Add ffmpeg windows

Author: mthrok

.github/scripts/build_ffmpeg.bat

@@ -0,0 +1,9 @@
+@echo off
+
+set PROJ_FOLDER=%cd%
+
+choco install -y --no-progress msys2 --package-parameters "/NoUpdate"
+C:\tools\msys64\usr\bin\env MSYSTEM=MINGW64 /bin/bash -l -c "pacman -S --noconfirm --needed base-devel mingw-w64-x86_64-toolchain diffutils"
+C:\tools\msys64\usr\bin\env MSYSTEM=MINGW64 /bin/bash -l -c "cd ${PROJ_FOLDER} && packaging/vc_env_helper.bat bash .github/scripts/build_ffmpeg.sh"
+
+:end

.github/workflows/ffmpeg.yml

@@ -87,3 +87,37 @@ jobs:
           if-no-files-found: error
           retention-days: 7
           overwrite: true
+
+  win-64:
+    strategy:
+      fail-fast: false
+      matrix:
+        ffmpeg_version: ["4.4.5", "5.1.6", "6.1.2", "7.1.1", "8.0", "master"]
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Build
+        shell: bash
+        run: |
+          export FFMPEG_VERSION="${{ matrix.ffmpeg_version }}"
+          export FFMPEG_ROOT="${PWD}/ffmpeg"
+
+          .github/scripts/build_ffmpeg.bat
+
+          tar -cf ffmpeg.tar.gz ffmpeg/include ffmpeg/lib
+
+          artifact_dir="${GITHUB_WORKSPACE}/artifacts/$(date +%Y-%m-%d)/"
+          mkdir -p "${artifact_dir}"
+          mv ffmpeg.tar.gz "${artifact_dir}/ffmpeg_${FFMPEG_VERSION}_win64.tar.gz"
+
+      - uses: actions/upload-artifact@v4
+        name: Upload build artifact
+        with:
+          name: "ffmpg_${{ matrix.ffmpeg_version }}_windows"
+          path: "${{ github.workspace }}/artifacts"
+          if-no-files-found: error
+          retention-days: 7
+          overwrite: true

packaging/vc_env_helper.bat

@@ -0,0 +1,41 @@
+@echo on
+
+set VC_VERSION_LOWER=17
+set VC_VERSION_UPPER=18
+
+for /f "usebackq tokens=*" %%i in (`"%ProgramFiles(x86)%\Microsoft Visual Studio\Installer\vswhere.exe" -legacy -products * -version [%VC_VERSION_LOWER%^,%VC_VERSION_UPPER%^) -property installationPath`) do (
+    if exist "%%i" if exist "%%i\VC\Auxiliary\Build\vcvarsall.bat" (
+        set "VS15INSTALLDIR=%%i"
+        set "VS15VCVARSALL=%%i\VC\Auxiliary\Build\vcvarsall.bat"
+        goto vswhere
+    )
+)
+
+:vswhere
+if "%VSDEVCMD_ARGS%" == "" (
+    call "%VS15VCVARSALL%" x64 || exit /b 1
+) else (
+    call "%VS15VCVARSALL%" x64 %VSDEVCMD_ARGS% || exit /b 1
+)
+
+@echo on
+
+if "%CU_VERSION%" == "xpu" call "C:\Program Files (x86)\Intel\oneAPI\setvars.bat"
+
+set DISTUTILS_USE_SDK=1
+
+set args=%1
+shift
+:start
+if [%1] == [] goto done
+set args=%args% %1
+shift
+goto start
+
+:done
+if "%args%" == "" (
+    echo Usage: vc_env_helper.bat [command] [args]
+    echo e.g. vc_env_helper.bat cl /c test.cpp
+)
+
+%args% || exit /b 1