自定义KEY等
-        private readonly static Option<EncryptMethod?> CustomHLSMethod = new(name: "--custom-hls-method", description: ResString.cmd_customHLSMethod) { ArgumentHelpName = "METHOD" };
+    private static readonly Option<EncryptMethod?> CustomHLSMethod = new(name: "--custom-hls-method", description: ResString.cmd_customHLSMethod) { ArgumentHelpName = "METHOD" };
-        private readonly static Option<byte[]?> CustomHLSKey = new(name: "--custom-hls-key", description: ResString.cmd_customHLSKey, parseArgument: ParseHLSCustomKey) { ArgumentHelpName = "FILE|HEX|BASE64" };
+    private static readonly Option<byte[]?> CustomHLSKey = new(name: "--custom-hls-key", description: ResString.cmd_customHLSKey, parseArgument: ParseHLSCustomKey) { ArgumentHelpName = "FILE|HEX|BASE64" };
-        private readonly static Option<byte[]?> CustomHLSIv = new(name: "--custom-hls-iv", description: ResString.cmd_customHLSIv, parseArgument: ParseHLSCustomKey) { ArgumentHelpName = "FILE|HEX|BASE64" };
+    private static readonly Option<byte[]?> CustomHLSIv = new(name: "--custom-hls-iv", description: ResString.cmd_customHLSIv, parseArgument: ParseHLSCustomKey) { ArgumentHelpName = "FILE|HEX|BASE64" };
 
-        //任务开始时间
+    // 任务开始时间
-        private readonly static Option<DateTime?> TaskStartAt = new(new string[] { "--task-start-at" }, description: ResString.cmd_taskStartAt, parseArgument: ParseStartTime) { ArgumentHelpName = "yyyyMMddHHmmss" };
+    private static readonly Option<DateTime?> TaskStartAt = new(["--task-start-at"], description: ResString.cmd_taskStartAt, parseArgument: ParseStartTime) { ArgumentHelpName = "yyyyMMddHHmmss" };
 
 
-        //直播相关
+    // 直播相关
-        private readonly static Option<bool> LivePerformAsVod = new(new string[] { "--live-perform-as-vod" }, description: ResString.cmd_livePerformAsVod, getDefaultValue: () => false);
+    private static readonly Option<bool> LivePerformAsVod = new(["--live-perform-as-vod"], description: ResString.cmd_livePerformAsVod, getDefaultValue: () => false);
-        private readonly static Option<bool> LiveRealTimeMerge = new(new string[] { "--live-real-time-merge" }, description: ResString.cmd_liveRealTimeMerge, getDefaultValue: () => false);
+    private static readonly Option<bool> LiveRealTimeMerge = new(["--live-real-time-merge"], description: ResString.cmd_liveRealTimeMerge, getDefaultValue: () => false);
-        private readonly static Option<bool> LiveKeepSegments = new(new string[] { "--live-keep-segments" }, description: ResString.cmd_liveKeepSegments, getDefaultValue: () => true);
+    private static readonly Option<bool> LiveKeepSegments = new(["--live-keep-segments"], description: ResString.cmd_liveKeepSegments, getDefaultValue: () => true);
-        private readonly static Option<bool> LivePipeMux = new(new string[] { "--live-pipe-mux" }, description: ResString.cmd_livePipeMux, getDefaultValue: () => false);
+    private static readonly Option<bool> LivePipeMux = new(["--live-pipe-mux"], description: ResString.cmd_livePipeMux, getDefaultValue: () => false);
-        private readonly static Option<TimeSpan?> LiveRecordLimit = new(new string[] { "--live-record-limit" }, description: ResString.cmd_liveRecordLimit, parseArgument: ParseLiveLimit) { ArgumentHelpName = "HH:mm:ss" };
+    private static readonly Option<TimeSpan?> LiveRecordLimit = new(["--live-record-limit"], description: ResString.cmd_liveRecordLimit, parseArgument: ParseLiveLimit) { ArgumentHelpName = "HH:mm:ss" };
-        private readonly static Option<int?> LiveWaitTime = new(new string[] { "--live-wait-time" }, description: ResString.cmd_liveWaitTime) { ArgumentHelpName = "SEC" };
+    private static readonly Option<int?> LiveWaitTime = new(["--live-wait-time"], description: ResString.cmd_liveWaitTime) { ArgumentHelpName = "SEC" };
-        private readonly static Option<int> LiveTakeCount = new(new string[] { "--live-take-count" }, description: ResString.cmd_liveTakeCount, getDefaultValue: () => 16) { ArgumentHelpName = "NUM" };
+    private static readonly Option<int> LiveTakeCount = new(["--live-take-count"], description: ResString.cmd_liveTakeCount, getDefaultValue: () => 16) { ArgumentHelpName = "NUM" };
-        private readonly static Option<bool> LiveFixVttByAudio = new(new string[] { "--live-fix-vtt-by-audio" }, description: ResString.cmd_liveFixVttByAudio, getDefaultValue: () => false);
+    private static readonly Option<bool> LiveFixVttByAudio = new(["--live-fix-vtt-by-audio"], description: ResString.cmd_liveFixVttByAudio, getDefaultValue: () => false);
 
 
-        //复杂命令行如下
+    // 复杂命令行如下
-        private readonly static Option<MuxOptions?> MuxAfterDone = new(new string[] { "-M", "--mux-after-done" }, description: ResString.cmd_muxAfterDone, parseArgument: ParseMuxAfterDone) { ArgumentHelpName = "OPTIONS" };
+    private static readonly Option<MuxOptions?> MuxAfterDone = new(["-M", "--mux-after-done"], description: ResString.cmd_muxAfterDone, parseArgument: ParseMuxAfterDone) { ArgumentHelpName = "OPTIONS" };
-        private readonly static Option<List<OutputFile>> MuxImports = new("--mux-import", description: ResString.cmd_muxImport, parseArgument: ParseImports) { Arity = ArgumentArity.OneOrMore, AllowMultipleArgumentsPerToken = false, ArgumentHelpName = "OPTIONS" };
+    private static readonly Option<List<OutputFile>> MuxImports = new("--mux-import", description: ResString.cmd_muxImport, parseArgument: ParseImports) { Arity = ArgumentArity.OneOrMore, AllowMultipleArgumentsPerToken = false, ArgumentHelpName = "OPTIONS" };
-        private readonly static Option<StreamFilter?> VideoFilter = new(new string[] { "-sv", "--select-video" }, description: ResString.cmd_selectVideo, parseArgument: ParseStreamFilter) { ArgumentHelpName = "OPTIONS" };
+    private static readonly Option<StreamFilter?> VideoFilter = new(["-sv", "--select-video"], description: ResString.cmd_selectVideo, parseArgument: ParseStreamFilter) { ArgumentHelpName = "OPTIONS" };
-        private readonly static Option<StreamFilter?> AudioFilter = new(new string[] { "-sa", "--select-audio" }, description: ResString.cmd_selectAudio, parseArgument: ParseStreamFilter) { ArgumentHelpName = "OPTIONS" };
+    private static readonly Option<StreamFilter?> AudioFilter = new(["-sa", "--select-audio"], description: ResString.cmd_selectAudio, parseArgument: ParseStreamFilter) { ArgumentHelpName = "OPTIONS" };
-        private readonly static Option<StreamFilter?> SubtitleFilter = new(new string[] { "-ss", "--select-subtitle" }, description: ResString.cmd_selectSubtitle, parseArgument: ParseStreamFilter) { ArgumentHelpName = "OPTIONS" };
+    private static readonly Option<StreamFilter?> SubtitleFilter = new(["-ss", "--select-subtitle"], description: ResString.cmd_selectSubtitle, parseArgument: ParseStreamFilter) { ArgumentHelpName = "OPTIONS" };
 
-        private readonly static Option<StreamFilter?> DropVideoFilter = new(new string[] { "-dv", "--drop-video" }, description: ResString.cmd_dropVideo, parseArgument: ParseStreamFilter) { ArgumentHelpName = "OPTIONS" };
+    private static readonly Option<StreamFilter?> DropVideoFilter = new(["-dv", "--drop-video"], description: ResString.cmd_dropVideo, parseArgument: ParseStreamFilter) { ArgumentHelpName = "OPTIONS" };
-        private readonly static Option<StreamFilter?> DropAudioFilter = new(new string[] { "-da", "--drop-audio" }, description: ResString.cmd_dropAudio, parseArgument: ParseStreamFilter) { ArgumentHelpName = "OPTIONS" };
+    private static readonly Option<StreamFilter?> DropAudioFilter = new(["-da", "--drop-audio"], description: ResString.cmd_dropAudio, parseArgument: ParseStreamFilter) { ArgumentHelpName = "OPTIONS" };
-        private readonly static Option<StreamFilter?> DropSubtitleFilter = new(new string[] { "-ds", "--drop-subtitle" }, description: ResString.cmd_dropSubtitle, parseArgument: ParseStreamFilter) { ArgumentHelpName = "OPTIONS" };
+    private static readonly Option<StreamFilter?> DropSubtitleFilter = new(["-ds", "--drop-subtitle"], description: ResString.cmd_dropSubtitle, parseArgument: ParseStreamFilter) { ArgumentHelpName = "OPTIONS" };
 
     /// <summary>
-        /// 解析录制直播时长限制
+    /// 解析下载速度限制
     /// </summary>
     /// <param name="result"></param>
     /// <returns></returns>
     private static long? ParseSpeedLimit(ArgumentResult result)
     {
-            var input = result.Tokens.First().Value.ToUpper();
+        var input = result.Tokens[0].Value.ToUpper();
         try
         {
-                var reg = new Regex("([\\d\\\\.]+)(M|K)");
+            var reg = SpeedStrRegex();
-                if (!reg.IsMatch(input)) throw new ArgumentException();
+            if (!reg.IsMatch(input)) throw new ArgumentException($"Invalid Speed Limit: {input}");
 
             var number = double.Parse(reg.Match(input).Groups[1].Value);
             if (reg.Match(input).Groups[2].Value == "M")
                 return (long)(number * 1024 * 1024);
-                else
             return (long)(number * 1024);
         }
         catch (Exception)
@@ -140,8 +144,8 @@ namespace N_m3u8DL_RE.CommandLine
     /// <exception cref="ArgumentException"></exception>
     private static CustomRange? ParseCustomRange(ArgumentResult result)
     {
-            var input = result.Tokens.First().Value;
+        var input = result.Tokens[0].Value;
-            //支持的种类 0-100; 01:00:00-02:30:00; -300; 300-; 05:00-; -03:00;
+        // 支持的种类 0-100; 01:00:00-02:30:00; -300; 300-; 05:00-; -03:00;
         try
         {
             if (string.IsNullOrEmpty(input))
@@ -151,7 +155,7 @@ namespace N_m3u8DL_RE.CommandLine
             if (arr.Length != 2)
                 throw new ArgumentException("Bad format!");
 
-                if (input.Contains(":"))
+            if (input.Contains(':'))
             {
                 return new CustomRange()
                 {
@@ -160,7 +164,8 @@ namespace N_m3u8DL_RE.CommandLine
                     EndSec = arr[1] == "" ? double.MaxValue : OtherUtil.ParseDur(arr[1]).TotalSeconds,
                 };
             }
-                else if (RangeRegex().IsMatch(input))
+
+            if (RangeRegex().IsMatch(input))
             {
                 var left = RangeRegex().Match(input).Groups[1].Value;
                 var right = RangeRegex().Match(input).Groups[2].Value;
@@ -189,7 +194,7 @@ namespace N_m3u8DL_RE.CommandLine
     /// <exception cref="ArgumentException"></exception>
     private static WebProxy? ParseProxy(ArgumentResult result)
     {
-            var input = result.Tokens.First().Value;
+        var input = result.Tokens[0].Value;
         try
         {
             if (string.IsNullOrEmpty(input))
@@ -218,16 +223,15 @@ namespace N_m3u8DL_RE.CommandLine
     /// <returns></returns>
     private static byte[]? ParseHLSCustomKey(ArgumentResult result)
     {
-            var input = result.Tokens.First().Value;
+        var input = result.Tokens[0].Value;
         try
         {
             if (string.IsNullOrEmpty(input))
                 return null;
             if (File.Exists(input))
                 return File.ReadAllBytes(input);
-                else if (HexUtil.TryParseHexString(input, out byte[]? bytes))
+            if (HexUtil.TryParseHexString(input, out byte[]? bytes))
                 return bytes;
-                else
             return Convert.FromBase64String(input);
         }
         catch (Exception)
@@ -244,7 +248,7 @@ namespace N_m3u8DL_RE.CommandLine
     /// <returns></returns>
     private static TimeSpan? ParseLiveLimit(ArgumentResult result)
     {
-            var input = result.Tokens.First().Value;
+        var input = result.Tokens[0].Value;
         try
         {
             return OtherUtil.ParseDur(input);
@@ -263,7 +267,7 @@ namespace N_m3u8DL_RE.CommandLine
     /// <returns></returns>
     private static DateTime? ParseStartTime(ArgumentResult result)
     {
-            var input = result.Tokens.First().Value;
+        var input = result.Tokens[0].Value;
         try
         {
             CultureInfo provider = CultureInfo.InvariantCulture;
@@ -278,7 +282,7 @@ namespace N_m3u8DL_RE.CommandLine
 
     private static string? ParseSaveName(ArgumentResult result)
     {
-            var input = result.Tokens.First().Value;
+        var input = result.Tokens[0].Value;
         var newName = OtherUtil.GetValidFileName(input);
         if (string.IsNullOrEmpty(newName))
         {
@@ -296,11 +300,11 @@ namespace N_m3u8DL_RE.CommandLine
     private static StreamFilter? ParseStreamFilter(ArgumentResult result)
     {
         var streamFilter = new StreamFilter();
-            var input = result.Tokens.First().Value;
+        var input = result.Tokens[0].Value;
         var p = new ComplexParamParser(input);
 
 
-            //目标范围
+        // 目标范围
         var forStr = "";
         if (input == ForStrRegex().Match(input).Value)
         {
@@ -407,7 +411,7 @@ namespace N_m3u8DL_RE.CommandLine
         foreach (var item in result.Tokens)
         {
             var p = new ComplexParamParser(item.Value);
-                var path = p.GetValue("path") ?? item.Value; //若未获取到，直接整个字符串作为path
+            var path = p.GetValue("path") ?? item.Value; // 若未获取到，直接整个字符串作为path
             var lang = p.GetValue("lang");
             var name = p.GetValue("name");
             if (string.IsNullOrEmpty(path) || !File.Exists(path))
@@ -434,44 +438,45 @@ namespace N_m3u8DL_RE.CommandLine
     /// <returns></returns>
     private static MuxOptions? ParseMuxAfterDone(ArgumentResult result)
     {
-            var v = result.Tokens.First().Value;
+        var v = result.Tokens[0].Value;
         var p = new ComplexParamParser(v);
-            //混流格式
+        // 混流格式
-            var format = p.GetValue("format") ?? v.Split(':')[0]; //若未获取到，直接:前的字符串作为format解析
+        var format = p.GetValue("format") ?? v.Split(':')[0]; // 若未获取到，直接:前的字符串作为format解析
-            if (format != "mp4" && format != "mkv")
+        var parseResult = System.Enum.TryParse(format.ToUpperInvariant(), out MuxFormat muxFormat);
+        if (!parseResult)
         {
             result.ErrorMessage = $"format={format} not valid";
             return null;
         }
-            //混流器
+        // 混流器
         var muxer = p.GetValue("muxer") ?? "ffmpeg";
         if (muxer != "ffmpeg" && muxer != "mkvmerge")
         {
             result.ErrorMessage = $"muxer={muxer} not valid";
             return null;
         }
-            //混流器路径
+        // 混流器路径
         var bin_path = p.GetValue("bin_path") ?? "auto";
         if (string.IsNullOrEmpty(bin_path))
         {
             result.ErrorMessage = $"bin_path={bin_path} not valid";
             return null;
         }
-            //是否删除
+        // 是否删除
         var keep = p.GetValue("keep") ?? "false";
         if (keep != "true" && keep != "false")
         {
             result.ErrorMessage = $"keep={keep} not valid";
             return null;
         }
-            //是否忽略字幕
+        // 是否忽略字幕
         var skipSub = p.GetValue("skip_sub") ?? "false";
         if (skipSub != "true" && skipSub != "false")
         {
             result.ErrorMessage = $"skip_sub={keep} not valid";
             return null;
         }
-            //冲突检测
+        // 冲突检测
         if (muxer == "mkvmerge" && format == "mp4")
         {
             result.ErrorMessage = $"mkvmerge can not do mp4";
@@ -480,7 +485,7 @@ namespace N_m3u8DL_RE.CommandLine
         return new MuxOptions()
         {
             UseMkvmerge = muxer == "mkvmerge",
-                MuxToMp4 = format == "mp4",
+            MuxFormat = muxFormat,
             KeepFiles = keep == "true",
             SkipSubtitle = skipSub == "true",
             BinPath = bin_path == "auto" ? null : bin_path
@@ -498,6 +503,7 @@ namespace N_m3u8DL_RE.CommandLine
                 NoAnsiColor = bindingContext.ParseResult.GetValueForOption(NoAnsiColor),
                 LogLevel = bindingContext.ParseResult.GetValueForOption(LogLevel),
                 AutoSelect = bindingContext.ParseResult.GetValueForOption(AutoSelect),
+                DisableUpdateCheck = bindingContext.ParseResult.GetValueForOption(DisableUpdateCheck),
                 SkipMerge = bindingContext.ParseResult.GetValueForOption(SkipMerge),
                 BinaryMerge = bindingContext.ParseResult.GetValueForOption(BinaryMerge),
                 UseFFmpegConcatDemuxer = bindingContext.ParseResult.GetValueForOption(UseFFmpegConcatDemuxer),
@@ -519,10 +525,12 @@ namespace N_m3u8DL_RE.CommandLine
                 UrlProcessorArgs = bindingContext.ParseResult.GetValueForOption(UrlProcessorArgs),
                 MP4RealTimeDecryption = bindingContext.ParseResult.GetValueForOption(MP4RealTimeDecryption),
                 UseShakaPackager = bindingContext.ParseResult.GetValueForOption(UseShakaPackager),
+                DecryptionEngine = bindingContext.ParseResult.GetValueForOption(DecryptionEngine),
                 DecryptionBinaryPath = bindingContext.ParseResult.GetValueForOption(DecryptionBinaryPath),
                 FFmpegBinaryPath = bindingContext.ParseResult.GetValueForOption(FFmpegBinaryPath),
                 KeyTextFile = bindingContext.ParseResult.GetValueForOption(KeyTextFile),
                 DownloadRetryCount = bindingContext.ParseResult.GetValueForOption(DownloadRetryCount),
+                HttpRequestTimeout = bindingContext.ParseResult.GetValueForOption(HttpRequestTimeout),
                 BaseUrl = bindingContext.ParseResult.GetValueForOption(BaseUrl),
                 MuxImports = bindingContext.ParseResult.GetValueForOption(MuxImports),
                 ConcurrentDownload = bindingContext.ParseResult.GetValueForOption(ConcurrentDownload),
@@ -546,6 +554,7 @@ namespace N_m3u8DL_RE.CommandLine
                 LiveTakeCount = bindingContext.ParseResult.GetValueForOption(LiveTakeCount),
                 NoDateInfo = bindingContext.ParseResult.GetValueForOption(NoDateInfo),
                 NoLog = bindingContext.ParseResult.GetValueForOption(NoLog),
+                AllowHlsMultiExtMap = bindingContext.ParseResult.GetValueForOption(AllowHlsMultiExtMap),
                 AdKeywords = bindingContext.ParseResult.GetValueForOption(AdKeywords),
                 MaxSpeed = bindingContext.ParseResult.GetValueForOption(MaxSpeed),
             };
@@ -559,7 +568,7 @@ namespace N_m3u8DL_RE.CommandLine
                 option.Headers = parsedHeaders;
 
 
-                //以用户选择语言为准优先
+            // 以用户选择语言为准优先
             if (option.UILanguage != null)
             {
                 CultureInfo.DefaultThreadCurrentCulture = new CultureInfo(option.UILanguage);
@@ -567,16 +576,14 @@ namespace N_m3u8DL_RE.CommandLine
                 Thread.CurrentThread.CurrentCulture = CultureInfo.GetCultureInfo(option.UILanguage);
             }
 
-                //混流设置
+            // 混流设置
             var muxAfterDoneValue = bindingContext.ParseResult.GetValueForOption(MuxAfterDone);
-                if (muxAfterDoneValue != null)
+            if (muxAfterDoneValue == null) return option;
-                {
+            
             option.MuxAfterDone = true;
             option.MuxOptions = muxAfterDoneValue;
             if (muxAfterDoneValue.UseMkvmerge) option.MkvmergeBinaryPath = muxAfterDoneValue.BinPath;
             else option.FFmpegBinaryPath ??= muxAfterDoneValue.BinPath;
-                }
-
 
             return option;
         }
@@ -606,19 +613,19 @@ namespace N_m3u8DL_RE.CommandLine
 
         var rootCommand = new RootCommand(VERSION_INFO)
         {
-                Input, TmpDir, SaveDir, SaveName, BaseUrl, ThreadCount, DownloadRetryCount, ForceAnsiConsole, NoAnsiColor,AutoSelect, SkipMerge, SkipDownload, CheckSegmentsCount,
+            Input, TmpDir, SaveDir, SaveName, BaseUrl, ThreadCount, DownloadRetryCount, HttpRequestTimeout, ForceAnsiConsole, NoAnsiColor,AutoSelect, SkipMerge, SkipDownload, CheckSegmentsCount,
             BinaryMerge, UseFFmpegConcatDemuxer, DelAfterDone, NoDateInfo, NoLog, WriteMetaJson, AppendUrlParams, ConcurrentDownload, Headers, /**SavePattern,**/ SubOnly, SubtitleFormat, AutoSubtitleFix,
             FFmpegBinaryPath,
-                LogLevel, UILanguage, UrlProcessorArgs, Keys, KeyTextFile, DecryptionBinaryPath, UseShakaPackager, MP4RealTimeDecryption,
+            LogLevel, UILanguage, UrlProcessorArgs, Keys, KeyTextFile, DecryptionEngine, DecryptionBinaryPath, UseShakaPackager, MP4RealTimeDecryption,
             MaxSpeed,
             MuxAfterDone,
             CustomHLSMethod, CustomHLSKey, CustomHLSIv, UseSystemProxy, CustomProxy, CustomRange, TaskStartAt,
             LivePerformAsVod, LiveRealTimeMerge, LiveKeepSegments, LivePipeMux, LiveFixVttByAudio, LiveRecordLimit, LiveWaitTime, LiveTakeCount,
-                MuxImports, VideoFilter, AudioFilter, SubtitleFilter, DropVideoFilter, DropAudioFilter, DropSubtitleFilter, AdKeywords, MoreHelp
+            MuxImports, VideoFilter, AudioFilter, SubtitleFilter, DropVideoFilter, DropAudioFilter, DropSubtitleFilter, AdKeywords, DisableUpdateCheck, AllowHlsMultiExtMap, MoreHelp
         };
 
         rootCommand.TreatUnmatchedTokensAsErrors = true;
-            rootCommand.SetHandler(async (myOption) => await action(myOption), new MyOptionBinder());
+        rootCommand.SetHandler(async myOption => await action(myOption), new MyOptionBinder());
 
         var parser = new CommandLineBuilder(rootCommand)
             .UseDefaults()
@@ -638,5 +645,4 @@ namespace N_m3u8DL_RE.CommandLine
 
         return await parser.InvokeAsync(args);
     }
-    }
 }

src/N_m3u8DL-RE/CommandLine/ComplexParamParser.cs

@@ -1,14 +1,10 @@
-using System;
+using System.Text;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.CommandLine
+namespace N_m3u8DL_RE.CommandLine;
+
+internal class ComplexParamParser
 {
-    internal class ComplexParamParser
+    private readonly string _arg;
-    {
-        private string _arg;
     public ComplexParamParser(string arg)
     {
         _arg = arg;
@@ -20,7 +16,7 @@ namespace N_m3u8DL_RE.CommandLine
 
         try
         {
-                var index = _arg.IndexOf(key + "=");
+            var index = _arg.IndexOf(key + "=", StringComparison.Ordinal);
             if (index == -1) return (_arg.Contains(key) && _arg.EndsWith(key)) ? "true" : null;
 
             var chars = _arg[(index + key.Length + 1)..].ToCharArray();
@@ -47,7 +43,7 @@ namespace N_m3u8DL_RE.CommandLine
 
             var resultStr = result.ToString().Trim().Trim('\"').Trim('\'');
 
-                //不应该有引号出现
+            // 不应该有引号出现
             if (resultStr.Contains('\"') || resultStr.Contains('\'')) throw new Exception();
 
             return resultStr;
@@ -57,5 +53,4 @@ namespace N_m3u8DL_RE.CommandLine
             throw new ArgumentException($"Parse Argument [{key}] failed!");
         }
     }
-    }
 }

src/N_m3u8DL-RE/CommandLine/MyOption.cs

@@ -4,10 +4,10 @@ using N_m3u8DL_RE.Entity;
 using N_m3u8DL_RE.Enum;
 using System.Net;
 
-namespace N_m3u8DL_RE.CommandLine
+namespace N_m3u8DL_RE.CommandLine;
+
+internal class MyOption
 {
-    internal class MyOption
-    {
     /// <summary>
     /// See: <see cref="CommandInvoker.Input"/>.
     /// </summary>
@@ -53,10 +53,18 @@ namespace N_m3u8DL_RE.CommandLine
     /// </summary>
     public bool NoLog { get; set; }
     /// <summary>
+    /// See: <see cref="CommandInvoker.AllowHlsMultiExtMap"/>.
+    /// </summary>
+    public bool AllowHlsMultiExtMap { get; set; }
+    /// <summary>
     /// See: <see cref="CommandInvoker.AutoSelect"/>.
     /// </summary>
     public bool AutoSelect { get; set; }
     /// <summary>
+    /// See: <see cref="CommandInvoker.DisableUpdateCheck"/>.
+    /// </summary>
+    public bool DisableUpdateCheck { get; set; }
+    /// <summary>
     /// See: <see cref="CommandInvoker.SubOnly"/>.
     /// </summary>
     public bool SubOnly { get; set; }
@@ -69,6 +77,10 @@ namespace N_m3u8DL_RE.CommandLine
     /// </summary>
     public int DownloadRetryCount { get; set; }
     /// <summary>
+    /// See: <see cref="CommandInvoker.HttpRequestTimeout"/>.
+    /// </summary>
+    public double HttpRequestTimeout { get; set; }
+    /// <summary>
     /// See: <see cref="CommandInvoker.LiveRecordLimit"/>.
     /// </summary>
     public TimeSpan? LiveRecordLimit { get; set; }
@@ -127,8 +139,13 @@ namespace N_m3u8DL_RE.CommandLine
     /// <summary>
     /// See: <see cref="CommandInvoker.UseShakaPackager"/>.
     /// </summary>
+    [Obsolete("Use DecryptionEngine instead")]
     public bool UseShakaPackager { get; set; }
     /// <summary>
+    /// See: <see cref="CommandInvoker.DecryptionEngine"/>.
+    /// </summary>
+    public DecryptEngine DecryptionEngine { get; set; }
+    /// <summary>
     /// See: <see cref="CommandInvoker.MuxAfterDone"/>.
     /// </summary>
     public bool MuxAfterDone { get; set; }
@@ -244,8 +261,8 @@ namespace N_m3u8DL_RE.CommandLine
     /// See: <see cref="CommandInvoker.LiveTakeCount"/>.
     /// </summary>
     public int LiveTakeCount { get; set; }
-        public MuxOptions MuxOptions { get; set; }
+    public MuxOptions? MuxOptions { get; set; }
-        //public bool LiveWriteHLS { get; set; } = true;
+    // public bool LiveWriteHLS { get; set; } = true;
     /// <summary>
     /// See: <see cref="CommandInvoker.LivePipeMux"/>.
     /// </summary>
@@ -254,5 +271,4 @@ namespace N_m3u8DL_RE.CommandLine
     /// See: <see cref="CommandInvoker.LiveFixVttByAudio"/>.
     /// </summary>
     public bool LiveFixVttByAudio { get; set; }
-    }
 }

src/N_m3u8DL-RE/Config/DownloaderConfig.cs

@@ -1,16 +1,9 @@
 using N_m3u8DL_RE.CommandLine;
-using N_m3u8DL_RE.Enum;
-using N_m3u8DL_RE.Parser.Config;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Config
+namespace N_m3u8DL_RE.Config;
+
+internal class DownloaderConfig
 {
-    internal class DownloaderConfig
-    {
     public required MyOption MyOptions { get; set; }
 
     /// <summary>
@@ -29,5 +22,4 @@ namespace N_m3u8DL_RE.Config
     /// 请求头
     /// </summary>
     public Dictionary<string, string> Headers { get; set; } = new Dictionary<string, string>();
-    }
 }

src/N_m3u8DL-RE/Crypto/AESUtil.cs

@@ -1,14 +1,9 @@
-using System;
+using System.Security.Cryptography;
-using System.Collections.Generic;
-using System.Linq;
-using System.Security.Cryptography;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Crypto
+namespace N_m3u8DL_RE.Crypto;
+
+internal static class AESUtil
 {
-    internal class AESUtil
-    {
     /// <summary>
     /// AES-128解密，解密后原地替换文件
     /// </summary>
@@ -40,5 +35,4 @@ namespace N_m3u8DL_RE.Crypto
         byte[] resultArray = cTransform.TransformFinalBlock(inBuff, 0, inBuff.Length);
         return resultArray;
     }
-    }
 }

src/N_m3u8DL-RE/Crypto/ChaCha20Util.cs

@@ -1,14 +1,9 @@
 using CSChaCha20;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Crypto
+namespace N_m3u8DL_RE.Crypto;
+
+internal static class ChaCha20Util
 {
-    internal class ChaCha20Util
-    {
     public static byte[] DecryptPer1024Bytes(byte[] encryptedBuff, byte[] keyBytes, byte[] nonceBytes)
     {
         if (keyBytes.Length != 32)
@@ -39,5 +34,4 @@ namespace N_m3u8DL_RE.Crypto
 
         return decStream.ToArray();
     }
-    }
 }

src/N_m3u8DL-RE/Directory.Build.props

@@ -11,12 +11,12 @@
     <SatelliteResourceLanguages>zh-CN;zh-TW;en-US</SatelliteResourceLanguages>
     <PublishAot>true</PublishAot>
     <StripSymbols>true</StripSymbols>
-	  <ObjCopyName Condition="'$(RuntimeIdentifier)' == 'linux-arm64'">aarch64-linux-gnu-objcopy</ObjCopyName>
+    <ObjCopyName Condition="'$(RuntimeIdentifier)' == 'linux-arm64' or '$(RuntimeIdentifier)' == 'linux-musl-arm64'">aarch64-linux-gnu-objcopy</ObjCopyName>
   </PropertyGroup>
 
-	<ItemGroup Condition="'$(PublishAot)' == 'true' and '$(RuntimeIdentifier)' != 'win-arm64' and '$(RuntimeIdentifier)' != 'linux-arm64' and '$(RuntimeIdentifier)' != 'osx-arm64' and '$(RuntimeIdentifier)' != 'osx-x64'">
+    <!--<ItemGroup Condition="'$(PublishAot)' == 'true' and '$(RuntimeIdentifier)' != 'win-arm64' and '$(RuntimeIdentifier)' != 'linux-arm64' and '$(RuntimeIdentifier)' != 'osx-arm64' and '$(RuntimeIdentifier)' != 'osx-x64'">
-		<PackageReference Include="PublishAotCompressed" Version="1.0.0" />
+        <PackageReference Include="PublishAotCompressed" Version="1.0.3" />
-	</ItemGroup>
+    </ItemGroup>-->
     
   <ItemGroup>
     <RdXmlFile Include="rd.xml" />

src/N_m3u8DL-RE/DownloadManager/HTTPLiveRecordManager.cs

@@ -1,7 +1,5 @@
-using Mp4SubtitleParser;
+using N_m3u8DL_RE.Column;
-using N_m3u8DL_RE.Column;
 using N_m3u8DL_RE.Common.Entity;
-using N_m3u8DL_RE.Common.Enum;
 using N_m3u8DL_RE.Common.Log;
 using N_m3u8DL_RE.Common.Resource;
 using N_m3u8DL_RE.Common.Util;
@@ -11,35 +9,26 @@ using N_m3u8DL_RE.Entity;
 using N_m3u8DL_RE.Parser;
 using N_m3u8DL_RE.Util;
 using Spectre.Console;
-using Spectre.Console.Rendering;
-using System;
 using System.Collections.Concurrent;
-using System.IO;
-using System.Net.Http.Headers;
-using System.Reflection.PortableExecutable;
 using System.Text;
-using System.Threading;
-using System.Threading.Tasks;
-using System.Threading.Tasks.Dataflow;
-using System.Xml.Linq;
 
-namespace N_m3u8DL_RE.DownloadManager
+namespace N_m3u8DL_RE.DownloadManager;
+
+internal class HTTPLiveRecordManager
 {
-    internal class HTTPLiveRecordManager
-    {
     IDownloader Downloader;
     DownloaderConfig DownloaderConfig;
     StreamExtractor StreamExtractor;
     List<StreamSpec> SelectedSteams;
-        List<OutputFile> OutputFiles = new();
+    List<OutputFile> OutputFiles = [];
     DateTime NowDateTime;
     DateTime? PublishDateTime;
     bool STOP_FLAG = false;
     bool READ_IFO = false;
-        ConcurrentDictionary<int, int> RecordingDurDic = new(); //已录制时长
+    ConcurrentDictionary<int, int> RecordingDurDic = new(); // 已录制时长
-        ConcurrentDictionary<int, double> RecordingSizeDic = new(); //已录制大小
+    ConcurrentDictionary<int, double> RecordingSizeDic = new(); // 已录制大小
-        CancellationTokenSource CancellationTokenSource = new(); //取消Wait
+    CancellationTokenSource CancellationTokenSource = new(); // 取消Wait
-        List<byte> InfoBuffer = new List<byte>(188 * 5000); //5000个分包中解析信息，没有就算了
+    List<byte> InfoBuffer = new List<byte>(188 * 5000); // 5000个分包中解析信息，没有就算了
 
     public HTTPLiveRecordManager(DownloaderConfig downloaderConfig, List<StreamSpec> selectedSteams, StreamExtractor streamExtractor)
     {
@@ -63,7 +52,7 @@ namespace N_m3u8DL_RE.DownloadManager
 
         Logger.Debug($"dirName: {dirName}; saveDir: {saveDir}; saveName: {saveName}");
 
-            //创建文件夹
+        // 创建文件夹
         if (!Directory.Exists(saveDir)) Directory.CreateDirectory(saveDir);
 
         using var request = new HttpRequestMessage(HttpMethod.Get, new Uri(streamSpec.Url));
@@ -83,10 +72,10 @@ namespace N_m3u8DL_RE.DownloadManager
         var buffer = new byte[16 * 1024];
         var size = 0;
 
-            //计时器
+        // 计时器
-            TimeCounterAsync();
+        _ = TimeCounterAsync();
-            //读取INFO
+        // 读取INFO
-            ReadInfoAsync();
+        _ = ReadInfoAsync();
 
         try
         {
@@ -118,7 +107,7 @@ namespace N_m3u8DL_RE.DownloadManager
             await Task.Delay(200);
             if (InfoBuffer.Count < 188 * 5000) continue;
 
-                UInt16 ConvertToUint16(IEnumerable<byte> bytes)
+            ushort ConvertToUint16(IEnumerable<byte> bytes)
             {
                 if (BitConverter.IsLittleEndian)
                     bytes = bytes.Reverse();
@@ -137,16 +126,16 @@ namespace N_m3u8DL_RE.DownloadManager
                     var tsHeaderInt = BitConverter.ToUInt32(BitConverter.IsLittleEndian ? tsData.Take(4).Reverse().ToArray() : tsData.Take(4).ToArray(), 0);
                     var pid = (tsHeaderInt & 0x1fff00) >> 8;
                     var tsPayload = tsData.Skip(4);
-                        //PAT
+                    // PAT
                     if (pid == 0x0000)
                     {
                         programId = ConvertToUint16(tsPayload.Skip(9).Take(2)).ToString();
                     }
-                        //SDT, BAT, ST
+                    // SDT, BAT, ST
                     else if (pid == 0x0011)
                     {
                         var tableId = (int)tsPayload.Skip(1).First();
-                            //Current TS Info
+                        // Current TS Info
                         if (tableId == 0x42)
                         {
                             var sectionLength = ConvertToUint16(tsPayload.Skip(2).Take(2)) & 0xfff;
@@ -182,7 +171,7 @@ namespace N_m3u8DL_RE.DownloadManager
             await Task.Delay(1000);
             RecordingDurDic[0]++;
 
-                //检测时长限制
+            // 检测时长限制
             if (RecordingDurDic.All(d => d.Value >= DownloaderConfig.MyOptions.LiveRecordLimit?.TotalSeconds))
             {
                 Logger.WarnMarkUp($"[darkorange3_1]{ResString.liveLimitReached}[/]");
@@ -194,20 +183,20 @@ namespace N_m3u8DL_RE.DownloadManager
 
     public async Task<bool> StartRecordAsync()
     {
-            ConcurrentDictionary<int, SpeedContainer> SpeedContainerDic = new(); //速度计算
+        ConcurrentDictionary<int, SpeedContainer> SpeedContainerDic = new(); // 速度计算
         ConcurrentDictionary<StreamSpec, bool?> Results = new();
 
         var progress = CustomAnsiConsole.Console.Progress().AutoClear(true);
         progress.AutoRefresh = DownloaderConfig.MyOptions.LogLevel != LogLevel.OFF;
 
-            //进度条的列定义
+        // 进度条的列定义
         var progressColumns = new ProgressColumn[]
         {
             new TaskDescriptionColumn() { Alignment = Justify.Left },
-                new RecordingDurationColumn(RecordingDurDic), //时长显示
+            new RecordingDurationColumn(RecordingDurDic), // 时长显示
-                new RecordingSizeColumn(RecordingSizeDic), //大小显示
+            new RecordingSizeColumn(RecordingSizeDic), // 大小显示
             new RecordingStatusColumn(),
-                new DownloadSpeedColumn(SpeedContainerDic), //速度计算
+            new DownloadSpeedColumn(SpeedContainerDic), // 速度计算
             new SpinnerColumn(),
         };
         if (DownloaderConfig.MyOptions.NoAnsiColor)
@@ -218,26 +207,26 @@ namespace N_m3u8DL_RE.DownloadManager
 
         await progress.StartAsync(async ctx =>
         {
-                //创建任务
+            // 创建任务
             var dic = SelectedSteams.Select(item =>
             {
                 var task = ctx.AddTask(item.ToShortString(), autoStart: false, maxValue: 0);
-                    SpeedContainerDic[task.Id] = new SpeedContainer(); //速度计算
+                SpeedContainerDic[task.Id] = new SpeedContainer(); // 速度计算
                 RecordingDurDic[task.Id] = 0;
                 RecordingSizeDic[task.Id] = 0;
                 return (item, task);
             }).ToDictionary(item => item.item, item => item.task);
 
-                DownloaderConfig.MyOptions.LiveRecordLimit = DownloaderConfig.MyOptions.LiveRecordLimit ?? TimeSpan.MaxValue;
+            DownloaderConfig.MyOptions.LiveRecordLimit ??= TimeSpan.MaxValue;
             var limit = DownloaderConfig.MyOptions.LiveRecordLimit;
             if (limit != TimeSpan.MaxValue)
                 Logger.WarnMarkUp($"[darkorange3_1]{ResString.liveLimit}{GlobalUtil.FormatTime((int)limit.Value.TotalSeconds)}[/]");
-                //录制直播时，用户选了几个流就并发录几个
+            // 录制直播时，用户选了几个流就并发录几个
             var options = new ParallelOptions()
             {
                 MaxDegreeOfParallelism = SelectedSteams.Count
             };
-                //并发下载
+            // 并发下载
             await Parallel.ForEachAsync(dic, options, async (kp, _) =>
             {
                 var task = kp.Value;
@@ -250,5 +239,4 @@ namespace N_m3u8DL_RE.DownloadManager
 
         return success;
     }
-    }
 }

src/N_m3u8DL-RE/DownloadManager/SimpleDownloadManager.cs

@@ -13,16 +13,17 @@ using N_m3u8DL_RE.Util;
 using Spectre.Console;
 using System.Collections.Concurrent;
 using System.Text;
+using N_m3u8DL_RE.Enum;
 
-namespace N_m3u8DL_RE.DownloadManager
+namespace N_m3u8DL_RE.DownloadManager;
+
+internal class SimpleDownloadManager
 {
-    internal class SimpleDownloadManager
-    {
     IDownloader Downloader;
     DownloaderConfig DownloaderConfig;
     StreamExtractor StreamExtractor;
     List<StreamSpec> SelectedSteams;
-        List<OutputFile> OutputFiles = new();
+    List<OutputFile> OutputFiles = [];
 
     public SimpleDownloadManager(DownloaderConfig downloaderConfig, List<StreamSpec> selectedSteams, StreamExtractor streamExtractor) 
     { 
@@ -32,28 +33,28 @@ namespace N_m3u8DL_RE.DownloadManager
         Downloader = new SimpleDownloader(DownloaderConfig);
     }
 
-        //从文件读取KEY
+    // 从文件读取KEY
     private async Task SearchKeyAsync(string? currentKID)
     {
         var _key = await MP4DecryptUtil.SearchKeyFromFileAsync(DownloaderConfig.MyOptions.KeyTextFile, currentKID);
         if (_key != null)
         {
             if (DownloaderConfig.MyOptions.Keys == null)
-                    DownloaderConfig.MyOptions.Keys = new string[] { _key };
+                DownloaderConfig.MyOptions.Keys = [_key];
             else
-                    DownloaderConfig.MyOptions.Keys = DownloaderConfig.MyOptions.Keys.Concat(new string[] { _key }).ToArray();
+                DownloaderConfig.MyOptions.Keys = [..DownloaderConfig.MyOptions.Keys, _key];
         }
     }
 
     private void ChangeSpecInfo(StreamSpec streamSpec, List<Mediainfo> mediainfos, ref bool useAACFilter)
     {
-            if (!DownloaderConfig.MyOptions.BinaryMerge && mediainfos.Any(m => m.DolbyVison == true))
+        if (!DownloaderConfig.MyOptions.BinaryMerge && mediainfos.Any(m => m.DolbyVison))
         {
             DownloaderConfig.MyOptions.BinaryMerge = true;
             Logger.WarnMarkUp($"[darkorange3_1]{ResString.autoBinaryMerge2}[/]");
         }
 
-            if (DownloaderConfig.MyOptions.MuxAfterDone && mediainfos.Any(m => m.DolbyVison == true))
+        if (DownloaderConfig.MyOptions.MuxAfterDone && mediainfos.Any(m => m.DolbyVison))
         {
             DownloaderConfig.MyOptions.MuxAfterDone = false;
             Logger.WarnMarkUp($"[darkorange3_1]{ResString.autoBinaryMerge5}[/]");
@@ -71,7 +72,7 @@ namespace N_m3u8DL_RE.DownloadManager
         else if (mediainfos.All(m => m.Type == "Subtitle"))
         {
             streamSpec.MediaType = MediaType.SUBTITLES;
-                if (streamSpec.Extension == null || streamSpec.Extension == "ts")
+            if (streamSpec.Extension is null or "ts")
                 streamSpec.Extension = "vtt";
         }
     }
@@ -79,13 +80,13 @@ namespace N_m3u8DL_RE.DownloadManager
     private async Task<bool> DownloadStreamAsync(StreamSpec streamSpec, ProgressTask task, SpeedContainer speedContainer)
     {
         speedContainer.ResetVars();
-            bool useAACFilter = false; //ffmpeg合并flag
+        bool useAACFilter = false; // ffmpeg合并flag
-            List<Mediainfo> mediaInfos = new();
+        List<Mediainfo> mediaInfos = [];
         ConcurrentDictionary<MediaSegment, DownloadResult?> FileDic = new();
 
         var segments = streamSpec.Playlist?.MediaParts.SelectMany(m => m.MediaSegments);
         if (segments == null || !segments.Any()) return false;
-            //单分段尝试切片并行下载
+        // 单分段尝试切片并行下载
         if (segments.Count() == 1)
         {
             var splitSegments = await LargeSingleFileSplitUtil.SplitUrlAsync(segments.First(), DownloaderConfig.Headers);
@@ -109,19 +110,19 @@ namespace N_m3u8DL_RE.DownloadManager
         var saveName = DownloaderConfig.MyOptions.SaveName != null ? $"{DownloaderConfig.MyOptions.SaveName}.{streamSpec.Language}".TrimEnd('.') : dirName;
         var headers = DownloaderConfig.Headers;
 
-            //mp4decrypt
+        var decryptionBinaryPath = DownloaderConfig.MyOptions.DecryptionBinaryPath!;
-            var mp4decrypt = DownloaderConfig.MyOptions.DecryptionBinaryPath!;
+        var decryptEngine = DownloaderConfig.MyOptions.DecryptionEngine;
         var mp4InitFile = "";
         var currentKID = "";
-            var readInfo = false; //是否读取过
+        var readInfo = false; // 是否读取过
         var mp4Info = new ParsedMP4Info();
 
-            //用户自定义范围导致被跳过的时长 计算字幕偏移使用
+        // 用户自定义范围导致被跳过的时长 计算字幕偏移使用
         var skippedDur = streamSpec.SkippedDuration ?? 0d;
 
         Logger.Debug($"dirName: {dirName}; tmpDir: {tmpDir}; saveDir: {saveDir}; saveName: {saveName}");
 
-            //创建文件夹
+        // 创建文件夹
         if (!Directory.Exists(tmpDir)) Directory.CreateDirectory(tmpDir);
         if (!Directory.Exists(saveDir)) Directory.CreateDirectory(saveDir);
 
@@ -134,20 +135,20 @@ namespace N_m3u8DL_RE.DownloadManager
         task.MaxValue = totalCount;
         task.StartTask();
 
-            //开始下载
+        // 开始下载
         Logger.InfoMarkUp(ResString.startDownloading + streamSpec.ToShortString());
 
-            //对于CENC，全部自动开启二进制合并
+        // 对于CENC，全部自动开启二进制合并
         if (!DownloaderConfig.MyOptions.BinaryMerge && totalCount >= 1 && streamSpec.Playlist!.MediaParts.First().MediaSegments.First().EncryptInfo.Method == Common.Enum.EncryptMethod.CENC)
         {
             DownloaderConfig.MyOptions.BinaryMerge = true;
             Logger.WarnMarkUp($"[darkorange3_1]{ResString.autoBinaryMerge4}[/]");
         }
 
-            //下载init
+        // 下载init
         if (streamSpec.Playlist?.MediaInit != null)
         {
-                //对于fMP4，自动开启二进制合并
+            // 对于fMP4，自动开启二进制合并
             if (!DownloaderConfig.MyOptions.BinaryMerge && streamSpec.MediaType != MediaType.SUBTITLES)
             {
                 DownloaderConfig.MyOptions.BinaryMerge = true;
@@ -157,36 +158,36 @@ namespace N_m3u8DL_RE.DownloadManager
             var path = Path.Combine(tmpDir, "_init.mp4.tmp");
             var result = await Downloader.DownloadSegmentAsync(streamSpec.Playlist.MediaInit, path, speedContainer, headers);
             FileDic[streamSpec.Playlist.MediaInit] = result;
-                if (result == null || !result.Success)
+            if (result is not { Success: true })
             {
                 throw new Exception("Download init file failed!");
             }
             mp4InitFile = result.ActualFilePath;
             task.Increment(1);
 
-                //读取mp4信息
+            // 读取mp4信息
-                if (result != null && result.Success) 
+            if (result is { Success: true }) 
             {
                 mp4Info = MP4DecryptUtil.GetMP4Info(result.ActualFilePath);
                 currentKID = mp4Info.KID;
                 // try shaka packager, which can handle WebM
-                    if (string.IsNullOrEmpty(currentKID) &&  DownloaderConfig.MyOptions.UseShakaPackager) {
+                if (string.IsNullOrEmpty(currentKID) && DownloaderConfig.MyOptions.DecryptionEngine == DecryptEngine.SHAKA_PACKAGER) {
-                        currentKID = MP4DecryptUtil.ReadInitShaka(result.ActualFilePath, mp4decrypt);
+                    currentKID = MP4DecryptUtil.ReadInitShaka(result.ActualFilePath, decryptionBinaryPath);
                 }
-                    //从文件读取KEY
+                // 从文件读取KEY
                 await SearchKeyAsync(currentKID);
-                    //实时解密
+                // 实时解密
-                    if (DownloaderConfig.MyOptions.MP4RealTimeDecryption && !string.IsNullOrEmpty(currentKID) && StreamExtractor.ExtractorType != ExtractorType.MSS)
+                if ((streamSpec.Playlist.MediaInit.IsEncrypted || !string.IsNullOrEmpty(currentKID)) && DownloaderConfig.MyOptions.MP4RealTimeDecryption && !string.IsNullOrEmpty(currentKID) && StreamExtractor.ExtractorType != ExtractorType.MSS)
                 {
                     var enc = result.ActualFilePath;
                     var dec = Path.Combine(Path.GetDirectoryName(enc)!, Path.GetFileNameWithoutExtension(enc) + "_dec" + Path.GetExtension(enc));
-                        var dResult = await MP4DecryptUtil.DecryptAsync(DownloaderConfig.MyOptions.UseShakaPackager, mp4decrypt, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID, isMultiDRM: mp4Info.isMultiDRM);
+                    var dResult = await MP4DecryptUtil.DecryptAsync(decryptEngine, decryptionBinaryPath, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID, isMultiDRM: mp4Info.isMultiDRM);
                     if (dResult)
                     {
                         FileDic[streamSpec.Playlist.MediaInit]!.ActualFilePath = dec;
                     }
                 }
-                    //ffmpeg读取信息
+                // ffmpeg读取信息
                 if (!readInfo)
                 {
                     Logger.WarnMarkUp(ResString.readingInfo);
@@ -198,10 +199,10 @@ namespace N_m3u8DL_RE.DownloadManager
             }
         }
 
-            //计算填零个数
+        // 计算填零个数
         var pad = "0".PadLeft(segments.Count().ToString().Length, '0');
 
-            //下载第一个分片
+        // 下载第一个分片
         if (!readInfo || StreamExtractor.ExtractorType == ExtractorType.MSS)
         {
             var seg = segments.First();
@@ -211,49 +212,49 @@ namespace N_m3u8DL_RE.DownloadManager
             var path = Path.Combine(tmpDir, index.ToString(pad) + $".{streamSpec.Extension ?? "clip"}.tmp");
             var result = await Downloader.DownloadSegmentAsync(seg, path, speedContainer, headers);
             FileDic[seg] = result;
-                if (result == null || !result.Success)
+            if (result is not { Success: true })
             {
                 throw new Exception("Download first segment failed!");
             }
             task.Increment(1);
-                if (result != null && result.Success)
+            if (result is { Success: true })
             {
-                    //修复MSS init
+                // 修复MSS init
                 if (StreamExtractor.ExtractorType == ExtractorType.MSS)
                 {
                     var processor = new MSSMoovProcessor(streamSpec);
                     var header = processor.GenHeader(File.ReadAllBytes(result.ActualFilePath));
                     await File.WriteAllBytesAsync(FileDic[streamSpec.Playlist!.MediaInit!]!.ActualFilePath, header);
-                        if (DownloaderConfig.MyOptions.MP4RealTimeDecryption && !string.IsNullOrEmpty(currentKID))
+                    if (seg.IsEncrypted && DownloaderConfig.MyOptions.MP4RealTimeDecryption && !string.IsNullOrEmpty(currentKID))
                     {
-                            //需要重新解密init
+                        // 需要重新解密init
                         var enc = FileDic[streamSpec.Playlist!.MediaInit!]!.ActualFilePath;
                         var dec = Path.Combine(Path.GetDirectoryName(enc)!, Path.GetFileNameWithoutExtension(enc) + "_dec" + Path.GetExtension(enc));
-                            var dResult = await MP4DecryptUtil.DecryptAsync(DownloaderConfig.MyOptions.UseShakaPackager, mp4decrypt, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID);
+                        var dResult = await MP4DecryptUtil.DecryptAsync(decryptEngine, decryptionBinaryPath, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID);
                         if (dResult)
                         {
                             FileDic[streamSpec.Playlist!.MediaInit!]!.ActualFilePath = dec;
                         }
                     }
                 }
-                    //读取init信息
+                // 读取init信息
                 if (string.IsNullOrEmpty(currentKID))
                 {
                     currentKID = MP4DecryptUtil.GetMP4Info(result.ActualFilePath).KID;
                 }
                 // try shaka packager, which can handle WebM
-                    if (string.IsNullOrEmpty(currentKID) &&  DownloaderConfig.MyOptions.UseShakaPackager) {
+                if (string.IsNullOrEmpty(currentKID) &&  DownloaderConfig.MyOptions.DecryptionEngine == DecryptEngine.SHAKA_PACKAGER) {
-                        currentKID = MP4DecryptUtil.ReadInitShaka(result.ActualFilePath, mp4decrypt);
+                    currentKID = MP4DecryptUtil.ReadInitShaka(result.ActualFilePath, decryptionBinaryPath);
                 }
-                    //从文件读取KEY
+                // 从文件读取KEY
                 await SearchKeyAsync(currentKID);
-                    //实时解密
+                // 实时解密
-                    if (DownloaderConfig.MyOptions.MP4RealTimeDecryption && !string.IsNullOrEmpty(currentKID))
+                if (seg.IsEncrypted && DownloaderConfig.MyOptions.MP4RealTimeDecryption && !string.IsNullOrEmpty(currentKID))
                 {
                     var enc = result.ActualFilePath;
                     var dec = Path.Combine(Path.GetDirectoryName(enc)!, Path.GetFileNameWithoutExtension(enc) + "_dec" + Path.GetExtension(enc));
                     mp4Info = MP4DecryptUtil.GetMP4Info(enc);
-                        var dResult = await MP4DecryptUtil.DecryptAsync(DownloaderConfig.MyOptions.UseShakaPackager, mp4decrypt, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID, mp4InitFile, isMultiDRM: mp4Info.isMultiDRM);
+                    var dResult = await MP4DecryptUtil.DecryptAsync(decryptEngine, decryptionBinaryPath, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID, mp4InitFile, isMultiDRM: mp4Info.isMultiDRM);
                     if (dResult)
                     {
                         File.Delete(enc);
@@ -262,7 +263,7 @@ namespace N_m3u8DL_RE.DownloadManager
                 }
                 if (!readInfo)
                 {
-                        //ffmpeg读取信息
+                    // ffmpeg读取信息
                     Logger.WarnMarkUp(ResString.readingInfo);
                     mediaInfos = await MediainfoUtil.ReadInfoAsync(DownloaderConfig.MyOptions.FFmpegBinaryPath!, result!.ActualFilePath);
                     mediaInfos.ForEach(info => Logger.InfoMarkUp(info.ToStringMarkUp()));
@@ -272,7 +273,7 @@ namespace N_m3u8DL_RE.DownloadManager
             }
         }
 
-            //开始下载
+        // 开始下载
         var options = new ParallelOptions()
         {
             MaxDegreeOfParallelism = DownloaderConfig.MyOptions.ThreadCount
@@ -283,15 +284,15 @@ namespace N_m3u8DL_RE.DownloadManager
             var path = Path.Combine(tmpDir, index.ToString(pad) + $".{streamSpec.Extension ?? "clip"}.tmp");
             var result = await Downloader.DownloadSegmentAsync(seg, path, speedContainer, headers);
             FileDic[seg] = result;
-                if (result != null && result.Success)
+            if (result is { Success: true })
                 task.Increment(1);
-                //实时解密
+            // 实时解密
-                if (DownloaderConfig.MyOptions.MP4RealTimeDecryption && result != null && result.Success && !string.IsNullOrEmpty(currentKID)) 
+            if (seg.IsEncrypted && DownloaderConfig.MyOptions.MP4RealTimeDecryption && result is { Success: true } && !string.IsNullOrEmpty(currentKID)) 
             {
                 var enc = result.ActualFilePath;
                 var dec = Path.Combine(Path.GetDirectoryName(enc)!, Path.GetFileNameWithoutExtension(enc) + "_dec" + Path.GetExtension(enc));
                 mp4Info = MP4DecryptUtil.GetMP4Info(enc);
-                    var dResult = await MP4DecryptUtil.DecryptAsync(DownloaderConfig.MyOptions.UseShakaPackager, mp4decrypt, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID, mp4InitFile, isMultiDRM: mp4Info.isMultiDRM);
+                var dResult = await MP4DecryptUtil.DecryptAsync(decryptEngine, decryptionBinaryPath, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID, mp4InitFile, isMultiDRM: mp4Info.isMultiDRM);
                 if (dResult)
                 {
                     File.Delete(enc);
@@ -300,61 +301,59 @@ namespace N_m3u8DL_RE.DownloadManager
             }
         });
 
-            //修改输出后缀
+        // 修改输出后缀
         var outputExt = "." + streamSpec.Extension;
         if (streamSpec.Extension == null) outputExt = ".ts";
-            else if (streamSpec.MediaType == MediaType.AUDIO && (streamSpec.Extension == "m4s" || streamSpec.Extension == "mp4")) outputExt = ".m4a";
+        else if (streamSpec is { MediaType: MediaType.AUDIO, Extension: "m4s" or "mp4" }) outputExt = ".m4a";
-            else if (streamSpec.MediaType != MediaType.SUBTITLES && (streamSpec.Extension == "m4s" || streamSpec.Extension == "mp4")) outputExt = ".mp4";
+        else if (streamSpec.MediaType != MediaType.SUBTITLES && streamSpec.Extension is "m4s" or "mp4") outputExt = ".mp4";
 
         if (DownloaderConfig.MyOptions.AutoSubtitleFix && streamSpec.MediaType == MediaType.SUBTITLES)
         {
-                if (DownloaderConfig.MyOptions.SubtitleFormat == Enum.SubtitleFormat.SRT) outputExt = ".srt";
+            outputExt = DownloaderConfig.MyOptions.SubtitleFormat == Enum.SubtitleFormat.SRT ? ".srt" : ".vtt";
-                else outputExt = ".vtt";
         }
         var output = Path.Combine(saveDir, saveName + outputExt);
 
-            //检测目标文件是否存在
+        // 检测目标文件是否存在
         while (File.Exists(output))
         {
             Logger.WarnMarkUp($"{Path.GetFileName(output)} => {Path.GetFileName(output = Path.ChangeExtension(output, $"copy" + Path.GetExtension(output)))}");
         }
 
-            if (!string.IsNullOrEmpty(currentKID) && DownloaderConfig.MyOptions.MP4RealTimeDecryption && DownloaderConfig.MyOptions.Keys != null && DownloaderConfig.MyOptions.Keys.Length > 0 && mp4InitFile != "")
+        if (!string.IsNullOrEmpty(currentKID) && DownloaderConfig.MyOptions is { MP4RealTimeDecryption: true, Keys.Length: > 0 } && mp4InitFile != "")
         {
             File.Delete(mp4InitFile);
-                //shaka实时解密不需要init文件用于合并
+            // shaka/ffmpeg实时解密不需要init文件用于合并
-                if (DownloaderConfig.MyOptions.UseShakaPackager)
+            if (decryptEngine != DecryptEngine.MP4DECRYPT)
             {
                 FileDic!.Remove(streamSpec.Playlist!.MediaInit, out _);
             }
         }
 
-            //校验分片数量
+        // 校验分片数量
         if (DownloaderConfig.MyOptions.CheckSegmentsCount && FileDic.Values.Any(s => s == null))
         {
-                Logger.ErrorMarkUp(ResString.segmentCountCheckNotPass, totalCount, FileDic.Values.Where(s => s != null).Count());
+            Logger.ErrorMarkUp(ResString.segmentCountCheckNotPass, totalCount, FileDic.Values.Count(s => s != null));
             return false;
         }
 
-            //移除无效片段
+        // 移除无效片段
         var badKeys = FileDic.Where(i => i.Value == null).Select(i => i.Key);
         foreach (var badKey in badKeys)
         {
             FileDic!.Remove(badKey, out _);
         }
 
-            //校验完整性
+        // 校验完整性
         if (DownloaderConfig.CheckContentLength && FileDic.Values.Any(a => a!.Success == false)) 
         {
             return false;
         }
 
-            //自动修复VTT raw字幕
+        // 自动修复VTT raw字幕
-            if (DownloaderConfig.MyOptions.AutoSubtitleFix && streamSpec.MediaType == Common.Enum.MediaType.SUBTITLES 
+        if (DownloaderConfig.MyOptions.AutoSubtitleFix && streamSpec is { MediaType: Common.Enum.MediaType.SUBTITLES, Extension: not null } && streamSpec.Extension.Contains("vtt")) 
-                && streamSpec.Extension != null && streamSpec.Extension.Contains("vtt")) 
         {
             Logger.WarnMarkUp(ResString.fixingVTT);
-                //排序字幕并修正时间戳
+            // 排序字幕并修正时间戳
             bool first = true;
             var finalVtt = new WebVttSub();
             var keys = FileDic.Keys.OrderBy(k => k.Index);
@@ -362,7 +361,7 @@ namespace N_m3u8DL_RE.DownloadManager
             {
                 var vttContent = File.ReadAllText(FileDic[seg]!.ActualFilePath);
                 var vtt = WebVttSub.Parse(vttContent);
-                    //手动计算MPEGTS
+                // 手动计算MPEGTS
                 if (finalVtt.MpegtsTimestamp == 0 && vtt.MpegtsTimestamp == 0)
                 {
                     vtt.MpegtsTimestamp = 90000 * (long)(skippedDur + keys.Where(s => s.Index < seg.Index).Sum(s => s.Duration));
@@ -370,16 +369,16 @@ namespace N_m3u8DL_RE.DownloadManager
                 if (first) { finalVtt = vtt; first = false; }
                 else finalVtt.AddCuesFromOne(vtt);
             }
-                //写出字幕
+            // 写出字幕
             var files = FileDic.OrderBy(s => s.Key.Index).Select(s => s.Value).Select(v => v!.ActualFilePath).ToArray();
             foreach (var item in files) File.Delete(item);
             FileDic.Clear();
             var index = 0;
             var path = Path.Combine(tmpDir, index.ToString(pad) + ".fix.vtt");
-                //设置字幕偏移
+            // 设置字幕偏移
             finalVtt.LeftShiftTime(TimeSpan.FromSeconds(skippedDur));
             var subContentFixed = finalVtt.ToVtt();
-                //转换字幕格式
+            // 转换字幕格式
             if (DownloaderConfig.MyOptions.SubtitleFormat != Enum.SubtitleFormat.VTT)
             {
                 path = Path.ChangeExtension(path, ".srt");
@@ -393,11 +392,11 @@ namespace N_m3u8DL_RE.DownloadManager
             };
         }
 
-            //自动修复VTT mp4字幕
+        // 自动修复VTT mp4字幕
         if (DownloaderConfig.MyOptions.AutoSubtitleFix && streamSpec.MediaType == Common.Enum.MediaType.SUBTITLES
                                                        && streamSpec.Codecs != "stpp" && streamSpec.Extension != null && streamSpec.Extension.Contains("m4s"))
         {
-                var initFile = FileDic.Values.Where(v => Path.GetFileName(v!.ActualFilePath).StartsWith("_init")).FirstOrDefault();
+            var initFile = FileDic.Values.FirstOrDefault(v => Path.GetFileName(v!.ActualFilePath).StartsWith("_init"));
             var iniFileBytes = File.ReadAllBytes(initFile!.ActualFilePath);
             var (sawVtt, timescale) = MP4VttUtil.CheckInit(iniFileBytes);
             if (sawVtt)
@@ -405,17 +404,17 @@ namespace N_m3u8DL_RE.DownloadManager
                 Logger.WarnMarkUp(ResString.fixingVTTmp4);
                 var mp4s = FileDic.OrderBy(s => s.Key.Index).Select(s => s.Value).Select(v => v!.ActualFilePath).Where(p => p.EndsWith(".m4s")).ToArray();
                 var finalVtt = MP4VttUtil.ExtractSub(mp4s, timescale);
-                    //写出字幕
+                // 写出字幕
                 var firstKey = FileDic.Keys.First();
                 var files = FileDic.OrderBy(s => s.Key.Index).Select(s => s.Value).Select(v => v!.ActualFilePath).ToArray();
                 foreach (var item in files) File.Delete(item);
                 FileDic.Clear();
                 var index = 0;
                 var path = Path.Combine(tmpDir, index.ToString(pad) + ".fix.vtt");
-                    //设置字幕偏移
+                // 设置字幕偏移
                 finalVtt.LeftShiftTime(TimeSpan.FromSeconds(skippedDur));
                 var subContentFixed = finalVtt.ToVtt();
-                    //转换字幕格式
+                // 转换字幕格式
                 if (DownloaderConfig.MyOptions.SubtitleFormat != Enum.SubtitleFormat.VTT)
                 {
                     path = Path.ChangeExtension(path, ".srt");
@@ -430,9 +429,8 @@ namespace N_m3u8DL_RE.DownloadManager
             }
         }
 
-            //自动修复TTML raw字幕
+        // 自动修复TTML raw字幕
-            if (DownloaderConfig.MyOptions.AutoSubtitleFix && streamSpec.MediaType == Common.Enum.MediaType.SUBTITLES
+        if (DownloaderConfig.MyOptions.AutoSubtitleFix && streamSpec is { MediaType: Common.Enum.MediaType.SUBTITLES, Extension: not null } && streamSpec.Extension.Contains("ttml"))
-                && streamSpec.Extension != null && streamSpec.Extension.Contains("ttml"))
         {
             Logger.WarnMarkUp(ResString.fixingTTML);
             var first = true;
@@ -441,7 +439,7 @@ namespace N_m3u8DL_RE.DownloadManager
             foreach (var seg in keys)
             {
                 var vtt = MP4TtmlUtil.ExtractFromTTML(FileDic[seg]!.ActualFilePath, 0);
-                    //手动计算MPEGTS
+                // 手动计算MPEGTS
                 if (finalVtt.MpegtsTimestamp == 0 && vtt.MpegtsTimestamp == 0)
                 {
                     vtt.MpegtsTimestamp = 90000 * (long)(skippedDur + keys.Where(s => s.Index < seg.Index).Sum(s => s.Duration));
@@ -449,21 +447,21 @@ namespace N_m3u8DL_RE.DownloadManager
                 if (first) { finalVtt = vtt; first = false; }
                 else finalVtt.AddCuesFromOne(vtt);
             }
-                //写出字幕
+            // 写出字幕
             var firstKey = FileDic.Keys.First();
             var files = FileDic.OrderBy(s => s.Key.Index).Select(s => s.Value).Select(v => v!.ActualFilePath).ToArray();
 
-                //处理图形字幕
+            // 处理图形字幕
             await SubtitleUtil.TryWriteImagePngsAsync(finalVtt, tmpDir);
 
             foreach (var item in files) File.Delete(item);
             FileDic.Clear();
             var index = 0;
             var path = Path.Combine(tmpDir, index.ToString(pad) + ".fix.vtt");
-                //设置字幕偏移
+            // 设置字幕偏移
             finalVtt.LeftShiftTime(TimeSpan.FromSeconds(skippedDur));
             var subContentFixed = finalVtt.ToVtt();
-                //转换字幕格式
+            // 转换字幕格式
             if (DownloaderConfig.MyOptions.SubtitleFormat != Enum.SubtitleFormat.VTT)
             {
                 path = Path.ChangeExtension(path, ".srt");
@@ -477,23 +475,22 @@ namespace N_m3u8DL_RE.DownloadManager
             };
         }
 
-            //自动修复TTML mp4字幕
+        // 自动修复TTML mp4字幕
-            if (DownloaderConfig.MyOptions.AutoSubtitleFix && streamSpec.MediaType == Common.Enum.MediaType.SUBTITLES
+        if (DownloaderConfig.MyOptions.AutoSubtitleFix && streamSpec is { MediaType: Common.Enum.MediaType.SUBTITLES, Extension: not null } && streamSpec.Extension.Contains("m4s")
-                && streamSpec.Extension != null && streamSpec.Extension.Contains("m4s")
             && streamSpec.Codecs != null && streamSpec.Codecs.Contains("stpp")) 
         {
             Logger.WarnMarkUp(ResString.fixingTTMLmp4);
-                //sawTtml暂时不判断
+            // sawTtml暂时不判断
-                //var initFile = FileDic.Values.Where(v => Path.GetFileName(v!.ActualFilePath).StartsWith("_init")).FirstOrDefault();
+            // var initFile = FileDic.Values.Where(v => Path.GetFileName(v!.ActualFilePath).StartsWith("_init")).FirstOrDefault();
-                //var iniFileBytes = File.ReadAllBytes(initFile!.ActualFilePath);
+            // var iniFileBytes = File.ReadAllBytes(initFile!.ActualFilePath);
-                //var sawTtml = MP4TtmlUtil.CheckInit(iniFileBytes);
+            // var sawTtml = MP4TtmlUtil.CheckInit(iniFileBytes);
             var first = true;
             var finalVtt = new WebVttSub();
             var keys = FileDic.OrderBy(s => s.Key.Index).Where(v => v.Value!.ActualFilePath.EndsWith(".m4s")).Select(s => s.Key);
             foreach (var seg in keys)
             {
                 var vtt = MP4TtmlUtil.ExtractFromMp4(FileDic[seg]!.ActualFilePath, 0);
-                    //手动计算MPEGTS
+                // 手动计算MPEGTS
                 if (finalVtt.MpegtsTimestamp == 0 && vtt.MpegtsTimestamp == 0)
                 {
                     vtt.MpegtsTimestamp = 90000 * (long)(skippedDur + keys.Where(s => s.Index < seg.Index).Sum(s => s.Duration));
@@ -502,21 +499,21 @@ namespace N_m3u8DL_RE.DownloadManager
                 else finalVtt.AddCuesFromOne(vtt);
             }
 
-                //写出字幕
+            // 写出字幕
             var firstKey = FileDic.Keys.First();
             var files = FileDic.OrderBy(s => s.Key.Index).Select(s => s.Value).Select(v => v!.ActualFilePath).ToArray();
 
-                //处理图形字幕
+            // 处理图形字幕
             await SubtitleUtil.TryWriteImagePngsAsync(finalVtt, tmpDir);
 
             foreach (var item in files) File.Delete(item);
             FileDic.Clear();
             var index = 0;
             var path = Path.Combine(tmpDir, index.ToString(pad) + ".fix.vtt");
-                //设置字幕偏移
+            // 设置字幕偏移
             finalVtt.LeftShiftTime(TimeSpan.FromSeconds(skippedDur));
             var subContentFixed = finalVtt.ToVtt();
-                //转换字幕格式
+            // 转换字幕格式
             if (DownloaderConfig.MyOptions.SubtitleFormat != Enum.SubtitleFormat.VTT)
             {
                 path = Path.ChangeExtension(path, ".srt");
@@ -531,10 +528,10 @@ namespace N_m3u8DL_RE.DownloadManager
         }
 
         bool mergeSuccess = false;
-            //合并
+        // 合并
         if (!DownloaderConfig.MyOptions.SkipMerge)
         {
-                //字幕也使用二进制合并
+            // 字幕也使用二进制合并
             if (DownloaderConfig.MyOptions.BinaryMerge || streamSpec.MediaType == MediaType.SUBTITLES)
             {
                 Logger.InfoMarkUp(ResString.binaryMerge);
@@ -544,17 +541,17 @@ namespace N_m3u8DL_RE.DownloadManager
             }
             else
             {
-                    //ffmpeg合并
+                // ffmpeg合并
                 var files = FileDic.OrderBy(s => s.Key.Index).Select(s => s.Value).Select(v => v!.ActualFilePath).ToArray();
                 Logger.InfoMarkUp(ResString.ffmpegMerge);
                 var ext = streamSpec.MediaType == MediaType.AUDIO ? "m4a" : "mp4";
                 var ffOut = Path.Combine(Path.GetDirectoryName(output)!, Path.GetFileNameWithoutExtension(output) + $".{ext}");
-                    //检测目标文件是否存在
+                // 检测目标文件是否存在
                 while (File.Exists(ffOut))
                 {
                     Logger.WarnMarkUp($"{Path.GetFileName(ffOut)} => {Path.GetFileName(ffOut = Path.ChangeExtension(ffOut, $"copy" + Path.GetExtension(ffOut)))}");
                 }
-                    //大于1800分片，需要分步骤合并
+                // 大于1800分片，需要分步骤合并
                 if (files.Length >= 1800)
                 {
                     Logger.WarnMarkUp(ResString.partMerge);
@@ -573,8 +570,8 @@ namespace N_m3u8DL_RE.DownloadManager
             }
         }
 
-            //删除临时文件夹
+        // 删除临时文件夹
-            if (!DownloaderConfig.MyOptions.SkipMerge && DownloaderConfig.MyOptions.DelAfterDone && mergeSuccess)
+        if (DownloaderConfig.MyOptions is { SkipMerge: false, DelAfterDone: true } && mergeSuccess)
         {
             var files = FileDic.Values.Select(v => v!.ActualFilePath);
             foreach (var file in files)
@@ -584,26 +581,26 @@ namespace N_m3u8DL_RE.DownloadManager
             OtherUtil.SafeDeleteDir(tmpDir);
         }
 
-            //重新读取init信息
+        // 重新读取init信息
         if (mergeSuccess && totalCount >= 1 && string.IsNullOrEmpty(currentKID) && streamSpec.Playlist!.MediaParts.First().MediaSegments.First().EncryptInfo.Method != Common.Enum.EncryptMethod.NONE)
         {
             currentKID = MP4DecryptUtil.GetMP4Info(output).KID;
             // try shaka packager, which can handle WebM
-                if (string.IsNullOrEmpty(currentKID) &&  DownloaderConfig.MyOptions.UseShakaPackager) {
+            if (string.IsNullOrEmpty(currentKID) &&  DownloaderConfig.MyOptions.DecryptionEngine == DecryptEngine.SHAKA_PACKAGER) {
-                    currentKID = MP4DecryptUtil.ReadInitShaka(output, mp4decrypt);
+                currentKID = MP4DecryptUtil.ReadInitShaka(output, decryptionBinaryPath);
             }
-                //从文件读取KEY
+            // 从文件读取KEY
             await SearchKeyAsync(currentKID);
         }
 
-            //调用mp4decrypt解密
+        // 调用mp4decrypt解密
-             if (mergeSuccess && File.Exists(output) && !string.IsNullOrEmpty(currentKID) && !DownloaderConfig.MyOptions.MP4RealTimeDecryption && DownloaderConfig.MyOptions.Keys != null && DownloaderConfig.MyOptions.Keys.Length > 0)
+        if (mergeSuccess && File.Exists(output) && !string.IsNullOrEmpty(currentKID) && DownloaderConfig.MyOptions is { MP4RealTimeDecryption: false, Keys.Length: > 0 })
         {
             var enc = output;
             var dec = Path.Combine(Path.GetDirectoryName(enc)!, Path.GetFileNameWithoutExtension(enc) + "_dec" + Path.GetExtension(enc));
             mp4Info = MP4DecryptUtil.GetMP4Info(enc);
-                Logger.InfoMarkUp($"[grey]Decrypting...[/]");
+            Logger.InfoMarkUp($"[grey]Decrypting using {decryptEngine}...[/]");
-                var result = await MP4DecryptUtil.DecryptAsync(DownloaderConfig.MyOptions.UseShakaPackager, mp4decrypt, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID, isMultiDRM: mp4Info.isMultiDRM);
+            var result = await MP4DecryptUtil.DecryptAsync(decryptEngine, decryptionBinaryPath, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID, isMultiDRM: mp4Info.isMultiDRM);
             if (result)
             {
                 File.Delete(enc);
@@ -611,7 +608,7 @@ namespace N_m3u8DL_RE.DownloadManager
             }
         }
 
-            //记录所有文件信息
+        // 记录所有文件信息
         if (File.Exists(output))
         {
             OutputFiles.Add(new OutputFile()
@@ -630,20 +627,20 @@ namespace N_m3u8DL_RE.DownloadManager
 
     public async Task<bool> StartDownloadAsync()
     {
-            ConcurrentDictionary<int, SpeedContainer> SpeedContainerDic = new(); //速度计算
+        ConcurrentDictionary<int, SpeedContainer> SpeedContainerDic = new(); // 速度计算
         ConcurrentDictionary<StreamSpec, bool?> Results = new();
             
         var progress = CustomAnsiConsole.Console.Progress().AutoClear(true);
         progress.AutoRefresh = DownloaderConfig.MyOptions.LogLevel != LogLevel.OFF;
 
-            //进度条的列定义
+        // 进度条的列定义
         var progressColumns = new ProgressColumn[]
         {
             new TaskDescriptionColumn() { Alignment = Justify.Left },
             new ProgressBarColumn(){ Width = 30 },
             new MyPercentageColumn(),
             new DownloadStatusColumn(SpeedContainerDic),
-                new DownloadSpeedColumn(SpeedContainerDic), //速度计算
+            new DownloadSpeedColumn(SpeedContainerDic), // 速度计算
             new RemainingTimeColumn(),
             new SpinnerColumn(),
         };
@@ -653,19 +650,18 @@ namespace N_m3u8DL_RE.DownloadManager
         }
         progress.Columns(progressColumns);
 
-            if (DownloaderConfig.MyOptions.MP4RealTimeDecryption && !DownloaderConfig.MyOptions.UseShakaPackager
+        if (DownloaderConfig.MyOptions is { MP4RealTimeDecryption: true, DecryptionEngine: not DecryptEngine.SHAKA_PACKAGER, Keys.Length: > 0 })
-                && DownloaderConfig.MyOptions.Keys != null && DownloaderConfig.MyOptions.Keys.Length > 0)
             Logger.WarnMarkUp($"[darkorange3_1]{ResString.realTimeDecMessage}[/]");
 
         await progress.StartAsync(async ctx =>
         {
-                //创建任务
+            // 创建任务
             var dic = SelectedSteams.Select(item =>
             {
                 var description = item.ToShortShortString();
                 var task = ctx.AddTask(description, autoStart: false);
-                    SpeedContainerDic[task.Id] = new SpeedContainer(); //速度计算
+                SpeedContainerDic[task.Id] = new SpeedContainer(); // 速度计算
-                    //限速设置
+                // 限速设置
                 if (DownloaderConfig.MyOptions.MaxSpeed != null)
                 {
                     SpeedContainerDic[task.Id].SpeedLimit = DownloaderConfig.MyOptions.MaxSpeed.Value;
@@ -675,19 +671,19 @@ namespace N_m3u8DL_RE.DownloadManager
 
             if (!DownloaderConfig.MyOptions.ConcurrentDownload)
             {
-                    //遍历，顺序下载
+                // 遍历，顺序下载
                 foreach (var kp in dic)
                 {
                     var task = kp.Value;
                     var result = await DownloadStreamAsync(kp.Key, task, SpeedContainerDic[task.Id]);
                     Results[kp.Key] = result;
-                        //失败不再下载后续
+                    // 失败不再下载后续
                     if (!result) break;
                 }
             }
             else
             {
-                    //并发下载
+                // 并发下载
                 await Parallel.ForEachAsync(dic, async (kp, _) =>
                 {
                     var task = kp.Value;
@@ -699,8 +695,8 @@ namespace N_m3u8DL_RE.DownloadManager
 
         var success = Results.Values.All(v => v == true);
 
-            //删除临时文件夹
+        // 删除临时文件夹
-            if (!DownloaderConfig.MyOptions.SkipMerge && DownloaderConfig.MyOptions.DelAfterDone && success)
+        if (DownloaderConfig.MyOptions is { SkipMerge: false, DelAfterDone: true } && success)
         {
             foreach (var item in StreamExtractor.RawFiles)
             {
@@ -710,12 +706,12 @@ namespace N_m3u8DL_RE.DownloadManager
             OtherUtil.SafeDeleteDir(DownloaderConfig.DirPrefix);
         }
 
-            //混流
+        // 混流
         if (success && DownloaderConfig.MyOptions.MuxAfterDone && OutputFiles.Count > 0) 
         {
             OutputFiles = OutputFiles.OrderBy(o => o.Index).ToList();
-                //是否跳过字幕
+            // 是否跳过字幕
-                if (DownloaderConfig.MyOptions.MuxOptions.SkipSubtitle)
+            if (DownloaderConfig.MyOptions.MuxOptions!.SkipSubtitle)
             {
                 OutputFiles = OutputFiles.Where(o => o.MediaType != MediaType.SUBTITLES).ToList();
             }
@@ -725,15 +721,15 @@ namespace N_m3u8DL_RE.DownloadManager
             }
             OutputFiles.ForEach(f => Logger.WarnMarkUp($"[grey]{Path.GetFileName(f.FilePath).EscapeMarkup()}[/]"));
             var saveDir = DownloaderConfig.MyOptions.SaveDir ?? Environment.CurrentDirectory;
-                var ext = DownloaderConfig.MyOptions.MuxOptions.MuxToMp4 ? ".mp4" : ".mkv";
+            var ext = OtherUtil.GetMuxExtension(DownloaderConfig.MyOptions.MuxOptions.MuxFormat);
             var dirName = Path.GetFileName(DownloaderConfig.DirPrefix);
             var outName = $"{dirName}.MUX";
             var outPath = Path.Combine(saveDir, outName);
             Logger.WarnMarkUp($"Muxing to [grey]{outName.EscapeMarkup()}{ext}[/]");
             var result = false;
             if (DownloaderConfig.MyOptions.MuxOptions.UseMkvmerge) result = MergeUtil.MuxInputsByMkvmerge(DownloaderConfig.MyOptions.MkvmergeBinaryPath!, OutputFiles.ToArray(), outPath);
-                else result = MergeUtil.MuxInputsByFFmpeg(DownloaderConfig.MyOptions.FFmpegBinaryPath!, OutputFiles.ToArray(), outPath, DownloaderConfig.MyOptions.MuxOptions.MuxToMp4, !DownloaderConfig.MyOptions.NoDateInfo);
+            else result = MergeUtil.MuxInputsByFFmpeg(DownloaderConfig.MyOptions.FFmpegBinaryPath!, OutputFiles.ToArray(), outPath, DownloaderConfig.MyOptions.MuxOptions.MuxFormat, !DownloaderConfig.MyOptions.NoDateInfo);
-                //完成后删除各轨道文件
+            // 完成后删除各轨道文件
             if (result)
             {
                 if (!DownloaderConfig.MyOptions.MuxOptions.KeepFiles)
@@ -749,7 +745,7 @@ namespace N_m3u8DL_RE.DownloadManager
                 success = false;
                 Logger.ErrorMarkUp($"Mux failed");
             }
-                //判断是否要改名
+            // 判断是否要改名
             var newPath = Path.ChangeExtension(outPath, ext);
             if (result && !File.Exists(newPath))
             {
@@ -760,5 +756,4 @@ namespace N_m3u8DL_RE.DownloadManager
 
         return success;
     }
-    }
 }

src/N_m3u8DL-RE/DownloadManager/SimpleLiveRecordManager2.cs

@@ -12,41 +12,36 @@ using N_m3u8DL_RE.Parser;
 using N_m3u8DL_RE.Parser.Mp4;
 using N_m3u8DL_RE.Util;
 using Spectre.Console;
-using Spectre.Console.Rendering;
 using System.Collections.Concurrent;
-using System.Diagnostics;
-using System.IO;
 using System.IO.Pipes;
-using System.Linq;
 using System.Text;
-using System.Threading.Tasks;
 using System.Threading.Tasks.Dataflow;
-using System.Xml.Linq;
+using N_m3u8DL_RE.Enum;
 
-namespace N_m3u8DL_RE.DownloadManager
+namespace N_m3u8DL_RE.DownloadManager;
+
+internal class SimpleLiveRecordManager2
 {
-    internal class SimpleLiveRecordManager2
-    {
     IDownloader Downloader;
     DownloaderConfig DownloaderConfig;
     StreamExtractor StreamExtractor;
     List<StreamSpec> SelectedSteams;
     ConcurrentDictionary<int, string> PipeSteamNamesDic = new();
-        List<OutputFile> OutputFiles = new();
+    List<OutputFile> OutputFiles = [];
     DateTime? PublishDateTime;
     bool STOP_FLAG = false;
-        int WAIT_SEC = 0; //刷新间隔
+    int WAIT_SEC = 0; // 刷新间隔
-        ConcurrentDictionary<int, int> RecordedDurDic = new(); //已录制时长
+    ConcurrentDictionary<int, int> RecordedDurDic = new(); // 已录制时长
-        ConcurrentDictionary<int, int> RefreshedDurDic = new(); //已刷新出的时长
+    ConcurrentDictionary<int, int> RefreshedDurDic = new(); // 已刷新出的时长
-        ConcurrentDictionary<int, BufferBlock<List<MediaSegment>>> BlockDic = new(); //各流的Block
+    ConcurrentDictionary<int, BufferBlock<List<MediaSegment>>> BlockDic = new(); // 各流的Block
-        ConcurrentDictionary<int, bool> SamePathDic = new(); //各流是否allSamePath
+    ConcurrentDictionary<int, bool> SamePathDic = new(); // 各流是否allSamePath
-        ConcurrentDictionary<int, bool> RecordLimitReachedDic = new(); //各流是否达到上限
+    ConcurrentDictionary<int, bool> RecordLimitReachedDic = new(); // 各流是否达到上限
-        ConcurrentDictionary<int, string> LastFileNameDic = new(); //上次下载的文件名
+    ConcurrentDictionary<int, string> LastFileNameDic = new(); // 上次下载的文件名
-        ConcurrentDictionary<int, long> MaxIndexDic = new(); //最大Index
+    ConcurrentDictionary<int, long> MaxIndexDic = new(); // 最大Index
-        ConcurrentDictionary<int, long> DateTimeDic = new(); //上次下载的dateTime
+    ConcurrentDictionary<int, long> DateTimeDic = new(); // 上次下载的dateTime
-        CancellationTokenSource CancellationTokenSource = new(); //取消Wait
+    CancellationTokenSource CancellationTokenSource = new(); // 取消Wait
 
-        private readonly object lockObj = new object();
+    private readonly Lock lockObj = new();
     TimeSpan? audioStart = null;
 
     public SimpleLiveRecordManager2(DownloaderConfig downloaderConfig, List<StreamSpec> selectedSteams, StreamExtractor streamExtractor)
@@ -58,16 +53,16 @@ namespace N_m3u8DL_RE.DownloadManager
         SelectedSteams = selectedSteams;
     }
 
-        //从文件读取KEY
+    // 从文件读取KEY
     private async Task SearchKeyAsync(string? currentKID)
     {
         var _key = await MP4DecryptUtil.SearchKeyFromFileAsync(DownloaderConfig.MyOptions.KeyTextFile, currentKID);
         if (_key != null)
         {
             if (DownloaderConfig.MyOptions.Keys == null)
-                    DownloaderConfig.MyOptions.Keys = new string[] { _key };
+                DownloaderConfig.MyOptions.Keys = [_key];
             else
-                    DownloaderConfig.MyOptions.Keys = DownloaderConfig.MyOptions.Keys.Concat(new string[] { _key }).ToArray();
+                DownloaderConfig.MyOptions.Keys = [..DownloaderConfig.MyOptions.Keys, _key];
         }
     }
 
@@ -116,13 +111,13 @@ namespace N_m3u8DL_RE.DownloadManager
 
     private void ChangeSpecInfo(StreamSpec streamSpec, List<Mediainfo> mediainfos, ref bool useAACFilter)
     {
-            if (!DownloaderConfig.MyOptions.BinaryMerge && mediainfos.Any(m => m.DolbyVison == true))
+        if (!DownloaderConfig.MyOptions.BinaryMerge && mediainfos.Any(m => m.DolbyVison))
         {
             DownloaderConfig.MyOptions.BinaryMerge = true;
             Logger.WarnMarkUp($"[darkorange3_1]{ResString.autoBinaryMerge2}[/]");
         }
 
-            if (DownloaderConfig.MyOptions.MuxAfterDone && mediainfos.Any(m => m.DolbyVison == true))
+        if (DownloaderConfig.MyOptions.MuxAfterDone && mediainfos.Any(m => m.DolbyVison))
         {
             DownloaderConfig.MyOptions.MuxAfterDone = false;
             Logger.WarnMarkUp($"[darkorange3_1]{ResString.autoBinaryMerge5}[/]");
@@ -141,7 +136,7 @@ namespace N_m3u8DL_RE.DownloadManager
         {
             streamSpec.MediaType = MediaType.SUBTITLES;
 
-                if (streamSpec.Extension == null || streamSpec.Extension == "ts")
+            if (streamSpec.Extension is null or "ts")
                 streamSpec.Extension = "vtt";
         }
     }
@@ -149,17 +144,16 @@ namespace N_m3u8DL_RE.DownloadManager
     private async Task<bool> RecordStreamAsync(StreamSpec streamSpec, ProgressTask task, SpeedContainer speedContainer, BufferBlock<List<MediaSegment>> source)
     {
         var baseTimestamp = PublishDateTime == null ? 0L : (long)(PublishDateTime.Value.ToUniversalTime() - new DateTime(1970, 1, 1, 0, 0, 0, 0)).TotalMilliseconds;
-            //mp4decrypt
+        var decryptionBinaryPath = DownloaderConfig.MyOptions.DecryptionBinaryPath!;
-            var mp4decrypt = DownloaderConfig.MyOptions.DecryptionBinaryPath!;
         var mp4InitFile = "";
         var currentKID = "";
-            var readInfo = false; //是否读取过
+        var readInfo = false; // 是否读取过
-            bool useAACFilter = false; //ffmpeg合并flag
+        bool useAACFilter = false; // ffmpeg合并flag
-            bool initDownloaded = false; //是否下载过init文件
+        bool initDownloaded = false; // 是否下载过init文件
         ConcurrentDictionary<MediaSegment, DownloadResult?> FileDic = new();
-            List<Mediainfo> mediaInfos = new();
+        List<Mediainfo> mediaInfos = [];
         Stream? fileOutputStream = null;
-            WebVttSub currentVtt = new(); //字幕流始终维护一个实例
+        WebVttSub currentVtt = new(); // 字幕流始终维护一个实例
         bool firstSub = true;
         task.StartTask();
 
@@ -170,29 +164,30 @@ namespace N_m3u8DL_RE.DownloadManager
         var saveDir = DownloaderConfig.MyOptions.SaveDir ?? Environment.CurrentDirectory;
         var saveName = DownloaderConfig.MyOptions.SaveName != null ? $"{DownloaderConfig.MyOptions.SaveName}.{streamSpec.Language}".TrimEnd('.') : dirName;
         var headers = DownloaderConfig.Headers;
+        var decryptEngine = DownloaderConfig.MyOptions.DecryptionEngine;
 
         Logger.Debug($"dirName: {dirName}; tmpDir: {tmpDir}; saveDir: {saveDir}; saveName: {saveName}");
 
-            //创建文件夹
+        // 创建文件夹
         if (!Directory.Exists(tmpDir)) Directory.CreateDirectory(tmpDir);
         if (!Directory.Exists(saveDir)) Directory.CreateDirectory(saveDir);
 
         while (true && await source.OutputAvailableAsync())
         {
-                //接收新片段 且总是拿全部未处理的片段
+            // 接收新片段 且总是拿全部未处理的片段
-                //有时每次只有很少的片段，但是之前的片段下载慢，导致后面还没下载的片段都失效了
+            // 有时每次只有很少的片段，但是之前的片段下载慢，导致后面还没下载的片段都失效了
-                //TryReceiveAll可以稍微缓解一下
+            // TryReceiveAll可以稍微缓解一下
             source.TryReceiveAll(out IList<List<MediaSegment>>? segmentsList);
             var segments = segmentsList!.SelectMany(s => s);
             if (segments == null || !segments.Any()) continue;
             var segmentsDuration = segments.Sum(s => s.Duration);
             Logger.DebugMarkUp(string.Join(",", segments.Select(sss => GetSegmentName(sss, false, false))));
 
-                //下载init
+            // 下载init
             if (!initDownloaded && streamSpec.Playlist?.MediaInit != null) 
             {
                 task.MaxValue += 1;
-                    //对于fMP4，自动开启二进制合并
+                // 对于fMP4，自动开启二进制合并
                 if (!DownloaderConfig.MyOptions.BinaryMerge && streamSpec.MediaType != MediaType.SUBTITLES)
                 {
                     DownloaderConfig.MyOptions.BinaryMerge = true;
@@ -202,31 +197,31 @@ namespace N_m3u8DL_RE.DownloadManager
                 var path = Path.Combine(tmpDir, "_init.mp4.tmp");
                 var result = await Downloader.DownloadSegmentAsync(streamSpec.Playlist.MediaInit, path, speedContainer, headers);
                 FileDic[streamSpec.Playlist.MediaInit] = result;
-                    if (result == null || !result.Success)
+                if (result is not { Success: true })
                 {
                     throw new Exception("Download init file failed!");
                 }
                 mp4InitFile = result.ActualFilePath;
                 task.Increment(1);
 
-                    //读取mp4信息
+                // 读取mp4信息
-                    if (result != null && result.Success)
+                if (result is { Success: true })
                 {
                     currentKID = MP4DecryptUtil.GetMP4Info(result.ActualFilePath).KID;
-                        //从文件读取KEY
+                    // 从文件读取KEY
                     await SearchKeyAsync(currentKID);
-                        //实时解密
+                    // 实时解密
-                        if (DownloaderConfig.MyOptions.MP4RealTimeDecryption && !string.IsNullOrEmpty(currentKID) && StreamExtractor.ExtractorType != ExtractorType.MSS)
+                    if ((streamSpec.Playlist.MediaInit.IsEncrypted || !string.IsNullOrEmpty(currentKID)) && DownloaderConfig.MyOptions.MP4RealTimeDecryption && !string.IsNullOrEmpty(currentKID) && StreamExtractor.ExtractorType != ExtractorType.MSS)
                     {
                         var enc = result.ActualFilePath;
                         var dec = Path.Combine(Path.GetDirectoryName(enc)!, Path.GetFileNameWithoutExtension(enc) + "_dec" + Path.GetExtension(enc));
-                            var dResult = await MP4DecryptUtil.DecryptAsync(DownloaderConfig.MyOptions.UseShakaPackager, mp4decrypt, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID);
+                        var dResult = await MP4DecryptUtil.DecryptAsync(decryptEngine, decryptionBinaryPath, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID);
                         if (dResult)
                         {
                             FileDic[streamSpec.Playlist.MediaInit]!.ActualFilePath = dec;
                         }
                     }
-                        //ffmpeg读取信息
+                    // ffmpeg读取信息
                     if (!readInfo)
                     {
                         Logger.WarnMarkUp(ResString.readingInfo);
@@ -251,55 +246,55 @@ namespace N_m3u8DL_RE.DownloadManager
                 SamePathDic[task.Id] = allSamePath;
             }
 
-                //下载第一个分片
+            // 下载第一个分片
             if (!readInfo || StreamExtractor.ExtractorType == ExtractorType.MSS)
             {
                 var seg = segments.First();
                 segments = segments.Skip(1);
-                    //获取文件名
+                // 获取文件名
                 var filename = GetSegmentName(seg, allHasDatetime, SamePathDic[task.Id]);
                 var index = seg.Index;
                 var path = Path.Combine(tmpDir, filename + $".{streamSpec.Extension ?? "clip"}.tmp");
                 var result = await Downloader.DownloadSegmentAsync(seg, path, speedContainer, headers);
                 FileDic[seg] = result;
-                    if (result == null || !result.Success)
+                if (result is not { Success: true })
                 {
                     throw new Exception("Download first segment failed!");
                 }
                 task.Increment(1);
-                    if (result != null && result.Success)
+                if (result is { Success: true })
                 {
-                        //修复MSS init
+                    // 修复MSS init
                     if (StreamExtractor.ExtractorType == ExtractorType.MSS)
                     {
                         var processor = new MSSMoovProcessor(streamSpec);
                         var header = processor.GenHeader(File.ReadAllBytes(result.ActualFilePath));
                         await File.WriteAllBytesAsync(FileDic[streamSpec.Playlist!.MediaInit!]!.ActualFilePath, header);
-                            if (DownloaderConfig.MyOptions.MP4RealTimeDecryption && !string.IsNullOrEmpty(currentKID))
+                        if (seg.IsEncrypted && DownloaderConfig.MyOptions.MP4RealTimeDecryption && !string.IsNullOrEmpty(currentKID))
                         {
-                                //需要重新解密init
+                            // 需要重新解密init
                             var enc = FileDic[streamSpec.Playlist!.MediaInit!]!.ActualFilePath;
                             var dec = Path.Combine(Path.GetDirectoryName(enc)!, Path.GetFileNameWithoutExtension(enc) + "_dec" + Path.GetExtension(enc));
-                                var dResult = await MP4DecryptUtil.DecryptAsync(DownloaderConfig.MyOptions.UseShakaPackager, mp4decrypt, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID);
+                            var dResult = await MP4DecryptUtil.DecryptAsync(decryptEngine, decryptionBinaryPath, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID);
                             if (dResult)
                             {
                                 FileDic[streamSpec.Playlist!.MediaInit!]!.ActualFilePath = dec;
                             }
                         }
                     }
-                        //读取init信息
+                    // 读取init信息
                     if (string.IsNullOrEmpty(currentKID))
                     {
                         currentKID = MP4DecryptUtil.GetMP4Info(result.ActualFilePath).KID;
                     }
-                        //从文件读取KEY
+                    // 从文件读取KEY
                     await SearchKeyAsync(currentKID);
-                        //实时解密
+                    // 实时解密
-                        if (DownloaderConfig.MyOptions.MP4RealTimeDecryption && !string.IsNullOrEmpty(currentKID))
+                    if (seg.IsEncrypted && DownloaderConfig.MyOptions.MP4RealTimeDecryption && !string.IsNullOrEmpty(currentKID))
                     {
                         var enc = result.ActualFilePath;
                         var dec = Path.Combine(Path.GetDirectoryName(enc)!, Path.GetFileNameWithoutExtension(enc) + "_dec" + Path.GetExtension(enc));
-                            var dResult = await MP4DecryptUtil.DecryptAsync(DownloaderConfig.MyOptions.UseShakaPackager, mp4decrypt, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID, mp4InitFile);
+                        var dResult = await MP4DecryptUtil.DecryptAsync(decryptEngine, decryptionBinaryPath, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID, mp4InitFile);
                         if (dResult)
                         {
                             File.Delete(enc);
@@ -308,7 +303,7 @@ namespace N_m3u8DL_RE.DownloadManager
                     }
                     if (!readInfo)
                     {
-                            //ffmpeg读取信息
+                        // ffmpeg读取信息
                         Logger.WarnMarkUp(ResString.readingInfo);
                         mediaInfos = await MediainfoUtil.ReadInfoAsync(DownloaderConfig.MyOptions.FFmpegBinaryPath!, result!.ActualFilePath);
                         mediaInfos.ForEach(info => Logger.InfoMarkUp(info.ToStringMarkUp()));
@@ -322,27 +317,27 @@ namespace N_m3u8DL_RE.DownloadManager
                 }
             }
 
-                //开始下载
+            // 开始下载
             var options = new ParallelOptions()
             {
                 MaxDegreeOfParallelism = DownloaderConfig.MyOptions.ThreadCount
             };
             await Parallel.ForEachAsync(segments, options, async (seg, _) =>
             {
-                    //获取文件名
+                // 获取文件名
                 var filename = GetSegmentName(seg, allHasDatetime, SamePathDic[task.Id]);
                 var index = seg.Index;
                 var path = Path.Combine(tmpDir, filename + $".{streamSpec.Extension ?? "clip"}.tmp");
                 var result = await Downloader.DownloadSegmentAsync(seg, path, speedContainer, headers);
                 FileDic[seg] = result;
-                    if (result != null && result.Success)
+                if (result is { Success: true })
                     task.Increment(1);
-                    //实时解密
+                // 实时解密
-                    if (DownloaderConfig.MyOptions.MP4RealTimeDecryption && result != null && result.Success && !string.IsNullOrEmpty(currentKID))
+                if (seg.IsEncrypted && DownloaderConfig.MyOptions.MP4RealTimeDecryption && result is { Success: true } && !string.IsNullOrEmpty(currentKID))
                 {
                     var enc = result.ActualFilePath;
                     var dec = Path.Combine(Path.GetDirectoryName(enc)!, Path.GetFileNameWithoutExtension(enc) + "_dec" + Path.GetExtension(enc));
-                        var dResult = await MP4DecryptUtil.DecryptAsync(DownloaderConfig.MyOptions.UseShakaPackager, mp4decrypt, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID, mp4InitFile);
+                    var dResult = await MP4DecryptUtil.DecryptAsync(decryptEngine, decryptionBinaryPath, DownloaderConfig.MyOptions.Keys, enc, dec, currentKID, mp4InitFile);
                     if (dResult)
                     {
                         File.Delete(enc);
@@ -351,15 +346,14 @@ namespace N_m3u8DL_RE.DownloadManager
                 }
             });
 
-                //自动修复VTT raw字幕
+            // 自动修复VTT raw字幕
-                if (DownloaderConfig.MyOptions.AutoSubtitleFix && streamSpec.MediaType == Common.Enum.MediaType.SUBTITLES
+            if (DownloaderConfig.MyOptions.AutoSubtitleFix && streamSpec is { MediaType: Common.Enum.MediaType.SUBTITLES, Extension: not null } && streamSpec.Extension.Contains("vtt"))
-                    && streamSpec.Extension != null && streamSpec.Extension.Contains("vtt"))
             {
-                    //排序字幕并修正时间戳
+                // 排序字幕并修正时间戳
-                    var keys = FileDic.Keys.OrderBy(k => k.Index);
+                var keys = FileDic.Keys.OrderBy(k => k.Index).ToList();
                 foreach (var seg in keys)
                 {
-                        var vttContent = File.ReadAllText(FileDic[seg]!.ActualFilePath);
+                    var vttContent = await File.ReadAllTextAsync(FileDic[seg]!.ActualFilePath);
                     var waitCount = 0;
                     while (DownloaderConfig.MyOptions.LiveFixVttByAudio && audioStart == null && waitCount++ < 5)
                     {
@@ -367,7 +361,7 @@ namespace N_m3u8DL_RE.DownloadManager
                     }
                     var subOffset = audioStart != null ? (long)audioStart.Value.TotalMilliseconds : 0L;
                     var vtt = WebVttSub.Parse(vttContent, subOffset);
-                        //手动计算MPEGTS
+                    // 手动计算MPEGTS
                     if (currentVtt.MpegtsTimestamp == 0 && vtt.MpegtsTimestamp == 0)
                     {
                         vtt.MpegtsTimestamp = 90000 * (long)keys.Where(s => s.Index < seg.Index).Sum(s => s.Duration);
@@ -377,11 +371,11 @@ namespace N_m3u8DL_RE.DownloadManager
                 }
             }
 
-                //自动修复VTT mp4字幕
+            // 自动修复VTT mp4字幕
             if (DownloaderConfig.MyOptions.AutoSubtitleFix && streamSpec.MediaType == Common.Enum.MediaType.SUBTITLES
                                                            && streamSpec.Codecs != "stpp" && streamSpec.Extension != null && streamSpec.Extension.Contains("m4s"))
             {
-                    var initFile = FileDic.Values.Where(v => Path.GetFileName(v!.ActualFilePath).StartsWith("_init")).FirstOrDefault();
+                var initFile = FileDic.Values.FirstOrDefault(v => Path.GetFileName(v!.ActualFilePath).StartsWith("_init"));
                 var iniFileBytes = File.ReadAllBytes(initFile!.ActualFilePath);
                 var (sawVtt, timescale) = MP4VttUtil.CheckInit(iniFileBytes);
                 if (sawVtt)
@@ -400,11 +394,10 @@ namespace N_m3u8DL_RE.DownloadManager
                 }
             }
 
-                //自动修复TTML raw字幕
+            // 自动修复TTML raw字幕
-                if (DownloaderConfig.MyOptions.AutoSubtitleFix && streamSpec.MediaType == Common.Enum.MediaType.SUBTITLES
+            if (DownloaderConfig.MyOptions.AutoSubtitleFix && streamSpec is { MediaType: Common.Enum.MediaType.SUBTITLES, Extension: not null } && streamSpec.Extension.Contains("ttml"))
-                    && streamSpec.Extension != null && streamSpec.Extension.Contains("ttml"))
             {
-                    var keys = FileDic.OrderBy(s => s.Key.Index).Where(v => v.Value!.ActualFilePath.EndsWith(".m4s")).Select(s => s.Key);
+                var keys = FileDic.OrderBy(s => s.Key.Index).Where(v => v.Value!.ActualFilePath.EndsWith(".m4s")).Select(s => s.Key).ToList();
                 if (firstSub)
                 {
                     if (baseTimestamp != 0)
@@ -416,7 +409,7 @@ namespace N_m3u8DL_RE.DownloadManager
                     foreach (var seg in keys)
                     {
                         var vtt = MP4TtmlUtil.ExtractFromTTML(FileDic[seg]!.ActualFilePath, 0, baseTimestamp);
-                            //手动计算MPEGTS
+                        // 手动计算MPEGTS
                         if (currentVtt.MpegtsTimestamp == 0 && vtt.MpegtsTimestamp == 0)
                         {
                             vtt.MpegtsTimestamp = 90000 * (long)keys.Where(s => s.Index < seg.Index).Sum(s => s.Duration);
@@ -431,7 +424,7 @@ namespace N_m3u8DL_RE.DownloadManager
                     foreach (var seg in keys)
                     {
                         var vtt = MP4TtmlUtil.ExtractFromTTML(FileDic[seg]!.ActualFilePath, 0, baseTimestamp);
-                            //手动计算MPEGTS
+                        // 手动计算MPEGTS
                         if (currentVtt.MpegtsTimestamp == 0 && vtt.MpegtsTimestamp == 0)
                         {
                             vtt.MpegtsTimestamp = 90000 * (RecordedDurDic[task.Id] + (long)keys.Where(s => s.Index < seg.Index).Sum(s => s.Duration));
@@ -441,15 +434,14 @@ namespace N_m3u8DL_RE.DownloadManager
                 }
             }
 
-                //自动修复TTML mp4字幕
+            // 自动修复TTML mp4字幕
-                if (DownloaderConfig.MyOptions.AutoSubtitleFix && streamSpec.MediaType == Common.Enum.MediaType.SUBTITLES
+            if (DownloaderConfig.MyOptions.AutoSubtitleFix && streamSpec is { MediaType: Common.Enum.MediaType.SUBTITLES, Extension: not null } && streamSpec.Extension.Contains("m4s")
-                    && streamSpec.Extension != null && streamSpec.Extension.Contains("m4s")
                 && streamSpec.Codecs != null && streamSpec.Codecs.Contains("stpp"))
             {
-                    //sawTtml暂时不判断
+                // sawTtml暂时不判断
-                    //var initFile = FileDic.Values.Where(v => Path.GetFileName(v!.ActualFilePath).StartsWith("_init")).FirstOrDefault();
+                // var initFile = FileDic.Values.Where(v => Path.GetFileName(v!.ActualFilePath).StartsWith("_init")).FirstOrDefault();
-                    //var iniFileBytes = File.ReadAllBytes(initFile!.ActualFilePath);
+                // var iniFileBytes = File.ReadAllBytes(initFile!.ActualFilePath);
-                    //var sawTtml = MP4TtmlUtil.CheckInit(iniFileBytes);
+                // var sawTtml = MP4TtmlUtil.CheckInit(iniFileBytes);
                 var keys = FileDic.OrderBy(s => s.Key.Index).Where(v => v.Value!.ActualFilePath.EndsWith(".m4s")).Select(s => s.Key);
                 if (firstSub)
                 {
@@ -462,7 +454,7 @@ namespace N_m3u8DL_RE.DownloadManager
                     foreach (var seg in keys)
                     {
                         var vtt = MP4TtmlUtil.ExtractFromMp4(FileDic[seg]!.ActualFilePath, 0, baseTimestamp);
-                            //手动计算MPEGTS
+                        // 手动计算MPEGTS
                         if (currentVtt.MpegtsTimestamp == 0 && vtt.MpegtsTimestamp == 0)
                         {
                             vtt.MpegtsTimestamp = 90000 * (long)keys.Where(s => s.Index < seg.Index).Sum(s => s.Duration);
@@ -477,7 +469,7 @@ namespace N_m3u8DL_RE.DownloadManager
                     foreach (var seg in keys)
                     {
                         var vtt = MP4TtmlUtil.ExtractFromMp4(FileDic[seg]!.ActualFilePath, 0, baseTimestamp);
-                            //手动计算MPEGTS
+                        // 手动计算MPEGTS
                         if (currentVtt.MpegtsTimestamp == 0 && vtt.MpegtsTimestamp == 0)
                         {
                             vtt.MpegtsTimestamp = 90000 * (RecordedDurDic[task.Id] + (long)keys.Where(s => s.Index < seg.Index).Sum(s => s.Duration));
@@ -489,7 +481,7 @@ namespace N_m3u8DL_RE.DownloadManager
 
             RecordedDurDic[task.Id] += (int)segmentsDuration;
 
-                /*//写出m3u8
+            /*// 写出m3u8
             if (DownloaderConfig.MyOptions.LiveWriteHLS)
             {
                 var _saveDir = DownloaderConfig.MyOptions.SaveDir ?? Environment.CurrentDirectory;
@@ -497,33 +489,32 @@ namespace N_m3u8DL_RE.DownloadManager
                 await StreamingUtil.WriteStreamListAsync(FileDic, task.Id, 0, _saveName, _saveDir);
             }*/
 
-                //合并逻辑
+            // 合并逻辑
             if (DownloaderConfig.MyOptions.LiveRealTimeMerge)
             {
-                    //合并
+                // 合并
                 var outputExt = "." + streamSpec.Extension;
                 if (streamSpec.Extension == null) outputExt = ".ts";
-                    else if (streamSpec.MediaType == MediaType.AUDIO && streamSpec.Extension == "m4s") outputExt = ".m4a";
+                else if (streamSpec is { MediaType: MediaType.AUDIO, Extension: "m4s" }) outputExt = ".m4a";
                 else if (streamSpec.MediaType != MediaType.SUBTITLES && streamSpec.Extension == "m4s") outputExt = ".mp4";
                 else if (streamSpec.MediaType == MediaType.SUBTITLES)
                 {
-                        if (DownloaderConfig.MyOptions.SubtitleFormat == Enum.SubtitleFormat.SRT) outputExt = ".srt";
+                    outputExt = DownloaderConfig.MyOptions.SubtitleFormat == Enum.SubtitleFormat.SRT ? ".srt" : ".vtt";
-                        else outputExt = ".vtt";
                 }
 
                 var output = Path.Combine(saveDir, saveName + outputExt);
 
-                    //移除无效片段
+                // 移除无效片段
                 var badKeys = FileDic.Where(i => i.Value == null).Select(i => i.Key);
                 foreach (var badKey in badKeys)
                 {
                     FileDic!.Remove(badKey, out _);
                 }
 
-                    //设置输出流
+                // 设置输出流
                 if (fileOutputStream == null)
                 {
-                        //检测目标文件是否存在
+                    // 检测目标文件是否存在
                     while (File.Exists(output))
                     {
                         Logger.WarnMarkUp($"{Path.GetFileName(output)} => {Path.GetFileName(output = Path.ChangeExtension(output, $"copy" + Path.GetExtension(output)))}");
@@ -535,20 +526,20 @@ namespace N_m3u8DL_RE.DownloadManager
                     }
                     else 
                     {
-                            //创建管道
+                        // 创建管道
                         output = Path.ChangeExtension(output, ".ts");
                         var pipeName = $"RE_pipe_{Guid.NewGuid()}";
                         fileOutputStream = PipeUtil.CreatePipe(pipeName);
                         Logger.InfoMarkUp($"{ResString.namedPipeCreated} [cyan]{pipeName.EscapeMarkup()}[/]");
                         PipeSteamNamesDic[task.Id] = pipeName;
-                            if (PipeSteamNamesDic.Count == SelectedSteams.Where(x => x.MediaType != MediaType.SUBTITLES).Count()) 
+                        if (PipeSteamNamesDic.Count == SelectedSteams.Count(x => x.MediaType != MediaType.SUBTITLES)) 
                         {
                             var names = PipeSteamNamesDic.OrderBy(i => i.Key).Select(k => k.Value).ToArray();
                             Logger.WarnMarkUp($"{ResString.namedPipeMux} [deepskyblue1]{Path.GetFileName(output).EscapeMarkup()}[/]");
                             var t = PipeUtil.StartPipeMuxAsync(DownloaderConfig.MyOptions.FFmpegBinaryPath!, names, output);
                         }
 
-                            //Windows only
+                        // Windows only
                         if (OperatingSystem.IsWindows())
                             await (fileOutputStream as NamedPipeServerStream)!.WaitForConnectionAsync();
                     }
@@ -560,10 +551,10 @@ namespace N_m3u8DL_RE.DownloadManager
                     var files = FileDic.Where(f => f.Key != streamSpec.Playlist!.MediaInit).OrderBy(s => s.Key.Index).Select(f => f.Value).Select(v => v!.ActualFilePath).ToArray();
                     if (initResult != null && mp4InitFile != "")
                     {
-                            //shaka实时解密不需要init文件用于合并，mp4decrpyt需要
+                        // shaka/ffmpeg实时解密不需要init文件用于合并，mp4decrpyt需要
-                            if (!DownloaderConfig.MyOptions.UseShakaPackager)
+                        if (string.IsNullOrEmpty(currentKID) || decryptEngine == DecryptEngine.MP4DECRYPT)
                         {
-                                files = new string[] { initResult.ActualFilePath }.Concat(files).ToArray();
+                            files = [initResult.ActualFilePath, ..files];
                         }
                     }
                     foreach (var inputFilePath in files)
@@ -598,7 +589,7 @@ namespace N_m3u8DL_RE.DownloadManager
                         }
                     }
 
-                        //处理图形字幕
+                    // 处理图形字幕
                     await SubtitleUtil.TryWriteImagePngsAsync(currentVtt, tmpDir);
 
                     var subText = currentVtt.ToVtt();
@@ -616,7 +607,7 @@ namespace N_m3u8DL_RE.DownloadManager
                     }
                 }
 
-                    //刷新buffer
+                // 刷新buffer
                 if (fileOutputStream != null)
                 {
                     fileOutputStream.Flush();
@@ -627,11 +618,11 @@ namespace N_m3u8DL_RE.DownloadManager
                 break;
         }
 
-            if (fileOutputStream != null)
+        if (fileOutputStream == null) return true;
-            {
+        
         if (!DownloaderConfig.MyOptions.LivePipeMux)
         {
-                    //记录所有文件信息
+            // 记录所有文件信息
             OutputFiles.Add(new OutputFile()
             {
                 Index = task.Id,
@@ -644,7 +635,6 @@ namespace N_m3u8DL_RE.DownloadManager
         }
         fileOutputStream.Close();
         fileOutputStream.Dispose();
-            }
 
         return true;
     }
@@ -653,17 +643,16 @@ namespace N_m3u8DL_RE.DownloadManager
     {
         while (!STOP_FLAG)
         {
-                if (WAIT_SEC != 0)
+            if (WAIT_SEC == 0) continue;
-                {
-                    //1. MPD 所有URL相同 单次请求即可获得所有轨道的信息
-                    //2. M3U8 所有URL不同 才需要多次请求
             
+            // 1. MPD 所有URL相同 单次请求即可获得所有轨道的信息
+            // 2. M3U8 所有URL不同 才需要多次请求
             await Parallel.ForEachAsync(dic, async (dic, _) =>
             {
                 var streamSpec = dic.Key;
                 var task = dic.Value;
 
-                        //达到上限时 不需要刷新了
+                // 达到上限时 不需要刷新了
                 if (RecordLimitReachedDic[task.Id])
                     return;
 
@@ -674,20 +663,20 @@ namespace N_m3u8DL_RE.DownloadManager
                     var allSamePath = allName.Count() > 1 && allName.Distinct().Count() == 1;
                     SamePathDic[task.Id] = allSamePath;
                 }
-                        //过滤不需要下载的片段
+                // 过滤不需要下载的片段
                 FilterMediaSegments(streamSpec, task, allHasDatetime, SamePathDic[task.Id]);
                 var newList = streamSpec.Playlist!.MediaParts[0].MediaSegments;
                 if (newList.Count > 0)
                 {
                     task.MaxValue += newList.Count;
-                            //推送给消费者
+                    // 推送给消费者
                     await BlockDic[task.Id].SendAsync(newList);
-                            //更新最新链接
+                    // 更新最新链接
                     LastFileNameDic[task.Id] = GetSegmentName(newList.Last(), allHasDatetime, SamePathDic[task.Id]);
-                            //尝试更新时间戳
+                    // 尝试更新时间戳
                     var dt = newList.Last().DateTime;
                     DateTimeDic[task.Id] = dt != null ? GetUnixTimestamp(dt.Value) : 0L;
-                            //累加已获取到的时长
+                    // 累加已获取到的时长
                     RefreshedDurDic[task.Id] += (int)newList.Sum(s => s.Duration);
                 }
 
@@ -696,8 +685,8 @@ namespace N_m3u8DL_RE.DownloadManager
                     RecordLimitReachedDic[task.Id] = true;
                 }
 
-                        //检测时长限制
+                // 检测时长限制
-                        if (!STOP_FLAG && RecordLimitReachedDic.Values.All(x => x == true))
+                if (!STOP_FLAG && RecordLimitReachedDic.Values.All(x => x))
                 {
                     Logger.WarnMarkUp($"[darkorange3_1]{ResString.liveLimitReached}[/]");
                     STOP_FLAG = true;
@@ -707,20 +696,20 @@ namespace N_m3u8DL_RE.DownloadManager
 
             try
             {
-                        //Logger.WarnMarkUp($"wait {waitSec}s");
+                // Logger.WarnMarkUp($"wait {waitSec}s");
                 if (!STOP_FLAG) await Task.Delay(WAIT_SEC * 1000, CancellationTokenSource.Token);
-                        //刷新列表
+                // 刷新列表
                 if (!STOP_FLAG) await StreamExtractor.RefreshPlayListAsync(dic.Keys.ToList());
             }
             catch (OperationCanceledException oce) when (oce.CancellationToken == CancellationTokenSource.Token)
             {
-                        //不需要做事
+                // 不需要做事
             }
             catch (Exception e)
             {
                 Logger.ErrorMarkUp(e);
                 STOP_FLAG = true;
-                        //停止所有Block
+                // 停止所有Block
                 foreach (var target in BlockDic.Values)
                 {
                     target.Complete();
@@ -728,7 +717,6 @@ namespace N_m3u8DL_RE.DownloadManager
             }
         }
     }
-        }
 
     private void FilterMediaSegments(StreamSpec streamSpec, ProgressTask task, bool allHasDatetime, bool allSamePath)
     {
@@ -738,7 +726,7 @@ namespace N_m3u8DL_RE.DownloadManager
         var dateTime = DateTimeDic[task.Id];
         var lastName = LastFileNameDic[task.Id];
 
-            //优先使用dateTime判断
+        // 优先使用dateTime判断
         if (dateTime != 0 && streamSpec.Playlist!.MediaParts[0].MediaSegments.All(s => s.DateTime != null)) 
         {
             index = streamSpec.Playlist!.MediaParts[0].MediaSegments.FindIndex(s => GetUnixTimestamp(s.DateTime!.Value) == dateTime);
@@ -750,7 +738,7 @@ namespace N_m3u8DL_RE.DownloadManager
 
         if (index > -1)
         {
-                //修正Index
+            // 修正Index
             var list = streamSpec.Playlist!.MediaParts[0].MediaSegments.Skip(index + 1).ToList();
             if (list.Count > 0)
             {
@@ -773,27 +761,27 @@ namespace N_m3u8DL_RE.DownloadManager
     public async Task<bool> StartRecordAsync()
     {
         var takeLastCount = DownloaderConfig.MyOptions.LiveTakeCount;
-            ConcurrentDictionary<int, SpeedContainer> SpeedContainerDic = new(); //速度计算
+        ConcurrentDictionary<int, SpeedContainer> SpeedContainerDic = new(); // 速度计算
         ConcurrentDictionary<StreamSpec, bool?> Results = new();
-            //同步流
+        // 同步流
         FilterUtil.SyncStreams(SelectedSteams, takeLastCount);
-            //设置等待时间
+        // 设置等待时间
         if (WAIT_SEC == 0)
         {
             WAIT_SEC = (int)(SelectedSteams.Min(s => s.Playlist!.MediaParts[0].MediaSegments.Sum(s => s.Duration)) / 2);
-                WAIT_SEC -= 2; //再提前两秒吧 留出冗余
+            WAIT_SEC -= 2; // 再提前两秒吧 留出冗余
             if (DownloaderConfig.MyOptions.LiveWaitTime != null)
                 WAIT_SEC = DownloaderConfig.MyOptions.LiveWaitTime.Value;
             if (WAIT_SEC <= 0) WAIT_SEC = 1;
             Logger.WarnMarkUp($"set refresh interval to {WAIT_SEC} seconds");
         }
-            //如果没有选中音频 取消通过音频修复vtt时间轴
+        // 如果没有选中音频 取消通过音频修复vtt时间轴
-            if (!SelectedSteams.Any(x => x.MediaType == MediaType.AUDIO))
+        if (SelectedSteams.All(x => x.MediaType != MediaType.AUDIO))
         {
             DownloaderConfig.MyOptions.LiveFixVttByAudio = false;
         }
 
-            /*//写出master
+        /*// 写出master
         if (DownloaderConfig.MyOptions.LiveWriteHLS)
         {
             var saveDir = DownloaderConfig.MyOptions.SaveDir ?? Environment.CurrentDirectory;
@@ -804,14 +792,14 @@ namespace N_m3u8DL_RE.DownloadManager
         var progress = CustomAnsiConsole.Console.Progress().AutoClear(true);
         progress.AutoRefresh = DownloaderConfig.MyOptions.LogLevel != LogLevel.OFF;
             
-            //进度条的列定义
+        // 进度条的列定义
         var progressColumns = new ProgressColumn[]
         {
             new TaskDescriptionColumn() { Alignment = Justify.Left },
-                new RecordingDurationColumn(RecordedDurDic, RefreshedDurDic), //时长显示
+            new RecordingDurationColumn(RecordedDurDic, RefreshedDurDic), // 时长显示
             new RecordingStatusColumn(),
             new PercentageColumn(),
-                new DownloadSpeedColumn(SpeedContainerDic), //速度计算
+            new DownloadSpeedColumn(SpeedContainerDic), // 速度计算
             new SpinnerColumn(),
         };
         if (DownloaderConfig.MyOptions.NoAnsiColor)
@@ -822,12 +810,12 @@ namespace N_m3u8DL_RE.DownloadManager
 
         await progress.StartAsync(async ctx =>
         {
-                //创建任务
+            // 创建任务
             var dic = SelectedSteams.Select(item =>
             {
                 var task = ctx.AddTask(item.ToShortShortString(), autoStart: false, maxValue: 0);
-                    SpeedContainerDic[task.Id] = new SpeedContainer(); //速度计算
+                SpeedContainerDic[task.Id] = new SpeedContainer(); // 速度计算
-                    //限速设置
+                // 限速设置
                 if (DownloaderConfig.MyOptions.MaxSpeed != null)
                 {
                     SpeedContainerDic[task.Id].SpeedLimit = DownloaderConfig.MyOptions.MaxSpeed.Value;
@@ -837,29 +825,28 @@ namespace N_m3u8DL_RE.DownloadManager
                 DateTimeDic[task.Id] = 0L;
                 RecordedDurDic[task.Id] = 0;
                 RefreshedDurDic[task.Id] = 0;
-                    MaxIndexDic[task.Id] = item.Playlist?.MediaParts[0].MediaSegments.LastOrDefault()?.Index ?? 0L; //最大Index
+                MaxIndexDic[task.Id] = item.Playlist?.MediaParts[0].MediaSegments.LastOrDefault()?.Index ?? 0L; // 最大Index
                 BlockDic[task.Id] = new BufferBlock<List<MediaSegment>>();
                 return (item, task);
             }).ToDictionary(item => item.item, item => item.task);
 
             DownloaderConfig.MyOptions.ConcurrentDownload = true;
             DownloaderConfig.MyOptions.MP4RealTimeDecryption = true;
-                DownloaderConfig.MyOptions.LiveRecordLimit = DownloaderConfig.MyOptions.LiveRecordLimit ?? TimeSpan.MaxValue;
+            DownloaderConfig.MyOptions.LiveRecordLimit ??= TimeSpan.MaxValue;
-                if (DownloaderConfig.MyOptions.MP4RealTimeDecryption && !DownloaderConfig.MyOptions.UseShakaPackager
+            if (DownloaderConfig.MyOptions is { MP4RealTimeDecryption: true, DecryptionEngine: not DecryptEngine.SHAKA_PACKAGER, Keys.Length: > 0 })
-                    && DownloaderConfig.MyOptions.Keys != null && DownloaderConfig.MyOptions.Keys.Length > 0)
                 Logger.WarnMarkUp($"[darkorange3_1]{ResString.realTimeDecMessage}[/]");
             var limit = DownloaderConfig.MyOptions.LiveRecordLimit;
             if (limit != TimeSpan.MaxValue)
                 Logger.WarnMarkUp($"[darkorange3_1]{ResString.liveLimit}{GlobalUtil.FormatTime((int)limit.Value.TotalSeconds)}[/]");
-                //录制直播时，用户选了几个流就并发录几个
+            // 录制直播时，用户选了几个流就并发录几个
             var options = new ParallelOptions()
             {
                 MaxDegreeOfParallelism = SelectedSteams.Count
             };
-                //开始刷新
+            // 开始刷新
             var producerTask = PlayListProduceAsync(dic);
             await Task.Delay(200);
-                //并发下载
+            // 并发下载
             await Parallel.ForEachAsync(dic, options, async (kp, _) =>
             {
                 var task = kp.Value;
@@ -870,8 +857,8 @@ namespace N_m3u8DL_RE.DownloadManager
 
         var success = Results.Values.All(v => v == true);
 
-            //删除临时文件夹
+        // 删除临时文件夹
-            if (!DownloaderConfig.MyOptions.SkipMerge && DownloaderConfig.MyOptions.DelAfterDone && success)
+        if (DownloaderConfig.MyOptions is { SkipMerge: false, DelAfterDone: true } && success)
         {
             foreach (var item in StreamExtractor.RawFiles)
             {
@@ -881,12 +868,12 @@ namespace N_m3u8DL_RE.DownloadManager
             OtherUtil.SafeDeleteDir(DownloaderConfig.DirPrefix);
         }
 
-            //混流
+        // 混流
         if (success && DownloaderConfig.MyOptions.MuxAfterDone && OutputFiles.Count > 0)
         {
             OutputFiles = OutputFiles.OrderBy(o => o.Index).ToList();
-                //是否跳过字幕
+            // 是否跳过字幕
-                if (DownloaderConfig.MyOptions.MuxOptions.SkipSubtitle)
+            if (DownloaderConfig.MyOptions.MuxOptions!.SkipSubtitle)
             {
                 OutputFiles = OutputFiles.Where(o => o.MediaType != MediaType.SUBTITLES).ToList();
             }
@@ -896,15 +883,15 @@ namespace N_m3u8DL_RE.DownloadManager
             }
             OutputFiles.ForEach(f => Logger.WarnMarkUp($"[grey]{Path.GetFileName(f.FilePath).EscapeMarkup()}[/]"));
             var saveDir = DownloaderConfig.MyOptions.SaveDir ?? Environment.CurrentDirectory;
-                var ext = DownloaderConfig.MyOptions.MuxOptions.MuxToMp4 ? ".mp4" : ".mkv";
+            var ext = OtherUtil.GetMuxExtension(DownloaderConfig.MyOptions.MuxOptions.MuxFormat);
             var dirName = Path.GetFileName(DownloaderConfig.DirPrefix);
             var outName = $"{dirName}.MUX";
             var outPath = Path.Combine(saveDir, outName);
             Logger.WarnMarkUp($"Muxing to [grey]{outName.EscapeMarkup()}{ext}[/]");
             var result = false;
             if (DownloaderConfig.MyOptions.MuxOptions.UseMkvmerge) result = MergeUtil.MuxInputsByMkvmerge(DownloaderConfig.MyOptions.MkvmergeBinaryPath!, OutputFiles.ToArray(), outPath);
-                else result = MergeUtil.MuxInputsByFFmpeg(DownloaderConfig.MyOptions.FFmpegBinaryPath!, OutputFiles.ToArray(), outPath, DownloaderConfig.MyOptions.MuxOptions.MuxToMp4, !DownloaderConfig.MyOptions.NoDateInfo);
+            else result = MergeUtil.MuxInputsByFFmpeg(DownloaderConfig.MyOptions.FFmpegBinaryPath!, OutputFiles.ToArray(), outPath, DownloaderConfig.MyOptions.MuxOptions.MuxFormat, !DownloaderConfig.MyOptions.NoDateInfo);
-                //完成后删除各轨道文件
+            // 完成后删除各轨道文件
             if (result)
             {
                 if (!DownloaderConfig.MyOptions.MuxOptions.KeepFiles)
@@ -920,7 +907,7 @@ namespace N_m3u8DL_RE.DownloadManager
                 success = false;
                 Logger.ErrorMarkUp($"Mux failed");
             }
-                //判断是否要改名
+            // 判断是否要改名
             var newPath = Path.ChangeExtension(outPath, ext);
             if (result && !File.Exists(newPath))
             {
@@ -931,5 +918,4 @@ namespace N_m3u8DL_RE.DownloadManager
 
         return success;
     }
-    }
 }

src/N_m3u8DL-RE/Downloader/IDownloader.cs

@@ -1,15 +1,9 @@
 using N_m3u8DL_RE.Common.Entity;
 using N_m3u8DL_RE.Entity;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Downloader
+namespace N_m3u8DL_RE.Downloader;
+
+internal interface IDownloader
 {
-    internal interface IDownloader
-    {
     Task<DownloadResult?> DownloadSegmentAsync(MediaSegment segment, string savePath, SpeedContainer speedContainer, Dictionary<string, string>? headers = null);
-    }
 }

src/N_m3u8DL-RE/Downloader/SimpleDownloader.cs

@@ -6,23 +6,14 @@ using N_m3u8DL_RE.Crypto;
 using N_m3u8DL_RE.Entity;
 using N_m3u8DL_RE.Util;
 using Spectre.Console;
-using System;
-using System.Collections.Concurrent;
-using System.Collections.Generic;
-using System.Data;
-using System.Diagnostics;
-using System.Linq;
-using System.Text;
-using System.Threading;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Downloader
+namespace N_m3u8DL_RE.Downloader;
+
+/// <summary>
+/// 简单下载器
+/// </summary>
+internal class SimpleDownloader : IDownloader
 {
-    /// <summary>
-    /// 简单下载器
-    /// </summary>
-    internal class SimpleDownloader : IDownloader
-    {
     DownloaderConfig DownloaderConfig;
 
     public SimpleDownloader(DownloaderConfig config)
@@ -34,23 +25,25 @@ namespace N_m3u8DL_RE.Downloader
     {
         var url = segment.Url;
         var (des, dResult) = await DownClipAsync(url, savePath, speedContainer, segment.StartRange, segment.StopRange, headers, DownloaderConfig.MyOptions.DownloadRetryCount);
-            if (dResult != null && dResult.Success && dResult.ActualFilePath != des)
+        if (dResult is { Success: true } && dResult.ActualFilePath != des)
         {
-                if (segment.EncryptInfo != null)
+            switch (segment.EncryptInfo.Method)
             {
-                    if (segment.EncryptInfo.Method == EncryptMethod.AES_128)
+                case EncryptMethod.AES_128:
                 {
                     var key = segment.EncryptInfo.Key;
                     var iv = segment.EncryptInfo.IV;
                     AESUtil.AES128Decrypt(dResult.ActualFilePath, key!, iv!);
+                    break;
                 }
-                    else if (segment.EncryptInfo.Method == EncryptMethod.AES_128_ECB)
+                case EncryptMethod.AES_128_ECB:
                 {
                     var key = segment.EncryptInfo.Key;
                     var iv = segment.EncryptInfo.IV;
                     AESUtil.AES128Decrypt(dResult.ActualFilePath, key!, iv!, System.Security.Cryptography.CipherMode.ECB);
+                    break;
                 }
-                    else if (segment.EncryptInfo.Method == EncryptMethod.CHACHA20)
+                case EncryptMethod.CHACHA20:
                 {
                     var key = segment.EncryptInfo.Key;
                     var nonce = segment.EncryptInfo.IV;
@@ -58,25 +51,25 @@ namespace N_m3u8DL_RE.Downloader
                     var fileBytes = File.ReadAllBytes(dResult.ActualFilePath);
                     var decrypted = ChaCha20Util.DecryptPer1024Bytes(fileBytes, key!, nonce!);
                     await File.WriteAllBytesAsync(dResult.ActualFilePath, decrypted);
+                    break;
                 }
-                    else if (segment.EncryptInfo.Method == EncryptMethod.SAMPLE_AES_CTR)
+                case EncryptMethod.SAMPLE_AES_CTR:
-                    {
+                    // throw new NotSupportedException("SAMPLE-AES-CTR");
-                        //throw new NotSupportedException("SAMPLE-AES-CTR");
+                    break;
             }
 
-                    //Image头处理
+            // Image头处理
             if (dResult.ImageHeader)
             {
                 await ImageHeaderUtil.ProcessAsync(dResult.ActualFilePath);
             }
-                    //Gzip解压
+            // Gzip解压
             if (dResult.GzipHeader)
             {
                 await OtherUtil.DeGzipFileAsync(dResult.ActualFilePath);
             }
-                }
 
-                //处理完成后改名
+            // 处理完成后改名
             File.Move(dResult.ActualFilePath, des);
             dResult.ActualFilePath = des;
         }
@@ -92,14 +85,14 @@ namespace N_m3u8DL_RE.Downloader
             cancellationTokenSource = new();
             var des = Path.ChangeExtension(path, null);
 
-                //已下载跳过
+            // 已下载跳过
             if (File.Exists(des))
             {
                 speedContainer.Add(new FileInfo(des).Length);
                 return (des, new DownloadResult() { ActualContentLength = 0, ActualFilePath = des });
             }
 
-                //已解密跳过
+            // 已解密跳过
             var dec = Path.Combine(Path.GetDirectoryName(des)!, Path.GetFileNameWithoutExtension(des) + "_dec" + Path.GetExtension(des));
             if (File.Exists(dec))
             {
@@ -107,15 +100,16 @@ namespace N_m3u8DL_RE.Downloader
                 return (dec, new DownloadResult() { ActualContentLength = 0, ActualFilePath = dec });
             }
 
-                //另起线程进行监控
+            // 另起线程进行监控
+            var cts = cancellationTokenSource;
             using var watcher = Task.Factory.StartNew(async () =>
             {
                 while (true)
                 {
-                        if (cancellationTokenSource == null || cancellationTokenSource.IsCancellationRequested) break;
+                    if (cts.IsCancellationRequested) break;
                     if (speedContainer.ShouldStop)
                     {
-                            cancellationTokenSource.Cancel();
+                        cts.Cancel();
                         Logger.DebugMarkUp("Cancel...");
                         break;
                     }
@@ -123,7 +117,7 @@ namespace N_m3u8DL_RE.Downloader
                 }
             });
 
-                //调用下载
+            // 调用下载
             var result = await DownloadUtil.DownloadToFileAsync(url, path, speedContainer, cancellationTokenSource, headers, fromPosition, toPosition);
             return (des, result);
 
@@ -132,7 +126,7 @@ namespace N_m3u8DL_RE.Downloader
         catch (Exception ex)
         {
             Logger.DebugMarkUp($"[grey]{ex.Message.EscapeMarkup()} retryCount: {retryCount}[/]");
-                Logger.Debug(url + " " + ex.ToString());
+            Logger.Debug(url + " " + ex);
             Logger.Extra($"Ah oh!{Environment.NewLine}RetryCount => {retryCount}{Environment.NewLine}Exception  => {ex.Message}{Environment.NewLine}Url        => {url}");
             if (retryCount-- > 0)
             {
@@ -144,18 +138,17 @@ namespace N_m3u8DL_RE.Downloader
                 Logger.Extra($"The retry attempts have been exhausted and the download of this segment has failed.{Environment.NewLine}Exception  => {ex.Message}{Environment.NewLine}Url        => {url}");
                 Logger.WarnMarkUp($"[grey]{ex.Message.EscapeMarkup()}[/]");
             }
-                //throw new Exception("download failed", ex);
+            // throw new Exception("download failed", ex);
             return default;
         }
         finally
         {
             if (cancellationTokenSource != null)
             {
-                    //调用后销毁
+                // 调用后销毁
                 cancellationTokenSource.Dispose();
                 cancellationTokenSource = null;
             }
         }
     }
-    }
 }

src/N_m3u8DL-RE/Entity/CustomRange.cs

@@ -1,13 +1,7 @@
-using System;
+namespace N_m3u8DL_RE.Entity;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Entity
+public class CustomRange
 {
-    public class CustomRange
-    {
     public required string InputStr { get; set; }
     public double? StartSec { get; set; }
     public double? EndSec { get; set; }
@@ -19,5 +13,4 @@ namespace N_m3u8DL_RE.Entity
     {
         return $"StartSec: {StartSec}, EndSec: {EndSec}, StartSegIndex: {StartSegIndex}, EndSegIndex: {EndSegIndex}";
     }
-    }
 }

src/N_m3u8DL-RE/Entity/DownloadResult.cs

@@ -1,19 +1,11 @@
-using System;
+namespace N_m3u8DL_RE.Entity;
-using System.Collections.Concurrent;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Entity
+internal class DownloadResult
 {
-    internal class DownloadResult
+    public bool Success => (ActualContentLength != null && RespContentLength != null) ? (RespContentLength == ActualContentLength) : (ActualContentLength != null);
-    {
-        public bool Success { get => (ActualContentLength != null && RespContentLength != null) ? (RespContentLength == ActualContentLength) : (ActualContentLength == null ? false : true); }
     public long? RespContentLength { get; set; }
     public long? ActualContentLength { get; set; }
-        public bool ImageHeader { get; set; } = false; //图片伪装
+    public bool ImageHeader { get; set; } = false; // 图片伪装
-        public bool GzipHeader { get; set; } = false; //GZip压缩
+    public bool GzipHeader { get; set; } = false; // GZip压缩
     public required string ActualFilePath { get; set; }
-    }
 }

src/N_m3u8DL-RE/Entity/Mediainfo.cs

@@ -1,14 +1,9 @@
-using System;
+using Spectre.Console;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using Spectre.Console;
 
-namespace N_m3u8DL_RE.Entity
+namespace N_m3u8DL_RE.Entity;
+
+internal class Mediainfo
 {
-    internal class Mediainfo
-    {
     public string? Id { get; set; }
     public string? Text { get; set; }
     public string? BaseInfo { get; set; }
@@ -29,5 +24,4 @@ namespace N_m3u8DL_RE.Entity
     {
         return "[steelblue]" + ToString().EscapeMarkup() + ((HDR && !DolbyVison) ? " [darkorange3_1][[HDR]][/]" : "") + (DolbyVison ? " [darkorange3_1][[DOVI]][/]" : "") + "[/]";
     }
-    }
 }

src/N_m3u8DL-RE/Entity/MuxOptions.cs

@@ -1,17 +1,12 @@
-using System;
+using N_m3u8DL_RE.Enum;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Entity
+namespace N_m3u8DL_RE.Entity;
+
+internal class MuxOptions
 {
-    internal class MuxOptions
-    {
     public bool UseMkvmerge { get; set; } = false;
-        public bool MuxToMp4 { get; set; } = false;
+    public MuxFormat MuxFormat { get; set; } = MuxFormat.MP4;
     public bool KeepFiles { get; set; } = false;
     public bool SkipSubtitle { get; set; } = false;
     public string? BinPath { get; set; }
-    }
 }

src/N_m3u8DL-RE/Entity/OutputFile.cs

@@ -1,19 +1,13 @@
 using N_m3u8DL_RE.Common.Enum;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Entity
+namespace N_m3u8DL_RE.Entity;
+
+internal class OutputFile
 {
-    internal class OutputFile
-    {
     public MediaType? MediaType { get; set; }
     public required int Index { get; set; }
     public required string FilePath { get; set; }
     public string? LangCode { get; set; }
     public string? Description { get; set; }
-        public List<Mediainfo> Mediainfos { get; set; } = new();
+    public List<Mediainfo> Mediainfos { get; set; } = [];
-    }
 }

src/N_m3u8DL-RE/Entity/SpeedContainer.cs

@@ -1,30 +1,21 @@
-using NiL.JS.Statements;
+namespace N_m3u8DL_RE.Entity;
-using System;
-using System.Collections.Generic;
-using System.ComponentModel;
-using System.Drawing;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Entity
+internal class SpeedContainer
 {
-    internal class SpeedContainer
-    {
     public bool SingleSegment { get; set; } = false;
-        public long NowSpeed { get; set; } = 0L; //当前每秒速度
+    public long NowSpeed { get; set; } = 0L; // 当前每秒速度
-        public long SpeedLimit { get; set; } = long.MaxValue; //限速设置
+    public long SpeedLimit { get; set; } = long.MaxValue; // 限速设置
     public long? ResponseLength { get; set; }
-        public long RDownloaded { get => _Rdownloaded; }
+    public long RDownloaded => _Rdownloaded;
     private int _zeroSpeedCount = 0;
-        public int LowSpeedCount { get => _zeroSpeedCount; }
+    public int LowSpeedCount => _zeroSpeedCount;
-        public bool ShouldStop { get => LowSpeedCount >= 20; }
+    public bool ShouldStop => LowSpeedCount >= 20;
 
     ///////////////////////////////////////////////////
 
     private long _downloaded = 0;
     private long _Rdownloaded = 0;
-        public long Downloaded { get => _downloaded; }
+    public long Downloaded => _downloaded;
 
     public int AddLowSpeedCount()
     {
@@ -55,5 +46,4 @@ namespace N_m3u8DL_RE.Entity
         ResponseLength = null;
         _Rdownloaded = 0L;
     }
-    }
 }

src/N_m3u8DL-RE/Entity/StreamFilter.cs

@@ -1,15 +1,11 @@
 using N_m3u8DL_RE.Common.Enum;
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Text;
 using System.Text.RegularExpressions;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Entity
+namespace N_m3u8DL_RE.Entity;
+
+public class StreamFilter
 {
-    public class StreamFilter
-    {
     public Regex? GroupIdReg { get; set; }
     public Regex? LanguageReg { get; set; }
     public Regex? NameReg { get; set; }
@@ -50,7 +46,6 @@ namespace N_m3u8DL_RE.Entity
         if (BandwidthMax != null) sb.Append($"{nameof(BandwidthMax)}: {BandwidthMax} ");
         if (Role.HasValue) sb.Append($"Role: {Role} ");
 
-            return sb.ToString() + $"For: {For}";
+        return sb + $"For: {For}";
-        }
     }
 }

src/N_m3u8DL-RE/Enum/DecryptEngine.cs

@@ -0,0 +1,8 @@
+namespace N_m3u8DL_RE.Enum;
+
+internal enum DecryptEngine
+{
+    MP4DECRYPT,
+    SHAKA_PACKAGER,
+    FFMPEG,
+}

src/N_m3u8DL-RE/Enum/MuxFormat.cs

@@ -0,0 +1,8 @@
+namespace N_m3u8DL_RE.Enum;
+
+internal enum MuxFormat
+{
+    MP4,
+    MKV,
+    TS,
+}

src/N_m3u8DL-RE/Enum/SubtitleFormat.cs

@@ -1,14 +1,7 @@
-using System;
+namespace N_m3u8DL_RE.Enum;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Enum
+internal enum SubtitleFormat
 {
-    internal enum SubtitleFormat
-    {
     VTT,
     SRT
-    }
 }

src/N_m3u8DL-RE/N_m3u8DL-RE.csproj

@@ -2,12 +2,12 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-	<TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <RootNamespace>N_m3u8DL_RE</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <LangVersion>preview</LangVersion>
     <Nullable>enable</Nullable>
-	<Version>0.2.1</Version>
+    <Version>0.3.0</Version>
     <Platforms>AnyCPU;x64</Platforms>
   </PropertyGroup>
 
@@ -16,7 +16,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="NiL.JS" Version="2.5.1600" />
+    <PackageReference Include="NiL.JS" Version="2.5.1684" />
     <PackageReference Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
   </ItemGroup>
 

src/N_m3u8DL-RE/Processor/DemoProcessor.cs

@@ -2,16 +2,11 @@
 using N_m3u8DL_RE.Common.Log;
 using N_m3u8DL_RE.Parser.Config;
 using N_m3u8DL_RE.Parser.Processor;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Processor
+namespace N_m3u8DL_RE.Processor;
+
+internal class DemoProcessor : ContentProcessor
 {
-    internal class DemoProcessor : ContentProcessor
-    {
 
     public override bool CanProcess(ExtractorType extractorType, string rawText, ParserConfig parserConfig)
     {
@@ -23,5 +18,4 @@ namespace N_m3u8DL_RE.Processor
         Logger.InfoMarkUp("[red]Match bitmovin![/]");
         return rawText;
     }
-    }
 }

src/N_m3u8DL-RE/Processor/DemoProcessor2.cs

@@ -5,16 +5,11 @@ using N_m3u8DL_RE.Common.Util;
 using N_m3u8DL_RE.Parser.Config;
 using N_m3u8DL_RE.Parser.Processor;
 using N_m3u8DL_RE.Parser.Processor.HLS;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Processor
+namespace N_m3u8DL_RE.Processor;
+
+internal class DemoProcessor2 : KeyProcessor
 {
-    internal class DemoProcessor2 : KeyProcessor
-    {
     public override bool CanProcess(ExtractorType extractorType, string keyLine, string m3u8Url, string m3u8Content, ParserConfig parserConfig)
     {
         return extractorType == ExtractorType.HLS  && parserConfig.Url.Contains("playertest.longtailvideo.com");
@@ -27,5 +22,4 @@ namespace N_m3u8DL_RE.Processor
         Logger.InfoMarkUp("[red]" + HexUtil.BytesToHex(info.Key!, " ") + "[/]");
         return info;
     }
-    }
 }

src/N_m3u8DL-RE/Processor/NowehoryzontyUrlProcessor.cs

@@ -6,19 +6,12 @@ using N_m3u8DL_RE.Parser.Util;
 using NiL.JS.BaseLibrary;
 using NiL.JS.Core;
 using NiL.JS.Extensions;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Security.Cryptography;
-using System.Text;
-using System.Text.RegularExpressions;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Processor
+namespace N_m3u8DL_RE.Processor;
+
+// "https://1429754964.rsc.cdn77.org/r/nh22/2022/VNUS_DE_NYKE/19_07_22_2302_skt/h264.mpd?secure=mSvVfvuciJt9wufUyzuBnA==,1658505709774" --urlprocessor-args "nowehoryzonty:timeDifference=-2274,filminfo.secureToken=vx54axqjal4f0yy2"
+internal class NowehoryzontyUrlProcessor : UrlProcessor
 {
-    //"https://1429754964.rsc.cdn77.org/r/nh22/2022/VNUS_DE_NYKE/19_07_22_2302_skt/h264.mpd?secure=mSvVfvuciJt9wufUyzuBnA==,1658505709774" --urlprocessor-args "nowehoryzonty:timeDifference=-2274,filminfo.secureToken=vx54axqjal4f0yy2"
-    internal class NowehoryzontyUrlProcessor : UrlProcessor
-    {
     private static string START = "nowehoryzonty:";
     private static string? TimeDifferenceStr = null;
     private static int? TimeDifference = null;
@@ -220,5 +213,4 @@ namespace N_m3u8DL_RE.Processor
                                         //console.log(md5('/r/nh22/2022/VNUS_DE_NYKE/19_07_22_2302_skt/subtitle_pl/34.m4s','vx54axqjal4f0yy2',-2274));
 
                                         """;
-    }
 }

src/N_m3u8DL-RE/Program.cs

@@ -1,11 +1,11 @@
-using N_m3u8DL_RE.Parser.Config;
+using System.Globalization;
+using N_m3u8DL_RE.Parser.Config;
 using N_m3u8DL_RE.Common.Entity;
 using N_m3u8DL_RE.Common.Enum;
 using N_m3u8DL_RE.Parser;
 using Spectre.Console;
 using N_m3u8DL_RE.Common.Resource;
 using N_m3u8DL_RE.Common.Log;
-using System.Globalization;
 using System.Text;
 using N_m3u8DL_RE.Common.Util;
 using N_m3u8DL_RE.Processor;
@@ -14,24 +14,34 @@ using N_m3u8DL_RE.Util;
 using N_m3u8DL_RE.DownloadManager;
 using N_m3u8DL_RE.CommandLine;
 using System.Net;
-using System.Net.Http.Headers;
+using N_m3u8DL_RE.Enum;
 
-namespace N_m3u8DL_RE
+namespace N_m3u8DL_RE;
+
+internal class Program
 {
-    internal class Program
-    {
     static async Task Main(string[] args)
     {
+        // 处理NT6.0及以下System.CommandLine报错CultureNotFound问题
+        if (OperatingSystem.IsWindows()) 
+        {
+            var osVersion = Environment.OSVersion.Version;
+            if (osVersion.Major < 6 || osVersion is { Major: 6, Minor: 0 })
+            {
+                Environment.SetEnvironmentVariable("DOTNET_SYSTEM_GLOBALIZATION_INVARIANT", "1");
+            }
+        }
+        
         Console.CancelKeyPress += Console_CancelKeyPress;
         ServicePointManager.DefaultConnectionLimit = 1024;
         try { Console.CursorVisible = true; } catch { }
 
-            string loc = "en-US";
+        string loc = ResString.CurrentLoc;
         string currLoc = Thread.CurrentThread.CurrentUICulture.Name;
-            if (currLoc == "zh-CN" || currLoc == "zh-SG") loc = "zh-CN";
+        if (currLoc is "zh-CN" or "zh-SG") loc = "zh-CN";
         else if (currLoc.StartsWith("zh-")) loc = "zh-TW";
 
-            //处理用户-h等请求
+        // 处理用户-h等请求
         var index = -1;
         var list = new List<string>(args);
         if ((index = list.IndexOf("--ui-language")) != -1 && list.Count > index + 1 && new List<string> { "en-US", "zh-CN", "zh-TW" }.Contains(list[index + 1]))
@@ -39,10 +49,18 @@ namespace N_m3u8DL_RE
             loc = list[index + 1];
         }
         
+        ResString.CurrentLoc = loc;
+
+        try
+        {
             CultureInfo.DefaultThreadCurrentCulture = new CultureInfo(loc);
             Thread.CurrentThread.CurrentUICulture = CultureInfo.GetCultureInfo(loc);
             Thread.CurrentThread.CurrentCulture = CultureInfo.GetCultureInfo(loc);
-
+        }
+        catch 
+        {
+            // Culture not work on NT6.0, so catch the exception
+        }
 
         await CommandInvoker.InvokeArgs(args, DoWorkAsync);
     }
@@ -54,7 +72,7 @@ namespace N_m3u8DL_RE
         { 
             Console.CursorVisible = true;
             if (!OperatingSystem.IsWindows())
-                    System.Diagnostics.Process.Start("stty", "echo");
+                System.Diagnostics.Process.Start("tput", "cnorm");
         } catch { }
         Environment.Exit(0);
     }
@@ -69,7 +87,7 @@ namespace N_m3u8DL_RE
 
     static async Task DoWorkAsync(MyOption option)
     {
-            
+        HTTPUtil.AppHttpClient.Timeout = TimeSpan.FromSeconds(option.HttpRequestTimeout);
         if (Console.IsOutputRedirected || Console.IsErrorRedirected)
         {
             option.ForceAnsiConsole = true;
@@ -77,8 +95,10 @@ namespace N_m3u8DL_RE
             Logger.Info(ResString.consoleRedirected);
         }
         CustomAnsiConsole.InitConsole(option.ForceAnsiConsole, option.NoAnsiColor);
-            //检测更新
+        
-            CheckUpdateAsync();
+        // 检测更新
+        if (!option.DisableUpdateCheck)
+            _ = CheckUpdateAsync();
 
         Logger.IsWriteFile = !option.NoLog;
         Logger.InitLogFile();
@@ -96,23 +116,26 @@ namespace N_m3u8DL_RE
             HTTPUtil.HttpClientHandler.UseProxy = true;
         }
 
-            //检查互斥的选项
+        // 检查互斥的选项
-
+        if (option is { MuxAfterDone: false, MuxImports.Count: > 0 })
-            if (!option.MuxAfterDone && option.MuxImports != null && option.MuxImports.Count > 0)
         {
             throw new ArgumentException("MuxAfterDone disabled, MuxImports not allowed!");
         }
 
-            //LivePipeMux开启时 LiveRealTimeMerge必须开启
+        if (option.UseShakaPackager) 
-            if (option.LivePipeMux && !option.LiveRealTimeMerge)
+        {
+            option.DecryptionEngine = DecryptEngine.SHAKA_PACKAGER;
+        }
+
+        // LivePipeMux开启时 LiveRealTimeMerge必须开启
+        if (option is { LivePipeMux: true, LiveRealTimeMerge: false })
         {
             Logger.WarnMarkUp("LivePipeMux detected, forced enable LiveRealTimeMerge");
             option.LiveRealTimeMerge = true;
         }
 
-            //预先检查ffmpeg
+        // 预先检查ffmpeg
-            if (option.FFmpegBinaryPath == null)
+        option.FFmpegBinaryPath ??= GlobalUtil.FindExecutable("ffmpeg");
-                option.FFmpegBinaryPath = GlobalUtil.FindExecutable("ffmpeg");
 
         if (string.IsNullOrEmpty(option.FFmpegBinaryPath) || !File.Exists(option.FFmpegBinaryPath))
         {
@@ -121,53 +144,59 @@ namespace N_m3u8DL_RE
 
         Logger.Extra($"ffmpeg => {option.FFmpegBinaryPath}");
 
-            //预先检查mkvmerge
+        // 预先检查mkvmerge
-            if (option.MuxOptions != null && option.MuxOptions.UseMkvmerge && option.MuxAfterDone)
+        if (option is { MuxOptions.UseMkvmerge: true, MuxAfterDone: true })
         {
-                if (option.MkvmergeBinaryPath == null)
+            option.MkvmergeBinaryPath ??= GlobalUtil.FindExecutable("mkvmerge");
-                    option.MkvmergeBinaryPath = GlobalUtil.FindExecutable("mkvmerge");
             if (string.IsNullOrEmpty(option.MkvmergeBinaryPath) || !File.Exists(option.MkvmergeBinaryPath))
             {
-                    throw new FileNotFoundException("mkvmerge not found");
+                throw new FileNotFoundException(ResString.mkvmergeNotFound);
             }
             Logger.Extra($"mkvmerge => {option.MkvmergeBinaryPath}");
         }
 
-            //预先检查
+        // 预先检查
-            if ((option.Keys != null && option.Keys.Length > 0) || option.KeyTextFile != null)
+        if (option.Keys is { Length: > 0 } || option.KeyTextFile != null)
         {
-                if (string.IsNullOrEmpty(option.DecryptionBinaryPath))
+            if (!string.IsNullOrEmpty(option.DecryptionBinaryPath) && !File.Exists(option.DecryptionBinaryPath))
             {
-                    if (option.UseShakaPackager)
+                throw new FileNotFoundException(option.DecryptionBinaryPath);
+            }
+            switch (option.DecryptionEngine)
+            {
+                case DecryptEngine.SHAKA_PACKAGER:
                 {
                     var file = GlobalUtil.FindExecutable("shaka-packager");
                     var file2 = GlobalUtil.FindExecutable("packager-linux-x64");
                     var file3 = GlobalUtil.FindExecutable("packager-osx-x64");
                     var file4 = GlobalUtil.FindExecutable("packager-win-x64");
-                        if (file == null && file2 == null && file3 == null && file4 == null) throw new FileNotFoundException("shaka-packager not found!");
+                    if (file == null && file2 == null && file3 == null && file4 == null)
+                        throw new FileNotFoundException(ResString.shakaPackagerNotFound);
                     option.DecryptionBinaryPath = file ?? file2 ?? file3 ?? file4;
                     Logger.Extra($"shaka-packager => {option.DecryptionBinaryPath}");
+                    break;
                 }
-                    else
+                case DecryptEngine.MP4DECRYPT:
                 {
                     var file = GlobalUtil.FindExecutable("mp4decrypt");
-                        if (file == null) throw new FileNotFoundException("mp4decrypt not found!");
+                    if (file == null) throw new FileNotFoundException(ResString.mp4decryptNotFound);
                     option.DecryptionBinaryPath = file;
                     Logger.Extra($"mp4decrypt => {option.DecryptionBinaryPath}");
+                    break;
                 }
-                }
+                case DecryptEngine.FFMPEG:
-                else if (!File.Exists(option.DecryptionBinaryPath))
+                default:
-                {
+                    option.DecryptionBinaryPath = option.FFmpegBinaryPath;
-                    throw new FileNotFoundException(option.DecryptionBinaryPath);
+                    break;
             }
         }
 
-            //默认的headers
+        // 默认的headers
         var headers = new Dictionary<string, string>()
         {
             ["user-agent"] = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36"
         };
-            //添加或替换用户输入的headers
+        // 添加或替换用户输入的headers
         foreach (var item in option.Headers)
         {
             headers[item.Key] = item.Value;
@@ -185,14 +214,19 @@ namespace N_m3u8DL_RE
             CustomeIV = option.CustomHLSIv,
         };
 
-            //demo1
+        if (option.AllowHlsMultiExtMap)
+        {
+            parserConfig.CustomParserArgs.Add("AllowHlsMultiExtMap", "true");
+        }
+
+        // demo1
         parserConfig.ContentProcessors.Insert(0, new DemoProcessor());
-            //demo2
+        // demo2
         parserConfig.KeyProcessors.Insert(0, new DemoProcessor2());
-            //for www.nowehoryzonty.pl
+        // for www.nowehoryzonty.pl
         parserConfig.UrlProcessors.Insert(0, new NowehoryzontyUrlProcessor());
 
-            //等待任务开始时间
+        // 等待任务开始时间
         if (option.TaskStartAt != null && option.TaskStartAt > DateTime.Now)
         {
             Logger.InfoMarkUp(ResString.taskStartAt + option.TaskStartAt);
@@ -204,7 +238,7 @@ namespace N_m3u8DL_RE
 
         var url = option.Input;
 
-            //流提取器配置
+        // 流提取器配置
         var extractor = new StreamExtractor(parserConfig);
         // 从链接加载内容
         await RetryUtil.WebRequestRetryAsync(async () =>
@@ -212,33 +246,33 @@ namespace N_m3u8DL_RE
             await extractor.LoadSourceFromUrlAsync(url);
             return true;
         });
-            //解析流信息
+        // 解析流信息
         var streams = await extractor.ExtractStreamsAsync();
 
 
-            //全部媒体
+        // 全部媒体
-            var lists = streams.OrderBy(p => p.MediaType).ThenByDescending(p => p.Bandwidth).ThenByDescending(GetOrder);
+        var lists = streams.OrderBy(p => p.MediaType).ThenByDescending(p => p.Bandwidth).ThenByDescending(GetOrder).ToList();
-            //基本流
+        // 基本流
-            var basicStreams = lists.Where(x => x.MediaType == null || x.MediaType == MediaType.VIDEO);
+        var basicStreams = lists.Where(x => x.MediaType is null or MediaType.VIDEO).ToList();
-            //可选音频轨道
+        // 可选音频轨道
-            var audios = lists.Where(x => x.MediaType == MediaType.AUDIO);
+        var audios = lists.Where(x => x.MediaType == MediaType.AUDIO).ToList();
-            //可选字幕轨道
+        // 可选字幕轨道
-            var subs = lists.Where(x => x.MediaType == MediaType.SUBTITLES);
+        var subs = lists.Where(x => x.MediaType == MediaType.SUBTITLES).ToList();
 
-            //尝试从URL或文件读取文件名
+        // 尝试从URL或文件读取文件名
         if (string.IsNullOrEmpty(option.SaveName))
         {
             option.SaveName = OtherUtil.GetFileNameFromInput(option.Input);
         }
 
-            //生成文件夹
+        // 生成文件夹
         var tmpDir = Path.Combine(option.TmpDir ?? Environment.CurrentDirectory, $"{option.SaveName ?? DateTime.Now.ToString("yyyy-MM-dd_HH-mm-ss")}");
-            //记录文件
+        // 记录文件
         extractor.RawFiles["meta.json"] = GlobalUtil.ConvertToJson(lists);
-            //写出文件
+        // 写出文件
         await WriteRawFilesAsync(option, extractor, tmpDir);
 
-            Logger.Info(ResString.streamsInfo, lists.Count(), basicStreams.Count(), audios.Count(), subs.Count());
+        Logger.Info(ResString.streamsInfo, lists.Count, basicStreams.Count, audios.Count, subs.Count);
 
         foreach (var item in lists)
         {
@@ -251,7 +285,7 @@ namespace N_m3u8DL_RE
             basicStreams = FilterUtil.DoFilterDrop(basicStreams, option.DropVideoFilter);
             audios = FilterUtil.DoFilterDrop(audios, option.DropAudioFilter);
             subs = FilterUtil.DoFilterDrop(subs, option.DropSubtitleFilter);
-                lists = basicStreams.Concat(audios).Concat(subs).OrderBy(x => true);
+            lists = basicStreams.Concat(audios).Concat(subs).ToList();
         }
 
         if (option.DropVideoFilter != null) Logger.Extra($"DropVideoFilter => {option.DropVideoFilter}");
@@ -263,7 +297,7 @@ namespace N_m3u8DL_RE
 
         if (option.AutoSelect)
         {
-                if (basicStreams.Any())
+            if (basicStreams.Count != 0)
                 selectedStreams.Add(basicStreams.First());
             var langs = audios.DistinctBy(a => a.Language).Select(a => a.Language);
             foreach (var lang in langs)
@@ -285,40 +319,40 @@ namespace N_m3u8DL_RE
         }
         else
         {
-                //展示交互式选择框
+            // 展示交互式选择框
             selectedStreams = FilterUtil.SelectStreams(lists);
         }
 
-            if (!selectedStreams.Any())
+        if (selectedStreams.Count == 0)
             throw new Exception(ResString.noStreamsToDownload);
 
-            //HLS: 选中流中若有没加载出playlist的，加载playlist
+        // HLS: 选中流中若有没加载出playlist的，加载playlist
-            //DASH/MSS: 加载playlist (调用url预处理器)
+        // DASH/MSS: 加载playlist (调用url预处理器)
         if (selectedStreams.Any(s => s.Playlist == null) || extractor.ExtractorType == ExtractorType.MPEG_DASH || extractor.ExtractorType == ExtractorType.MSS)
             await extractor.FetchPlayListAsync(selectedStreams);
 
-            //直播检测
+        // 直播检测
         var livingFlag = selectedStreams.Any(s => s.Playlist?.IsLive == true) && !option.LivePerformAsVod;
         if (livingFlag)
         {
             Logger.WarnMarkUp($"[white on darkorange3_1]{ResString.liveFound}[/]");
         }
 
-            //无法识别的加密方式，自动开启二进制合并
+        // 无法识别的加密方式，自动开启二进制合并
-            if (selectedStreams.Any(s => s.Playlist.MediaParts.Any(p => p.MediaSegments.Any(m => m.EncryptInfo.Method == EncryptMethod.UNKNOWN))))
+        if (selectedStreams.Any(s => s.Playlist!.MediaParts.Any(p => p.MediaSegments.Any(m => m.EncryptInfo.Method == EncryptMethod.UNKNOWN))))
         {
             Logger.WarnMarkUp($"[darkorange3_1]{ResString.autoBinaryMerge3}[/]");
             option.BinaryMerge = true;
         }
 
-            //应用用户自定义的分片范围
+        // 应用用户自定义的分片范围
         if (!livingFlag)
             FilterUtil.ApplyCustomRange(selectedStreams, option.CustomRange);
 
-            //应用用户自定义的广告分片关键字
+        // 应用用户自定义的广告分片关键字
         FilterUtil.CleanAd(selectedStreams, option.AdKeywords);
 
-            //记录文件
+        // 记录文件
         extractor.RawFiles["meta_selected.json"] = GlobalUtil.ConvertToJson(selectedStreams);
 
         Logger.Info(ResString.selectedStream);
@@ -327,7 +361,7 @@ namespace N_m3u8DL_RE
             Logger.InfoMarkUp(item.ToString());
         }
 
-            //写出文件
+        // 写出文件
         await WriteRawFilesAsync(option, extractor, tmpDir);
 
         if (option.SkipDownload)
@@ -342,19 +376,19 @@ namespace N_m3u8DL_RE
 
         Logger.InfoMarkUp(ResString.saveName + $"[deepskyblue1]{option.SaveName.EscapeMarkup()}[/]");
 
-            //开始MuxAfterDone后自动使用二进制版
+        // 开始MuxAfterDone后自动使用二进制版
-            if (!option.BinaryMerge && option.MuxAfterDone)
+        if (option is { BinaryMerge: false, MuxAfterDone: true })
         {
             option.BinaryMerge = true;
             Logger.WarnMarkUp($"[darkorange3_1]{ResString.autoBinaryMerge6}[/]");
         }
 
-            //下载配置
+        // 下载配置
         var downloadConfig = new DownloaderConfig()
         {
             MyOptions = option,
             DirPrefix = tmpDir,
-                Headers = parserConfig.Headers, //使用命令行解析得到的Headers
+            Headers = parserConfig.Headers, // 使用命令行解析得到的Headers
         };
 
         var result = false;
@@ -366,7 +400,7 @@ namespace N_m3u8DL_RE
         }
         else if (!livingFlag)
         {
-                //开始下载
+            // 开始下载
             var sdm = new SimpleDownloadManager(downloadConfig, selectedStreams, extractor);
             result = await sdm.StartDownloadAsync();
         }
@@ -389,7 +423,7 @@ namespace N_m3u8DL_RE
 
     private static async Task WriteRawFilesAsync(MyOption option, StreamExtractor extractor, string tmpDir)
     {
-            //写出json文件
+        // 写出json文件
         if (option.WriteMetaJson)
         {
             if (!Directory.Exists(tmpDir)) Directory.CreateDirectory(tmpDir);
@@ -422,31 +456,27 @@ namespace N_m3u8DL_RE
         }
     }
 
-        //重定向
+    // 重定向
     static async Task<string> Get302Async(string url)
     {
-            //this allows you to set the settings so that we can get the redirect url
+        // this allows you to set the settings so that we can get the redirect url
-            var handler = new HttpClientHandler()
+        var handler = new HttpClientHandler
         {
             AllowAutoRedirect = false
         };
-            string redirectedUrl = "";
+        var redirectedUrl = "";
-            using (HttpClient client = new(handler))
+        using var client = new HttpClient(handler);
-            using (HttpResponseMessage response = await client.GetAsync(url))
+        using var response = await client.GetAsync(url);
-            using (HttpContent content = response.Content)
+        using var content = response.Content;
-            {
         // ... Read the response to see if we have the redirected url
-                if (response.StatusCode == System.Net.HttpStatusCode.Found)
+        if (response.StatusCode != HttpStatusCode.Found) return redirectedUrl;
-                {
+        
-                    HttpResponseHeaders headers = response.Headers;
+        var headers = response.Headers;
-                    if (headers != null && headers.Location != null)
+        if (headers.Location != null)
         {
             redirectedUrl = headers.Location.AbsoluteUri;
         }
-                }
-            }
 
         return redirectedUrl;
     }
-    }
 }

src/N_m3u8DL-RE/Util/DownloadUtil.cs

@@ -2,14 +2,12 @@
 using N_m3u8DL_RE.Common.Resource;
 using N_m3u8DL_RE.Common.Util;
 using N_m3u8DL_RE.Entity;
-using System.IO;
-using System.Net;
 using System.Net.Http.Headers;
 
-namespace N_m3u8DL_RE.Util
+namespace N_m3u8DL_RE.Util;
+
+internal static class DownloadUtil
 {
-    internal class DownloadUtil
-    {
     private static readonly HttpClient AppHttpClient = HTTPUtil.AppHttpClient;
 
     private static async Task<DownloadResult> CopyFileAsync(string sourceFile, string path, SpeedContainer speedContainer, long? fromPosition = null, long? toPosition = null)
@@ -26,8 +24,8 @@ namespace N_m3u8DL_RE.Util
         else
         {
             var buffer = new byte[expect];
-                await inputStream.ReadAsync(buffer);
+            _ = await inputStream.ReadAsync(buffer);
-                await outputStream.WriteAsync(buffer, 0, buffer.Length);
+            await outputStream.WriteAsync(buffer);
             speedContainer.Add(buffer.Length);
         }
         return new DownloadResult()
@@ -83,7 +81,7 @@ namespace N_m3u8DL_RE.Util
             {
                 HttpResponseHeaders respHeaders = response.Headers;
                 Logger.Debug(respHeaders.ToString());
-                    if (respHeaders != null && respHeaders.Location != null)
+                if (respHeaders.Location != null)
                 {
                     var redirectedUrl = "";
                     if (!respHeaders.Location.IsAbsoluteUri)
@@ -110,17 +108,17 @@ namespace N_m3u8DL_RE.Util
 
             size = await responseStream.ReadAsync(buffer, cancellationTokenSource.Token);
             speedContainer.Add(size);
-                await stream.WriteAsync(buffer, 0, size);
+            await stream.WriteAsync(buffer.AsMemory(0, size));
-                //检测imageHeader
+            // 检测imageHeader
             bool imageHeader = ImageHeaderUtil.IsImageHeader(buffer);
-                //检测GZip（For DDP Audio）
+            // 检测GZip（For DDP Audio）
             bool gZipHeader = buffer.Length > 2 && buffer[0] == 0x1f && buffer[1] == 0x8b;
 
             while ((size = await responseStream.ReadAsync(buffer, cancellationTokenSource.Token)) > 0)
             {
                 speedContainer.Add(size);
-                    await stream.WriteAsync(buffer, 0, size);
+                await stream.WriteAsync(buffer.AsMemory(0, size));
-                    //限速策略
+                // 限速策略
                 while (speedContainer.Downloaded > speedContainer.SpeedLimit)
                 {
                     await Task.Delay(1);
@@ -142,5 +140,4 @@ namespace N_m3u8DL_RE.Util
             throw new Exception("Download speed too slow!");
         }
     }
-    }
 }

src/N_m3u8DL-RE/Util/FilterUtil.cs

@@ -4,20 +4,15 @@ using N_m3u8DL_RE.Common.Log;
 using N_m3u8DL_RE.Common.Resource;
 using N_m3u8DL_RE.Entity;
 using Spectre.Console;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 using System.Text.RegularExpressions;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Util
+namespace N_m3u8DL_RE.Util;
+
+public static class FilterUtil
 {
-    public class FilterUtil
-    {
     public static List<StreamSpec> DoFilterKeep(IEnumerable<StreamSpec> lists, StreamFilter? filter)
     {
-            if (filter == null) return new List<StreamSpec>();
+        if (filter == null) return [];
 
         var inputs = lists.Where(_ => true);
         if (filter.GroupIdReg != null)
@@ -56,13 +51,13 @@ namespace N_m3u8DL_RE.Util
         var bestNumberStr = filter.For.Replace("best", "");
         var worstNumberStr = filter.For.Replace("worst", "");
 
-            if (filter.For == "best" && inputs.Count() > 0)
+        if (filter.For == "best" && inputs.Any())
             inputs = inputs.Take(1).ToList();
-            else if (filter.For == "worst" && inputs.Count() > 0)
+        else if (filter.For == "worst" && inputs.Any())
             inputs = inputs.TakeLast(1).ToList();
-            else if (int.TryParse(bestNumberStr, out int bestNumber) && inputs.Count() > 0)
+        else if (int.TryParse(bestNumberStr, out int bestNumber) && inputs.Any())
             inputs = inputs.Take(bestNumber).ToList();
-            else if (int.TryParse(worstNumberStr, out int worstNumber) && inputs.Count() > 0)
+        else if (int.TryParse(worstNumberStr, out int worstNumber) && inputs.Any())
             inputs = inputs.TakeLast(worstNumber).ToList();
 
         return inputs.ToList();
@@ -70,7 +65,7 @@ namespace N_m3u8DL_RE.Util
 
     public static List<StreamSpec> DoFilterDrop(IEnumerable<StreamSpec> lists, StreamFilter? filter)
     {
-            if (filter == null) return new List<StreamSpec>(lists);
+        if (filter == null) return [..lists];
 
         var inputs = lists.Where(_ => true);
         var selected = DoFilterKeep(lists, filter);
@@ -82,23 +77,23 @@ namespace N_m3u8DL_RE.Util
 
     public static List<StreamSpec> SelectStreams(IEnumerable<StreamSpec> lists)
     {
-            if (lists.Count() == 1)
+        var streamSpecs = lists.ToList();
-                return new List<StreamSpec>(lists);
+        if (streamSpecs.Count == 1)
+            return [..streamSpecs];
 
-            //基本流
+        // 基本流
-            var basicStreams = lists.Where(x => x.MediaType == null);
+        var basicStreams = streamSpecs.Where(x => x.MediaType == null).ToList();
-            //可选音频轨道
+        // 可选音频轨道
-            var audios = lists.Where(x => x.MediaType == MediaType.AUDIO);
+        var audios = streamSpecs.Where(x => x.MediaType == MediaType.AUDIO).ToList();
-            //可选字幕轨道
+        // 可选字幕轨道
-            var subs = lists.Where(x => x.MediaType == MediaType.SUBTITLES);
+        var subs = streamSpecs.Where(x => x.MediaType == MediaType.SUBTITLES).ToList();
 
         var prompt = new MultiSelectionPrompt<StreamSpec>()
                 .Title(ResString.promptTitle)
                 .UseConverter(x =>
                 {
                     if (x.Name != null && x.Name.StartsWith("__"))
-                                return $"[darkslategray1]{x.Name.Substring(2)}[/]";
+                        return $"[darkslategray1]{x.Name[2..]}[/]";
-                            else
                     return x.ToString().EscapeMarkup().RemoveMarkup();
                 })
                 .Required()
@@ -107,38 +102,38 @@ namespace N_m3u8DL_RE.Util
                 .InstructionsText(ResString.promptInfo)
             ;
 
-            //默认选中第一个
+        // 默认选中第一个
-            var first = lists.First();
+        var first = streamSpecs.First();
         prompt.Select(first);
 
-            if (basicStreams.Any())
+        if (basicStreams.Count != 0)
         {
             prompt.AddChoiceGroup(new StreamSpec() { Name = "__Basic" }, basicStreams);
         }
 
-            if (audios.Any())
+        if (audios.Count != 0)
         {
             prompt.AddChoiceGroup(new StreamSpec() { Name = "__Audio" }, audios);
-                //默认音轨
+            // 默认音轨
             if (first.AudioId != null)
             {
                 prompt.Select(audios.First(a => a.GroupId == first.AudioId));
             }
         }
-            if (subs.Any())
+        if (subs.Count != 0)
         {
             prompt.AddChoiceGroup(new StreamSpec() { Name = "__Subtitle" }, subs);
-                //默认字幕轨
+            // 默认字幕轨
             if (first.SubtitleId != null)
             {
                 prompt.Select(subs.First(s => s.GroupId == first.SubtitleId));
             }
         }
 
-            //如果此时还是没有选中任何流，自动选择一个
+        // 如果此时还是没有选中任何流，自动选择一个
         prompt.Select(basicStreams.Concat(audios).Concat(subs).First());
 
-            //多选
+        // 多选
         var selectedStreams = CustomAnsiConsole.Console.Prompt(prompt);
 
         return selectedStreams;
@@ -147,11 +142,11 @@ namespace N_m3u8DL_RE.Util
     /// <summary>
     /// 直播使用。对齐各个轨道的起始。
     /// </summary>
-        /// <param name="streams"></param>
+    /// <param name="selectedSteams"></param>
     /// <param name="takeLastCount"></param>
     public static void SyncStreams(List<StreamSpec> selectedSteams, int takeLastCount = 15)
     {
-            //通过Date同步
+        // 通过Date同步
         if (selectedSteams.All(x => x.Playlist!.MediaParts[0].MediaSegments.All(x => x.DateTime != null)))
         {
             var minDate = selectedSteams.Max(s => s.Playlist!.MediaParts[0].MediaSegments.Min(s => s.DateTime))!;
@@ -159,12 +154,12 @@ namespace N_m3u8DL_RE.Util
             {
                 foreach (var part in item.Playlist!.MediaParts)
                 {
-                        //秒级同步 忽略毫秒
+                    // 秒级同步 忽略毫秒
                     part.MediaSegments = part.MediaSegments.Where(s => s.DateTime!.Value.Ticks / TimeSpan.TicksPerSecond >= minDate.Value.Ticks / TimeSpan.TicksPerSecond).ToList();
                 }
             }
         }
-            else //通过index同步
+        else // 通过index同步
         {
             var minIndex = selectedSteams.Max(s => s.Playlist!.MediaParts[0].MediaSegments.Min(s => s.Index));
             foreach (var item in selectedSteams)
@@ -176,7 +171,7 @@ namespace N_m3u8DL_RE.Util
             }
         }
 
-            //取最新的N个分片
+        // 取最新的N个分片
         if (selectedSteams.Any(x => x.Playlist!.MediaParts[0].MediaSegments.Count > takeLastCount))
         {
             var skipCount = selectedSteams.Min(x => x.Playlist!.MediaParts[0].MediaSegments.Count) - takeLastCount + 1;
@@ -198,17 +193,15 @@ namespace N_m3u8DL_RE.Util
     /// <param name="customRange"></param>
     public static void ApplyCustomRange(List<StreamSpec> selectedSteams, CustomRange? customRange)
     {
-            var resultList = selectedSteams.Select(x => 0d).ToList();
-
         if (customRange == null) return;
 
         Logger.InfoMarkUp($"{ResString.customRangeFound}[Cyan underline]{customRange.InputStr}[/]");
         Logger.WarnMarkUp($"[darkorange3_1]{ResString.customRangeWarn}[/]");
 
-            var filteByIndex = customRange.StartSegIndex != null && customRange.EndSegIndex != null;
+        var filterByIndex = customRange is { StartSegIndex: not null, EndSegIndex: not null };
-            var filteByTime = customRange.StartSec != null && customRange.EndSec != null;
+        var filterByTime = customRange is { StartSec: not null, EndSec: not null };
 
-            if (!filteByIndex && !filteByTime)
+        if (!filterByIndex && !filterByTime)
         {
             Logger.ErrorMarkUp(ResString.customRangeInvalid);
             return;
@@ -220,8 +213,8 @@ namespace N_m3u8DL_RE.Util
             if (stream.Playlist == null) continue;
             foreach (var part in stream.Playlist.MediaParts)
             {
-                    var newSegments = new List<MediaSegment>();
+                List<MediaSegment> newSegments;
-                    if (filteByIndex)
+                if (filterByIndex)
                     newSegments = part.MediaSegments.Where(seg => seg.Index >= customRange.StartSegIndex && seg.Index <= customRange.EndSegIndex).ToList();
                 else
                     newSegments = part.MediaSegments.Where(seg => stream.Playlist.MediaParts.SelectMany(p => p.MediaSegments).Where(x => x.Index < seg.Index).Sum(x => x.Duration) >= customRange.StartSec
@@ -239,11 +232,11 @@ namespace N_m3u8DL_RE.Util
     /// 根据用户输入，清除广告分片
     /// </summary>
     /// <param name="selectedSteams"></param>
-        /// <param name="customRange"></param>
+    /// <param name="keywords"></param>
     public static void CleanAd(List<StreamSpec> selectedSteams, string[]? keywords)
     {
         if (keywords == null) return;
-            var regList = keywords.Select(s => new Regex(s));
+        var regList = keywords.Select(s => new Regex(s)).ToList();
         foreach ( var reg in regList)
         {
             Logger.InfoMarkUp($"{ResString.customAdKeywordsFound}[Cyan underline]{reg}[/]");
@@ -257,19 +250,16 @@ namespace N_m3u8DL_RE.Util
 
             foreach (var part in stream.Playlist.MediaParts)
             {
-                    //没有找到广告分片
+                // 没有找到广告分片
                 if (part.MediaSegments.All(x => regList.All(reg => !reg.IsMatch(x.Url))))
                 {
                     continue;
                 }
-                    //找到广告分片 清理
+                // 找到广告分片 清理
-                    else
-                    {
                 part.MediaSegments = part.MediaSegments.Where(x => regList.All(reg => !reg.IsMatch(x.Url))).ToList();
             }
-                }
 
-                //清理已经为空的 part
+            // 清理已经为空的 part
             stream.Playlist.MediaParts = stream.Playlist.MediaParts.Where(x => x.MediaSegments.Count > 0).ToList();
 
             var countAfter = stream.SegmentsCount;
@@ -280,5 +270,4 @@ namespace N_m3u8DL_RE.Util
             }
         }
     }
-    }
 }

src/N_m3u8DL-RE/Util/ImageHeaderUtil.cs

@@ -1,28 +1,21 @@
-using System;
+namespace N_m3u8DL_RE.Util;
-using System.Collections.Generic;
-using System.Drawing;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Util
+internal static class ImageHeaderUtil
 {
-    internal class ImageHeaderUtil
-    {
     public static bool IsImageHeader(byte[] bArr)
     {
         var size = bArr.Length;
-            //PNG HEADER检测
+        // PNG HEADER检测
         if (size > 3 && 137 == bArr[0] && 80 == bArr[1] && 78 == bArr[2] && 71 == bArr[3])
             return true;
-            //GIF HEADER检测
+        // GIF HEADER检测
-            else if (size > 3 && 0x47 == bArr[0] && 0x49 == bArr[1] && 0x46 == bArr[2] && 0x38 == bArr[3])
+        if (size > 3 && 0x47 == bArr[0] && 0x49 == bArr[1] && 0x46 == bArr[2] && 0x38 == bArr[3])
             return true;
-            //BMP HEADER检测
+        // BMP HEADER检测
-            else if (size > 10 && 0x42 == bArr[0] && 0x4D == bArr[1] && 0x00 == bArr[5] && 0x00 == bArr[6] && 0x00 == bArr[7] && 0x00 == bArr[8])
+        if (size > 10 && 0x42 == bArr[0] && 0x4D == bArr[1] && 0x00 == bArr[5] && 0x00 == bArr[6] && 0x00 == bArr[7] && 0x00 == bArr[8])
             return true;
-            //JPEG HEADER检测
+        // JPEG HEADER检测
-            else if (size > 3 && 0xFF == bArr[0] && 0xD8 == bArr[1] && 0xFF == bArr[2])
+        if (size > 3 && 0xFF == bArr[0] && 0xD8 == bArr[1] && 0xFF == bArr[2])
             return true;
         return false;
     }
@@ -31,7 +24,7 @@ namespace N_m3u8DL_RE.Util
     {
         var sourceData = await File.ReadAllBytesAsync(sourcePath);
 
-            //PNG HEADER
+        // PNG HEADER
         if (137 == sourceData[0] && 80 == sourceData[1] && 78 == sourceData[2] && 71 == sourceData[3])
         {
             if (sourceData.Length > 120 && 137 == sourceData[0] && 80 == sourceData[1] && 78 == sourceData[2] && 71 == sourceData[3] && 96 == sourceData[118] && 130 == sourceData[119])
@@ -44,7 +37,7 @@ namespace N_m3u8DL_RE.Util
                 sourceData = sourceData[771..];
             else
             {
-                    //手动查询结尾标记 0x47 出现两次
+                // 手动查询结尾标记 0x47 出现两次
                 int skip = 0;
                 for (int i = 4; i < sourceData.Length - 188 * 2 - 4; i++)
                 {
@@ -57,20 +50,20 @@ namespace N_m3u8DL_RE.Util
                 sourceData = sourceData[skip..];
             }
         }
-            //GIF HEADER
+        // GIF HEADER
         else if (0x47 == sourceData[0] && 0x49 == sourceData[1] && 0x46 == sourceData[2] && 0x38 == sourceData[3])
         {
             sourceData = sourceData[42..];
         }
-            //BMP HEADER
+        // BMP HEADER
         else if (0x42 == sourceData[0] && 0x4D == sourceData[1] && 0x00 == sourceData[5] && 0x00 == sourceData[6] && 0x00 == sourceData[7] && 0x00 == sourceData[8])
         {
             sourceData = sourceData[0x3E..];
         }
-            //JPEG HEADER检测
+        // JPEG HEADER检测
         else if (0xFF == sourceData[0] && 0xD8 == sourceData[1] && 0xFF == sourceData[2])
         {
-                //手动查询结尾标记 0x47 出现两次
+            // 手动查询结尾标记 0x47 出现两次
             int skip = 0;
             for (int i = 4; i < sourceData.Length - 188 * 2 - 4; i++)
             {
@@ -85,5 +78,4 @@ namespace N_m3u8DL_RE.Util
 
         await File.WriteAllBytesAsync(sourcePath, sourceData);
     }
-    }
 }

src/N_m3u8DL-RE/Util/LanguageCodeUtil.cs

@@ -1,34 +1,20 @@
 using N_m3u8DL_RE.Entity;
-using System;
-using System.Collections.Generic;
-using System.Globalization;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Util
+namespace N_m3u8DL_RE.Util;
+
+internal class Language(string extendCode, string code, string desc, string descA)
 {
-    class Language
+    public readonly string Code = code;
-    {
+    public readonly string ExtendCode = extendCode;
-        public string Code;
+    public readonly string Description = desc;
-        public string ExtendCode;
+    public readonly string DescriptionAudio = descA;
-        public string Description;
+}
-        public string DescriptionAudio;
 
-        public Language(string extendCode, string code, string desc, string descA)
+internal static class LanguageCodeUtil
-        {
+{
-            Code = code;
-            ExtendCode = extendCode;
-            Description = desc;
-            DescriptionAudio = descA;
-        }
-    }
 
-    internal class LanguageCodeUtil
+    private static readonly List<Language> ALL_LANGS = @"
-    {
+default;und;default;default
-        private LanguageCodeUtil() { }
-
-        private readonly static List<Language> ALL_LANGS = @"
 af;afr;Afrikaans;Afrikaans
 af-ZA;afr;Afrikaans (South Africa);Afrikaans (South Africa)
 am;amh;Amharic;Amharic
@@ -388,11 +374,11 @@ CC;chi;中文（繁體）;中文
 CZ;chi;中文（简体）;中文
 MA;msa;Melayu;Melayu
 "
-.Trim().Replace("\r", "").Split('\n').Where(x => !string.IsNullOrWhiteSpace(x)).Select(x =>
+        .Trim().Replace("\r", "").Split('\n').Where(x => !string.IsNullOrWhiteSpace(x)).Select(x =>
-{
+        {
-    var arr = x.Trim().Split(';');
+            var arr = x.Trim().Split(';', StringSplitOptions.TrimEntries);
-    return new Language(arr[0].Trim(), arr[1].Trim(), arr[2].Trim(), arr[3].Trim());
+            return new Language(arr[0], arr[1], arr[2], arr[3]);
-}).ToList();
+        }).ToList();
 
     private static Dictionary<string, string> CODE_MAP = @"
 iv;IVL
@@ -500,13 +486,12 @@ nn;nno
 bs;bos
 sr;srp
 "
-.Trim().Replace("\r", "").Split('\n').Where(x => !string.IsNullOrWhiteSpace(x)).Select(x => x.Trim()).ToDictionary(x => x.Split(';').First().Trim(), x => x.Split(';').Last().Trim());
+        .Trim().Replace("\r", "").Split('\n').Where(x => !string.IsNullOrWhiteSpace(x)).Select(x => x.Trim()).ToDictionary(x => x.Split(';').First().Trim(), x => x.Split(';').Last().Trim());
 
 
     private static string ConvertTwoToThree(string input)
     {
-            if (CODE_MAP.TryGetValue(input, out var code)) return code;
+        return CODE_MAP.GetValueOrDefault(input, input);
-            return input;
     }
 
     /// <summary>
@@ -519,12 +504,12 @@ sr;srp
         if (string.IsNullOrEmpty(outputFile.LangCode)) return;
         var originalLangCode = outputFile.LangCode;
 
-            //先直接查找
+        // 先直接查找
         var lang = ALL_LANGS.FirstOrDefault(a => a.ExtendCode.Equals(outputFile.LangCode, StringComparison.OrdinalIgnoreCase) || a.Code.Equals(outputFile.LangCode, StringComparison.OrdinalIgnoreCase));
-            //处理特殊的扩展语言标记
+        // 处理特殊的扩展语言标记
         if (lang == null)
         {
-                //2位转3位
+            // 2位转3位
             var l = ConvertTwoToThree(outputFile.LangCode.Split('-').First());
             lang = ALL_LANGS.FirstOrDefault(a => a.ExtendCode.Equals(l, StringComparison.OrdinalIgnoreCase) || a.Code.Equals(l, StringComparison.OrdinalIgnoreCase));
         }
@@ -535,13 +520,12 @@ sr;srp
             if (string.IsNullOrEmpty(outputFile.Description))
                 outputFile.Description = outputFile.MediaType == Common.Enum.MediaType.SUBTITLES ? lang.Description : lang.DescriptionAudio;
         }
-            else if (outputFile.LangCode == null) 
+        else
         {
-                outputFile.LangCode = "und"; //无法识别直接置为und
+            outputFile.LangCode = "und"; // 无法识别直接置为und
         }
 
-            //无描述，则把LangCode当作描述
+        // 无描述，则把LangCode当作描述
         if (string.IsNullOrEmpty(outputFile.Description)) outputFile.Description = originalLangCode;
     }
-    }
 }

src/N_m3u8DL-RE/Util/LargeSingleFileSplitUtil.cs

@@ -1,31 +1,23 @@
 using N_m3u8DL_RE.Common.Entity;
 using N_m3u8DL_RE.Common.Log;
 using N_m3u8DL_RE.Common.Util;
-using NiL.JS.Expressions;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Net.Http;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Util
+namespace N_m3u8DL_RE.Util;
+
+internal static class LargeSingleFileSplitUtil
 {
-    internal class LargeSingleFileSplitUtil
-    {
     class Clip
     {
-            public required int index;
+        public required int Index;
-            public required long from;
+        public required long From;
-            public required long to;
+        public required long To;
     }
 
     /// <summary>
     /// URL大文件切片处理
     /// </summary>
-        /// <param name="url"></param>
+    /// <param name="segment"></param>
     /// <param name="headers"></param>
-        /// <param name="splitSegments"></param>
     /// <returns></returns>
     public static async Task<List<MediaSegment>?> SplitUrlAsync(MediaSegment segment, Dictionary<string,string> headers)
     {
@@ -43,10 +35,10 @@ namespace N_m3u8DL_RE.Util
         {
             splitSegments.Add(new MediaSegment()
             {
-                    Index = clip.index,
+                Index = clip.Index,
                 Url = url,
-                    StartRange = clip.from,
+                StartRange = clip.From,
-                    ExpectLength = clip.to == -1 ? null : clip.to - clip.from + 1,
+                ExpectLength = clip.To == -1 ? null : clip.To - clip.From + 1,
                 EncryptInfo = segment.EncryptInfo,
             });
         }
@@ -85,10 +77,10 @@ namespace N_m3u8DL_RE.Util
         return totalSizeBytes;
     }
 
-        //此函数主要是切片下载逻辑
+    // 此函数主要是切片下载逻辑
     private static List<Clip> GetAllClips(string url, long fileSize)
     {
-            List<Clip> clips = new();
+        List<Clip> clips = [];
         int index = 0;
         long counter = 0;
         int perSize = 10 * 1024 * 1024;
@@ -96,11 +88,11 @@ namespace N_m3u8DL_RE.Util
         {
             Clip c = new()
             {
-                    index = index,
+                Index = index,
-                    from = counter,
+                From = counter,
-                    to = counter + perSize
+                To = counter + perSize
             };
-                //没到最后
+            // 没到最后
             if (fileSize - perSize > 0)
             {
                 fileSize -= perSize;
@@ -108,15 +100,14 @@ namespace N_m3u8DL_RE.Util
                 index++;
                 clips.Add(c);
             }
-                //已到最后
+            // 已到最后
             else
             {
-                    c.to = -1;
+                c.To = -1;
                 clips.Add(c);
                 break;
             }
         }
         return clips;
     }
-    }
 }

src/N_m3u8DL-RE/Util/MP4DecryptUtil.cs

@@ -1,21 +1,25 @@
 using Mp4SubtitleParser;
 using N_m3u8DL_RE.Common.Log;
 using N_m3u8DL_RE.Common.Resource;
-using N_m3u8DL_RE.Config;
 using System.Diagnostics;
 using System.Text.RegularExpressions;
+using N_m3u8DL_RE.Enum;
 
-namespace N_m3u8DL_RE.Util
+namespace N_m3u8DL_RE.Util;
+
+internal static partial class MP4DecryptUtil
 {
-    internal class MP4DecryptUtil
+    private static readonly string ZeroKid = "00000000000000000000000000000000";
-    {
+    public static async Task<bool> DecryptAsync(DecryptEngine decryptEngine, string bin, string[]? keys, string source, string dest, string? kid, string init = "", bool isMultiDRM=false)
-        private static string ZeroKid = "00000000000000000000000000000000";
-        public static async Task<bool> DecryptAsync(bool shakaPackager, string bin, string[]? keys, string source, string dest, string? kid, string init = "", bool isMultiDRM=false)
     {
         if (keys == null || keys.Length == 0) return false;
 
+        var keyPairs = keys.ToList();
         string? keyPair = null;
         string? trackId = null;
+        string? tmpEncFile = null;
+        string? tmpDecFile = null;
+        string? workDir = null;
 
         if (isMultiDRM)
         {
@@ -24,80 +28,117 @@ namespace N_m3u8DL_RE.Util
 
         if (!string.IsNullOrEmpty(kid))
         {
-                var test = keys.Where(k => k.StartsWith(kid));
+            var test = keyPairs.Where(k => k.StartsWith(kid)).ToList();
-                if (test.Any()) keyPair = test.First();
+            if (test.Count != 0) keyPair = test.First();
         }
 
-            //Apple
+        // Apple
         if (kid == ZeroKid)
         {
-                keyPair = keys.First();
+            keyPair = keyPairs.First();
             trackId = "1";
         }
 
+        // user only input key, append kid
+        if (keyPair == null && keyPairs.Count == 1 && !keyPairs.First().Contains(':'))
+        {
+            keyPairs = keyPairs.Select(x => $"{kid}:{x}").ToList();
+            keyPair = keyPairs.First();
+        }
+            
         if (keyPair == null) return false;
 
-            //shakaPackager 无法单独解密init文件
+        // shakaPackager/ffmpeg 无法单独解密init文件
-            if (source.EndsWith("_init.mp4") && shakaPackager) return false;
+        if (source.EndsWith("_init.mp4") && decryptEngine != DecryptEngine.MP4DECRYPT) return false;
 
-            var cmd = "";
+        string cmd;
 
         var tmpFile = "";
-            if (shakaPackager)
+        if (decryptEngine == DecryptEngine.SHAKA_PACKAGER)
         {
             var enc = source;
-                //shakaPackager 手动构造文件
+            // shakaPackager 手动构造文件
             if (init != "")
             {
                 tmpFile = Path.ChangeExtension(source, ".itmp");
-                    MergeUtil.CombineMultipleFilesIntoSingleFile(new string[] { init, source }, tmpFile);
+                MergeUtil.CombineMultipleFilesIntoSingleFile([init, source], tmpFile);
                 enc = tmpFile;
             }
 
             cmd = $"--quiet --enable_raw_key_decryption input=\"{enc}\",stream=0,output=\"{dest}\" " +
                   $"--keys {(trackId != null ? $"label={trackId}:" : "")}key_id={(trackId != null ? ZeroKid : kid)}:key={keyPair.Split(':')[1]}";
         }
-            else
+        else if (decryptEngine == DecryptEngine.MP4DECRYPT)
         {
             if (trackId == null)
             {
-                    cmd = string.Join(" ", keys.Select(k => $"--key {k}"));
+                cmd = string.Join(" ", keyPairs.Select(k => $"--key {k}"));
             }
             else
             {
-                    cmd = string.Join(" ", keys.Select(k => $"--key {trackId}:{k.Split(':')[1]}"));
+                cmd = string.Join(" ", keyPairs.Select(k => $"--key {trackId}:{k.Split(':')[1]}"));
             }
+            // 解决mp4decrypt中文问题 切换到源文件所在目录并改名再解密
+            workDir = Path.GetDirectoryName(source)!;
+            tmpEncFile = Path.Combine(workDir, $"{Guid.NewGuid()}{Path.GetExtension(source)}");
+            tmpDecFile = Path.Combine(workDir, $"{Path.GetFileNameWithoutExtension(tmpEncFile)}_dec{Path.GetExtension(tmpEncFile)}");
+            File.Move(source, tmpEncFile);
             if (init != "")
             {
-                    cmd += $" --fragments-info \"{init}\" ";
+                var infoFile = Path.GetDirectoryName(init) == workDir ? Path.GetFileName(init) : init;
+                cmd += $" --fragments-info \"{infoFile}\" ";
             }
-                cmd += $" \"{source}\" \"{dest}\"";
+            cmd += $" \"{Path.GetFileName(tmpEncFile)}\" \"{Path.GetFileName(tmpDecFile)}\"";
+        }
+        else
+        {
+            var enc = source;
+            // ffmpeg实时解密 手动构造文件
+            if (init != "")
+            {
+                tmpFile = Path.ChangeExtension(source, ".itmp");
+                MergeUtil.CombineMultipleFilesIntoSingleFile([init, source], tmpFile);
+                enc = tmpFile;
             }
             
-            await RunCommandAsync(bin, cmd);
+            cmd = $"-loglevel error -nostdin -decryption_key {keyPair.Split(':')[1]} -i \"{enc}\" -c copy \"{dest}\"";
+        }
 
-            if (File.Exists(dest) && new FileInfo(dest).Length > 0)
+        var isSuccess = await RunCommandAsync(bin, cmd, workDir);
+        
+        // mp4decrypt 还原文件改名操作
+        if (workDir is not null)
+        {
+            if (File.Exists(tmpEncFile)) File.Move(tmpEncFile, source);
+            if (File.Exists(tmpDecFile)) File.Move(tmpDecFile, dest);
+        }
+
+        if (isSuccess)
         {
             if (tmpFile != "" && File.Exists(tmpFile)) File.Delete(tmpFile);
             return true;
         }
         
+        Logger.Error(ResString.decryptionFailed);
         return false;
     }
 
-        private static async Task RunCommandAsync(string name, string arg)
+    private static async Task<bool> RunCommandAsync(string name, string arg, string? workDir = null)
     {
         Logger.DebugMarkUp($"FileName: {name}");
         Logger.DebugMarkUp($"Arguments: {arg}");
-            await Process.Start(new ProcessStartInfo()
+        var process = Process.Start(new ProcessStartInfo()
         {
             FileName = name,
             Arguments = arg,
-                //RedirectStandardOutput = true,
+            // RedirectStandardOutput = true,
-                //RedirectStandardError = true,
+            // RedirectStandardError = true,
             CreateNoWindow = true,
-                UseShellExecute = false
+            UseShellExecute = false,
-            })!.WaitForExitAsync();
+            WorkingDirectory = workDir
+        });
+        await process!.WaitForExitAsync();
+        return process.ExitCode == 0;
     }
 
     /// <summary>
@@ -116,16 +157,14 @@ namespace N_m3u8DL_RE.Util
             Logger.InfoMarkUp(ResString.searchKey);
             using var stream = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.Read);
             using var reader = new StreamReader(stream);
-                var line = "";
+            while (await reader.ReadLineAsync() is { } line)
-                while ((line = await reader.ReadLineAsync()) != null)
-                {
-                    if (line.Trim().StartsWith(kid))
             {
+                if (!line.Trim().StartsWith(kid)) continue;
+                
                 Logger.InfoMarkUp($"[green]OK[/] [grey]{line.Trim()}[/]");
                 return line.Trim();
             }
         }
-            }
         catch (Exception ex)
         {
             Logger.ErrorMarkUp(ex.Message);
@@ -144,17 +183,15 @@ namespace N_m3u8DL_RE.Util
 
     public static ParsedMP4Info GetMP4Info(string output)
     {
-            using (var fs = File.OpenRead(output))
+        using var fs = File.OpenRead(output);
-            {
+        var header = new byte[1 * 1024 * 1024]; // 1MB
-                var header = new byte[1 * 1024 * 1024]; //1MB
+        _ = fs.Read(header);
-                fs.Read(header);
         return GetMP4Info(header);
     }
-        }
 
     public static string? ReadInitShaka(string output, string bin)
     {
-            Regex ShakaKeyIDRegex = new Regex("Key for key_id=([0-9a-f]+) was not found");
+        Regex shakaKeyIdRegex = KidOutputRegex();
 
         // TODO: handle the case that shaka packager actually decrypted (key ID == ZeroKid)
         //       - stop process
@@ -174,7 +211,9 @@ namespace N_m3u8DL_RE.Util
         p.Start();
         var errorOutput = p.StandardError.ReadToEnd();
         p.WaitForExit();
-            return ShakaKeyIDRegex.Match(errorOutput).Groups[1].Value;
+        return shakaKeyIdRegex.Match(errorOutput).Groups[1].Value;
-        }
     }
+
+    [GeneratedRegex("Key for key_id=([0-9a-f]+) was not found")]
+    private static partial Regex KidOutputRegex();
 }

src/N_m3u8DL-RE/Util/MediainfoUtil.cs

@@ -1,36 +1,30 @@
 using N_m3u8DL_RE.Entity;
-using System;
-using System.Collections.Generic;
 using System.Diagnostics;
-using System.Linq;
-using System.Text;
 using System.Text.RegularExpressions;
-using System.Threading.Tasks;
-using System.Xml.Linq;
 
-namespace N_m3u8DL_RE.Util
+namespace N_m3u8DL_RE.Util;
+
+internal static partial class MediainfoUtil
 {
-    internal partial class MediainfoUtil
-    {
     [GeneratedRegex("  Stream #.*")]
     private static partial Regex TextRegex();
-        [GeneratedRegex("#0:\\d(\\[0x\\w+?\\])")]
+    [GeneratedRegex(@"#0:\d(\[0x\w+?\])")]
     private static partial Regex IdRegex();
     [GeneratedRegex(": (\\w+): (.*)")]
     private static partial Regex TypeRegex();
     [GeneratedRegex("(.*?)(,|$)")]
     private static partial Regex BaseInfoRegex();
-        [GeneratedRegex(" \\/ 0x\\w+")]
+    [GeneratedRegex(@" \/ 0x\w+")]
     private static partial Regex ReplaceRegex();
-        [GeneratedRegex("\\d{2,}x\\d+")]
+    [GeneratedRegex(@"\d{2,}x\d+")]
     private static partial Regex ResRegex();
-        [GeneratedRegex("\\d+ kb\\/s")]
+    [GeneratedRegex(@"\d+ kb\/s")]
     private static partial Regex BitrateRegex();
-        [GeneratedRegex("(\\d+(\\.\\d+)?) fps")]
+    [GeneratedRegex(@"(\d+(\.\d+)?) fps")]
     private static partial Regex FpsRegex();
-        [GeneratedRegex("DOVI configuration record.*profile: (\\d).*compatibility id: (\\d)")]
+    [GeneratedRegex(@"DOVI configuration record.*profile: (\d).*compatibility id: (\d)")]
     private static partial Regex DoViRegex();
-        [GeneratedRegex("Duration.*?start: (\\d+\\.?\\d{0,3})")]
+    [GeneratedRegex(@"Duration.*?start: (\d+\.?\d{0,3})")]
     private static partial Regex StartRegex();
 
     public static async Task<List<Mediainfo>> ReadInfoAsync(string binary, string file)
@@ -48,7 +42,7 @@ namespace N_m3u8DL_RE.Util
             RedirectStandardError = true,
             UseShellExecute = false
         })!;
-            var output = p.StandardError.ReadToEnd();
+        var output = await p.StandardError.ReadToEndAsync();
         await p.WaitForExitAsync();
 
         foreach (Match stream in TextRegex().Matches(output))
@@ -87,7 +81,7 @@ namespace N_m3u8DL_RE.Util
 
         if (result.Count == 0)
         {
-                result.Add(new Mediainfo()
+            result.Add(new Mediainfo
             {
                 Type = "Unknown"
             });
@@ -95,5 +89,4 @@ namespace N_m3u8DL_RE.Util
 
         return result;
     }
-    }
 }

src/N_m3u8DL-RE/Util/MergeUtil.cs

@@ -1,21 +1,14 @@
 using N_m3u8DL_RE.Common.Log;
 using N_m3u8DL_RE.Entity;
 using Spectre.Console;
-using System;
-using System.Collections.Generic;
-using System.CommandLine;
 using System.Diagnostics;
-using System.Globalization;
-using System.Linq;
 using System.Text;
-using System.Threading.Tasks;
+using N_m3u8DL_RE.Enum;
-using System.Xml;
-using System.Xml.Linq;
 
-namespace N_m3u8DL_RE.Util
+namespace N_m3u8DL_RE.Util;
+
+internal static class MergeUtil
 {
-    internal class MergeUtil
-    {
     /// <summary>
     /// 输入一堆已存在的文件，合并到新文件
     /// </summary>
@@ -34,20 +27,16 @@ namespace N_m3u8DL_RE.Util
         if (!Directory.Exists(Path.GetDirectoryName(outputFilePath)))
             Directory.CreateDirectory(Path.GetDirectoryName(outputFilePath)!);
 
-            string[] inputFilePaths = files;
+        var inputFilePaths = files;
-            using (var outputStream = File.Create(outputFilePath))
+        using var outputStream = File.Create(outputFilePath);
-            {
         foreach (var inputFilePath in inputFilePaths)
         {
             if (inputFilePath == "")
                 continue;
-                    using (var inputStream = File.OpenRead(inputFilePath))
+            using var inputStream = File.OpenRead(inputFilePath);
-                    {
             inputStream.CopyTo(outputStream);
         }
     }
-            }
-        }
 
     private static int InvokeFFmpeg(string binary, string command, string workingDirectory)
     {
@@ -79,25 +68,21 @@ namespace N_m3u8DL_RE.Util
     public static string[] PartialCombineMultipleFiles(string[] files)
     {
         var newFiles = new List<string>();
-            int div = 0;
+        var div = files.Length <= 90000 ? 100 : 200;
-            if (files.Length <= 90000)
-                div = 100;
-            else
-                div = 200;
 
-            string outputName = Path.Combine(Path.GetDirectoryName(files[0])!, "T");
+        var outputName = Path.Combine(Path.GetDirectoryName(files[0])!, "T");
-            int index = 0; //序号
+        var index = 0; // 序号
 
-            //按照div的容量分割为小数组
+        // 按照div的容量分割为小数组
-            string[][] li = Enumerable.Range(0, files.Count() / div + 1).Select(x => files.Skip(x * div).Take(div).ToArray()).ToArray();
+        var li = Enumerable.Range(0, files.Length / div + 1).Select(x => files.Skip(x * div).Take(div).ToArray()).ToArray();
         foreach (var items in li)
         {
-                if (items.Count() == 0)
+            if (items.Length == 0)
                 continue;
             var output = outputName + index.ToString("0000") + ".ts";
             CombineMultipleFilesIntoSingleFile(items, output);
             newFiles.Add(output);
-                //合并后删除这些文件
+            // 合并后删除这些文件
             foreach (var item in items)
             {
                 File.Delete(item);
@@ -113,7 +98,7 @@ namespace N_m3u8DL_RE.Util
         bool writeDate = true, bool useConcatDemuxer = false, string poster = "", string audioName = "", string title = "",
         string copyright = "", string comment = "", string encodingTool = "", string recTime = "")
     {
-            //改为绝对路径
+        // 改为绝对路径
         outputPath = Path.GetFullPath(outputPath);
 
         string dateString = string.IsNullOrEmpty(recTime) ? DateTime.Now.ToString("o") : recTime;
@@ -186,19 +171,19 @@ namespace N_m3u8DL_RE.Util
         return code == 0;
     }
 
-        public static bool MuxInputsByFFmpeg(string binary, OutputFile[] files, string outputPath, bool mp4, bool dateinfo)
+    public static bool MuxInputsByFFmpeg(string binary, OutputFile[] files, string outputPath, MuxFormat muxFormat, bool dateinfo)
     {
-            var ext = mp4 ? "mp4" : "mkv";
+        var ext = OtherUtil.GetMuxExtension(muxFormat);
         string dateString = DateTime.Now.ToString("o");
         StringBuilder command = new StringBuilder("-loglevel warning -nostdin -y -dn ");
 
-            //INPUT
+        // INPUT
         foreach (var item in files)
         {
             command.Append($" -i \"{item.FilePath}\" ");
         }
 
-            //MAP
+        // MAP
         for (int i = 0; i < files.Length; i++)
         {
             command.Append($" -map {i} ");
@@ -206,19 +191,22 @@ namespace N_m3u8DL_RE.Util
 
         var srt = files.Any(x => x.FilePath.EndsWith(".srt"));
 
-            if (mp4)
+        if (muxFormat == MuxFormat.MP4)
-                command.Append($" -strict unofficial -c:a copy -c:v copy -c:s mov_text "); //mp4不支持vtt/srt字幕，必须转换格式
+            command.Append($" -strict unofficial -c:a copy -c:v copy -c:s mov_text "); // mp4不支持vtt/srt字幕，必须转换格式
-            else
+        else if (muxFormat == MuxFormat.TS)
+            command.Append($" -strict unofficial -c:a copy -c:v copy ");
+        else if (muxFormat == MuxFormat.MKV)
             command.Append($" -strict unofficial -c:a copy -c:v copy -c:s {(srt ? "srt" : "webvtt")} ");
+        else throw new ArgumentException($"unknown format: {muxFormat}");
 
-            //CLEAN
+        // CLEAN
         command.Append(" -map_metadata -1 ");
 
-            //LANG and NAME
+        // LANG and NAME
         var streamIndex = 0;
         for (int i = 0; i < files.Length; i++)
         {
-                //转换语言代码
+            // 转换语言代码
             LanguageCodeUtil.ConvertLangCodeAndDisplayName(files[i]);
             command.Append($" -metadata:s:{streamIndex} language=\"{files[i].LangCode ?? "und"}\" ");
             if (!string.IsNullOrEmpty(files[i].Description))
@@ -240,11 +228,11 @@ namespace N_m3u8DL_RE.Util
         var audioTracks = files.Where(x => x.MediaType == Common.Enum.MediaType.AUDIO);
         var subTracks = files.Where(x => x.MediaType == Common.Enum.MediaType.AUDIO);
         if (videoTracks.Any()) command.Append(" -disposition:v:0 default ");
-            //字幕都不设置默认
+        // 字幕都不设置默认
         if (subTracks.Any()) command.Append(" -disposition:s 0 ");
         if (audioTracks.Any())
         {
-                //音频除了第一个音轨 都不设置默认
+            // 音频除了第一个音轨 都不设置默认
             command.Append(" -disposition:a:0 default ");
             for (int i = 1; i < audioTracks.Count(); i++)
             {
@@ -254,7 +242,7 @@ namespace N_m3u8DL_RE.Util
 
         if (dateinfo) command.Append($" -metadata date=\"{dateString}\" ");
         command.Append($" -ignore_unknown -copy_unknown ");
-            command.Append($" \"{outputPath}.{ext}\"");
+        command.Append($" \"{outputPath}{ext}\"");
 
         var code = InvokeFFmpeg(binary, command.ToString(), Environment.CurrentDirectory);
 
@@ -269,16 +257,16 @@ namespace N_m3u8DL_RE.Util
 
         var dFlag = false;
 
-            //LANG and NAME
+        // LANG and NAME
         for (int i = 0; i < files.Length; i++)
         {
-                //转换语言代码
+            // 转换语言代码
             LanguageCodeUtil.ConvertLangCodeAndDisplayName(files[i]);
             command.Append($" --language 0:\"{files[i].LangCode ?? "und"}\" ");
-                //字幕都不设置默认
+            // 字幕都不设置默认
             if (files[i].MediaType == Common.Enum.MediaType.SUBTITLES)
                 command.Append($" --default-track 0:no ");
-                //音频除了第一个音轨 都不设置默认
+            // 音频除了第一个音轨 都不设置默认
             if (files[i].MediaType == Common.Enum.MediaType.AUDIO)
             {
                 if (dFlag)
@@ -294,5 +282,4 @@ namespace N_m3u8DL_RE.Util
 
         return code == 0;
     }
-    }
 }

src/N_m3u8DL-RE/Util/OtherUtil.cs

@@ -1,21 +1,16 @@
-using N_m3u8DL_RE.Common.Entity;
+using N_m3u8DL_RE.Enum;
-using N_m3u8DL_RE.Common.Log;
-using N_m3u8DL_RE.Enum;
-using System.CommandLine;
 using System.IO.Compression;
-using System.Text;
 using System.Text.RegularExpressions;
 
-namespace N_m3u8DL_RE.Util
+namespace N_m3u8DL_RE.Util;
+
+internal static partial class OtherUtil
 {
-    internal class OtherUtil
-    {
     public static Dictionary<string, string> SplitHeaderArrayToDic(string[]? headers)
     {
         Dictionary<string, string> dic = new();
+        if (headers == null) return dic;
         
-            if (headers != null)
-            {
         foreach (string header in headers)
         {
             var index = header.IndexOf(':');
@@ -24,20 +19,15 @@ namespace N_m3u8DL_RE.Util
                 dic[header[..index].Trim().ToLower()] = header[(index + 1)..].Trim();
             }
         }
-            }
 
         return dic;
     }
 
-        private static char[] InvalidChars = "34,60,62,124,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,58,42,63,92,47"
+    private static readonly char[] InvalidChars = "34,60,62,124,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,58,42,63,92,47"
         .Split(',').Select(s => (char)int.Parse(s)).ToArray();
-        public static string GetValidFileName(string input, string re = ".", bool filterSlash = false)
+    public static string GetValidFileName(string input, string re = "_", bool filterSlash = false)
     {
-            string title = input;
+        var title = InvalidChars.Aggregate(input, (current, invalidChar) => current.Replace(invalidChar.ToString(), re));
-            foreach (char invalidChar in InvalidChars)
-            {
-                title = title.Replace(invalidChar.ToString(), re);
-            }
         if (filterSlash)
         {
             title = title.Replace("/", re);
@@ -50,6 +40,7 @@ namespace N_m3u8DL_RE.Util
     /// 从输入自动获取文件名
     /// </summary>
     /// <param name="input"></param>
+    /// <param name="addSuffix"></param>
     /// <returns></returns>
     public static string GetFileNameFromInput(string input, bool addSuffix = true)
     {
@@ -103,7 +94,7 @@ namespace N_m3u8DL_RE.Util
     /// <exception cref="ArgumentException"></exception>
     public static double ParseSeconds(string timeStr)
     {
-            var pattern = new Regex(@"^(?:(\d+)h)?(?:(\d+)m)?(?:(\d+)s)?$");
+        var pattern = TimeStrRegex();
 
         var match = pattern.Match(timeStr);
 
@@ -119,7 +110,7 @@ namespace N_m3u8DL_RE.Util
         return hours * 3600 + minutes * 60 + seconds;
     }
 
-        //若该文件夹为空，删除，同时判断其父文件夹，直到遇到根目录或不为空的目录
+    // 若该文件夹为空，删除，同时判断其父文件夹，直到遇到根目录或不为空的目录
     public static void SafeDeleteDir(string dirPath)
     {
         if (string.IsNullOrEmpty(dirPath) || !Directory.Exists(dirPath))
@@ -143,15 +134,15 @@ namespace N_m3u8DL_RE.Util
     /// <param name="filePath"></param>
     public static async Task DeGzipFileAsync(string filePath)
     {
-            string deGzipFile = Path.ChangeExtension(filePath, ".tmp");
+        var deGzipFile = Path.ChangeExtension(filePath, ".dezip_tmp");
         try
         {
-                using (var fileToDecompressAsStream = File.OpenRead(filePath))
+            await using (var fileToDecompressAsStream = File.OpenRead(filePath))
             {
-                    using var decompressedStream = File.Create(deGzipFile);
+                await using var decompressedStream = File.Create(deGzipFile);
-                    using var decompressionStream = new GZipStream(fileToDecompressAsStream, CompressionMode.Decompress);
+                await using var decompressionStream = new GZipStream(fileToDecompressAsStream, CompressionMode.Decompress);
                 await decompressionStream.CopyToAsync(decompressedStream);
-                }
+            };
             File.Delete(filePath);
             File.Move(deGzipFile, filePath);
         }
@@ -165,5 +156,18 @@ namespace N_m3u8DL_RE.Util
     {
         return Environment.GetEnvironmentVariable(key) ?? defaultValue;
     }
+
+    public static string GetMuxExtension(MuxFormat muxFormat)
+    {
+        return muxFormat switch
+        {
+            MuxFormat.MP4 => ".mp4",
+            MuxFormat.MKV => ".mkv",
+            MuxFormat.TS => ".ts",
+            _ => throw new ArgumentException($"unknown format: {muxFormat}")
+        };
     }
+
+    [GeneratedRegex(@"^(?:(\d+)h)?(?:(\d+)m)?(?:(\d+)s)?$")]
+    private static partial Regex TimeStrRegex();
 }

src/N_m3u8DL-RE/Util/PipeUtil.cs

@@ -1,27 +1,20 @@
 using N_m3u8DL_RE.Common.Log;
-using N_m3u8DL_RE.Common.Resource;
 using Spectre.Console;
-using System;
-using System.Collections.Generic;
-using System.CommandLine;
 using System.Diagnostics;
 using System.IO.Pipes;
-using System.Linq;
 using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Util
+namespace N_m3u8DL_RE.Util;
+
+internal static class PipeUtil
 {
-    internal class PipeUtil
-    {
     public static Stream CreatePipe(string pipeName)
     {
         if (OperatingSystem.IsWindows())
         {
             return new NamedPipeServerStream(pipeName, PipeDirection.InOut);
         }
-            else
+
-            {
         var path = Path.Combine(Path.GetTempPath(), pipeName);
         using var p = new Process();
         p.StartInfo = new ProcessStartInfo()
@@ -38,7 +31,6 @@ namespace N_m3u8DL_RE.Util
         Thread.Sleep(200);
         return new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.Read);
     }
-        }
 
     public static async Task<bool> StartPipeMuxAsync(string binary, string[] pipeNames, string outputPath)
     {
@@ -67,7 +59,7 @@ namespace N_m3u8DL_RE.Util
             if (OperatingSystem.IsWindows())
                 command.Append($" -i \"\\\\.\\pipe\\{item}\" ");
             else
-                    //command.Append($" -i \"unix://{Path.Combine(Path.GetTempPath(), $"CoreFxPipe_{item}")}\" ");
+                // command.Append($" -i \"unix://{Path.Combine(Path.GetTempPath(), $"CoreFxPipe_{item}")}\" ");
                 command.Append($" -i \"{Path.Combine(pipeDir, item)}\" ");
         }
 
@@ -83,7 +75,7 @@ namespace N_m3u8DL_RE.Util
 
         if (!string.IsNullOrEmpty(customDest))
         {
-                if (customDest.Trim().StartsWith("-"))
+            if (customDest.Trim().StartsWith('-'))
                 command.Append(customDest);
             else
                 command.Append($" -f mpegts -shortest \"{customDest}\"");
@@ -103,11 +95,10 @@ namespace N_m3u8DL_RE.Util
             CreateNoWindow = true,
             UseShellExecute = false
         };
-            //p.StartInfo.Environment.Add("FFREPORT", "file=ffreport.log:level=42");
+        // p.StartInfo.Environment.Add("FFREPORT", "file=ffreport.log:level=42");
         p.Start();
         p.WaitForExit();
 
         return p.ExitCode == 0;
     }
-    }
 }

src/N_m3u8DL-RE/Util/SubtitleUtil.cs

@@ -1,40 +1,32 @@
 using N_m3u8DL_RE.Common.Entity;
 using N_m3u8DL_RE.Common.Log;
 using N_m3u8DL_RE.Common.Resource;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
-namespace N_m3u8DL_RE.Util
+namespace N_m3u8DL_RE.Util;
+
+internal static class SubtitleUtil
 {
-    internal class SubtitleUtil
-    {
     /// <summary>
     /// 写出图形字幕PNG文件
     /// </summary>
     /// <param name="finalVtt"></param>
     /// <param name="tmpDir">临时目录</param>
     /// <returns></returns>
-        public static async Task<bool> TryWriteImagePngsAsync(WebVttSub? finalVtt, string tmpDir)
+    public static async Task TryWriteImagePngsAsync(WebVttSub? finalVtt, string tmpDir)
     {
         if (finalVtt != null && finalVtt.Cues.Any(v => v.Payload.StartsWith("Base64::")))
         {
             Logger.WarnMarkUp(ResString.processImageSub);
-                var _i = 0;
+            var i = 0;
             foreach (var img in finalVtt.Cues.Where(v => v.Payload.StartsWith("Base64::")))
             {
-                    var name = $"{_i++}.png";
+                var name = $"{i++}.png";
                 var dest = "";
-                    for (; File.Exists(dest = Path.Combine(tmpDir, name)); name = $"{_i++}.png") ;
+                for (; File.Exists(dest = Path.Combine(tmpDir, name)); name = $"{i++}.png") ;
                 var base64 = img.Payload[8..];
                 await File.WriteAllBytesAsync(dest, Convert.FromBase64String(base64));
                 img.Payload = name;
             }
-                return true;
-            }
-            else return false;
         }
     }
 }