build.yml: switch FFmpeg Windows build URL...

to a hopefully more stable one that doesn't require constant attention.

.github/workflows/build.yml

@@ -71,23 +71,22 @@ jobs:
     strategy:
       matrix:
         include:
-          - ffmpeg_version: "4.3.1"
+          - ffmpeg_version: latest
-            ffmpeg_download_url: https://www.gyan.dev/ffmpeg/builds/packages/ffmpeg-4.3.1-2020-10-28-full_build-shared.7z
+            ffmpeg_download_url: https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-full-shared.7z
-            ffmpeg_directory_name: ffmpeg-4.3.1-2020-10-28-full_build-shared
       fail-fast: false
     env:
-      FFMPEG_VERSION: ${{ matrix.ffmpeg_version }}
       FFMPEG_DOWNLOAD_URL: ${{ matrix.ffmpeg_download_url }}
-      FFMPEG_DIRECTORY_NAME: ${{ matrix.ffmpeg_directory_name }}
     steps:
       - uses: actions/checkout@v2
       - name: Install dependencies
         run: |
           $VCINSTALLDIR = $(& "${env:ProgramFiles(x86)}\Microsoft Visual Studio\Installer\vswhere.exe" -latest -property installationPath)
           Add-Content $env:GITHUB_ENV "LIBCLANG_PATH=${VCINSTALLDIR}\VC\Tools\LLVM\x64\bin`n"
-          Invoke-WebRequest "${env:FFMPEG_DOWNLOAD_URL}" -OutFile "${env:FFMPEG_DIRECTORY_NAME}.7z"
+          Invoke-WebRequest "${env:FFMPEG_DOWNLOAD_URL}" -OutFile ffmpeg-release-full-shared.7z
-          7z x "${env:FFMPEG_DIRECTORY_NAME}.7z"
+          7z x ffmpeg-release-full-shared.7z
-          Add-Content $env:GITHUB_ENV "FFMPEG_DIR=${pwd}\${env:FFMPEG_DIRECTORY_NAME}`n"
+          mkdir ffmpeg
+          mv ffmpeg-*/* ffmpeg/
+          Add-Content $env:GITHUB_ENV "FFMPEG_DIR=${pwd}\ffmpeg`n"
       - name: Set up Rust
         uses: actions-rs/toolchain@v1
         with: