video-build.yml

name: Build Promo Video

on:
  push:
    branches: [master, main]
    paths:
      - 'promo/**'
  release:
    types: [published]
  workflow_dispatch:

concurrency:
  group: video-${{ github.ref }}
  cancel-in-progress: true

permissions:
  contents: write

jobs:
  render-video:
    name: Render Promo Video
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.11'

      - name: Install dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y ffmpeg libcairo2-dev libpango1.0-dev
          pip install manim==0.18.1 edge-tts mutagen

      - name: Generate narration audio
        run: |
          cd promo
          python generate_audio.py
          cat durations.json

      - name: Render synced promo video
        run: |
          cd promo
          manim render -qh --format mp4 promo_scene.py ProductPromo

      - name: Compute version-derived filename
        id: vid
        run: |
          if [[ "$GITHUB_REF" == refs/tags/* ]]; then
            VERSION="${GITHUB_REF#refs/tags/}"
          else
            VERSION="dev-latest"
          fi
          echo "version=$VERSION" >> $GITHUB_OUTPUT
          echo "filename=eApps_${VERSION}_promo.mp4" >> $GITHUB_OUTPUT

      - name: Merge video + audio
        run: |
          cd promo
          VIDEO=$(find media/videos -name "ProductPromo.mp4" | head -1)
          if [ -z "$VIDEO" ]; then
            echo "::error::Manim render produced no MP4"
            exit 1
          fi
          if [ ! -f narration.mp3 ]; then
            echo "::error::narration.mp3 missing"
            exit 1
          fi
          ffmpeg -y -i "$VIDEO" -i narration.mp3 \
            -c:v copy -c:a aac -b:a 192k \
            -map 0:v:0 -map 1:a:0 \
            -shortest \
            ${{ steps.vid.outputs.filename }}
          ls -lh ${{ steps.vid.outputs.filename }}

      - name: Upload final video
        uses: actions/upload-artifact@v4
        with:
          name: eApps-promo-video
          path: promo/${{ steps.vid.outputs.filename }}
          retention-days: 90

      - name: Attach to release
        if: github.event_name == 'release'
        uses: softprops/action-gh-release@v2
        with:
          files: promo/${{ steps.vid.outputs.filename }}
          tag_name: ${{ github.event.release.tag_name }}
          fail_on_unmatched_files: false
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}