HandyPebble Video Compressor includes these self-hosted browser packages:

@ffmpeg/ffmpeg 0.12.15 — MIT License
@ffmpeg/core 0.12.10 — GPL-2.0-or-later

Project and corresponding source code:
https://github.com/ffmpegwasm/ffmpeg.wasm

The packages run inside the visitor's browser. HandyPebble does not modify the
FFmpeg WebAssembly core. Package metadata and source availability are provided
by the upstream project at the URL above.