build.yml

# build.yml: Build FFmpeg binaries.
#
name: 'Build FFmpeg'

on:
  workflow_dispatch:

jobs:

  build:
    name: 'Build FFmpeg'
    runs-on: ${{ matrix.os }}
    continue-on-error: true

    strategy:

      matrix:

        name: [
          alpine-arm32v7,
        ]

        include:

          # Build for arm v7 32-bit Linux environments.
          - name: alpine-arm32v7
            os: ubuntu-latest
            BASE_IMAGE: arm32v7/alpine:latest
            DOCKERFILE: linux
            EMULATE_ARCH: arm
            TARGET_ARCH: arm32v7
            TARGET_OS: alpine
    steps:
    - uses: actions/checkout@v3
    - name: 'Caching workspace.'
      id: cache
      uses: actions/cache@v3
      with:

        path: build
        key: ${{ matrix.name }}-cache

    # Docker image build.
    - name: 'Docker: creating the build image.'
      if: runner.os == 'Linux'
      run: |

        # Configure QEMU to register handlers for our target architectures.
        docker run --rm --privileged multiarch/qemu-user-static:register --reset

        # Build the image that will become our build environment.
        docker build --build-arg BASE_IMAGE=${{ matrix.BASE_IMAGE }} --build-arg EMULATE_ARCH=${{ matrix.EMULATE_ARCH }} -f Dockerfile.${{ matrix.DOCKERFILE }} -t ffmpeg-builder-${{ matrix.name }} .

    # Docker image build.
    - name: 'Docker: building the FFmpeg binary.'
      if: runner.os == 'Linux'
      run: |

        mkdir -p build

        # Start the build environment for our requested target.
        docker run -v $(pwd)/build:/build -e TARGET_OS=${{ matrix.TARGET_OS }} -e TARGET_BUILD_ARCH=${{ matrix.TARGET_ARCH }} ffmpeg-builder-${{ matrix.name }}

        # Fix any permissions issues that may have arisen due to containerization.
        sudo chown -R $USER:$USER build

    # macOS Builds.
    - name: 'macOS: building the FFmpeg binary.'
      if: runner.os == 'macOS'
      run: |

        mkdir -p build

        # Execute the build script.
        cd build && SKIPINSTALL=yes VERBOSE=yes ../build-ffmpeg --build --enable-gpl-and-non-free

    # Package our binaries for non-Windows operating systems.
    - name: 'Linux and macOS: packaging the binary.'
      if: matrix.DOCKERFILE != 'windows'
      run: |

        mkdir -p package/usr/local/bin/

        # Emulate the filesystem hierarchy so it's easily discoverable in a user's path environment variable.
        cp build/workspace/bin/ffmpeg package/usr/local/bin/ffmpeg

        # Now we package it all up.
        tar -C package -zcvf ffmpeg-${{ matrix.name }}.tar.gz .

    # Package our binaries for Windows.
    - name: 'Windows: packaging the binary.'
      if: matrix.DOCKERFILE == 'windows'
      run: |

        # Copy the binary we're looking for and we are done.
        cp build/ffmpeg.exe .

    # Upload the packaged asset as an artifact.
    - name: 'Uploading the packaged asset.'
      uses: actions/upload-artifact@v3
      with:

        name: ffmpeg-${{ matrix.name }}
        path: |

          ffmpeg-${{ matrix.name }}.tar.gz
          ffmpeg.exe