name: Install ffmpeg (Linux)
description: >-
  Put a pinned static ffmpeg and ffprobe from BtbN/FFmpeg-Builds on PATH. No
  apt: its mirror has taken up to 10 minutes.

inputs:
  release-url:
    description: >-
      BtbN/FFmpeg-Builds linux64 tarball. Bump the tag, filename and sha256
      together, and keep in sync with the Dockerfiles' FFMPEG pins.
    required: false
    default: https://github.com/BtbN/FFmpeg-Builds/releases/download/autobuild-2026-02-28-12-59/ffmpeg-n8.0.1-66-g27b8d1a017-linux64-gpl-8.0.tar.xz
  sha256:
    description: sha256 of the tarball, from the release's checksums.sha256.
    required: false
    default: 26d2ecd0cefba99f9d1ea92252a3a4f743a58df4c1c3cf9f8bbaaa40b1fca5b0

runs:
  using: composite
  steps:
    - name: Install ffmpeg
      shell: bash
      env:
        URL: ${{ inputs.release-url }}
        SHA256: ${{ inputs.sha256 }}
      run: |
        set -euo pipefail
        archive="$RUNNER_TEMP/${URL##*/}"
        # Two attempts of at most 20 s keep the install under a minute.
        curl -fsSL --retry 1 --retry-all-errors --retry-max-time 25 --connect-timeout 10 --max-time 20 \
          --speed-limit 5000000 --speed-time 10 -o "$archive" "$URL"
        sha256sum -c --quiet <<<"$SHA256  $archive"
        bin="$RUNNER_TEMP/ffmpeg-bin"
        mkdir -p "$bin"
        tar -xJf "$archive" -C "$bin" --strip-components=2 --wildcards '*/bin/ffmpeg' '*/bin/ffprobe'
        echo "$bin" >> "$GITHUB_PATH"
        "$bin/ffmpeg" -version | head -1