Bundle FFmpeg as Tauri sidecar, download in CI

.github/workflows/release.yml

@@ -28,6 +28,14 @@ jobs:
             libgtk-3-dev \
             libayatana-appindicator3-dev \
             rpm
+      - name: Download FFmpeg (bundled sidecar)
+        run: |
+          mkdir -p src-tauri/binaries
+          curl -sL "https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz" -o /tmp/ffmpeg.tar.xz
+          tar -xf /tmp/ffmpeg.tar.xz -C /tmp
+          cp /tmp/ffmpeg-*-amd64-static/ffmpeg src-tauri/binaries/ffmpeg-x86_64-unknown-linux-gnu
+          cp /tmp/ffmpeg-*-amd64-static/ffprobe src-tauri/binaries/ffprobe-x86_64-unknown-linux-gnu
+          chmod +x src-tauri/binaries/*
       - uses: tauri-apps/tauri-action@v0
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}