ci: add FFmpeg preflight workflow and helpers

.github/workflows/ffmpeg-preflight.yml

@@ -0,0 +1,129 @@
+name: FFmpeg Preflight and Build
+
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+    branches: [ main, master ]
+
+jobs:
+  preflight:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+
+    env:
+      # Provide a fallback URL via repository secret `FFMPEG_URL_{OS}` or `FFMPEG_URL`.
+      FFMPEG_URL: ${{ secrets.FFMPEG_URL }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '18'
+
+      - name: Set up Rust
+        uses: dtolnay/gh-actions-rs@stable
+
+      - name: Determine OS-specific ffmpeg URL
+        id: ffmpeg-url
+        shell: bash
+        run: |
+          echo "RUNNER_OS=${RUNNER_OS}"
+          if [[ "${RUNNER_OS}" == "Windows" ]]; then
+            echo "url=${{ secrets.FFMPEG_URL_WINDOWS || secrets.FFMPEG_URL }}" >> $GITHUB_OUTPUT
+          elif [[ "${RUNNER_OS}" == "macOS" ]]; then
+            echo "url=${{ secrets.FFMPEG_URL_MACOS || secrets.FFMPEG_URL }}" >> $GITHUB_OUTPUT
+          else
+            echo "url=${{ secrets.FFMPEG_URL_LINUX || secrets.FFMPEG_URL }}" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Create resources dir
+        run: mkdir -p src-tauri/resources
+
+      - name: Download and install FFmpeg into resources
+        if: steps.ffmpeg-url.outputs.url != ''
+        shell: bash
+        run: |
+          set -euo pipefail
+          URL="${{ steps.ffmpeg-url.outputs.url }}"
+          echo "Downloading ffmpeg from: $URL"
+          FNAME="${RUNNER_TEMP}/ffmpeg_bundle"
+          if [[ "${RUNNER_OS}" == "Windows" ]]; then
+            powershell -Command "(New-Object Net.WebClient).DownloadFile('$URL', '$FNAME.zip')"
+            powershell -Command "Expand-Archive -Path '$FNAME.zip' -DestinationPath '${{ github.workspace }}\\src-tauri\\resources'"
+          else
+            curl -sL "$URL" -o "$FNAME"
+            # Attempt to extract common archive formats
+            if file "$FNAME" | grep -q 'Zip archive'; then
+              unzip -q "$FNAME" -d src-tauri/resources
+            elif file "$FNAME" | grep -q 'gzip compressed data'; then
+              tar -xzf "$FNAME" -C src-tauri/resources
+            elif file "$FNAME" | grep -q 'XZ compressed'; then
+              tar -xJf "$FNAME" -C src-tauri/resources
+            else
+              # Assume raw binary
+              mv "$FNAME" src-tauri/resources/ffmpeg
+              chmod +x src-tauri/resources/ffmpeg
+            fi
+          fi
+
+      - name: List resources
+        run: ls -la src-tauri/resources || true
+
+      - name: Locate ffmpeg binary (Linux/macOS)
+        if: runner.os != 'Windows'
+        shell: bash
+        run: |
+          set -euo pipefail
+          # Try to find an ffmpeg executable anywhere under resources
+          BINPATH=$(find src-tauri/resources -type f -iname ffmpeg -print -quit || true)
+          if [ -z "$BINPATH" ]; then
+            BINPATH=$(find src-tauri/resources -type f -iname 'ffmpeg*' -print -quit || true)
+          fi
+          if [ -n "$BINPATH" ]; then
+            echo "Found ffmpeg at $BINPATH"
+            cp "$BINPATH" src-tauri/resources/ffmpeg
+            chmod +x src-tauri/resources/ffmpeg
+          else
+            echo "ffmpeg binary not found in resources"
+            ls -R src-tauri/resources || true
+            exit 1
+          fi
+
+      - name: Locate ffmpeg binary (Windows)
+        if: runner.os == 'Windows'
+        shell: pwsh
+        run: |
+          $found = Get-ChildItem -Path src-tauri/resources -Recurse -Filter ffmpeg.exe -ErrorAction SilentlyContinue | Select-Object -First 1
+          if (-not $found) {
+            $found = Get-ChildItem -Path src-tauri/resources -Recurse -Filter '*ffmpeg*' -ErrorAction SilentlyContinue | Select-Object -First 1
+          }
+          if ($found) {
+            Write-Host "Found ffmpeg at $($found.FullName)"
+            Copy-Item $found.FullName -Destination 'src-tauri\resources\ffmpeg.exe' -Force
+          } else {
+            Write-Host "ffmpeg not found in src-tauri/resources"
+            Get-ChildItem src-tauri\resources -Recurse | Format-List
+            exit 1
+          }
+
+      - name: Install npm deps
+        run: npm ci
+
+      - name: Copy project FFmpeg helpers
+        run: node tools/copy-ffmpeg.js || true
+
+      - name: Build Rust and run ffmpeg preflight check
+        working-directory: src-tauri
+        run: |
+          set -e
+          cargo build --release
+          cargo run --release --bin check_ffmpeg
+
+      - name: Optional frontend build
+        run: npm run build --if-present || true