FFmpeg WebAssembly core 0.12.10: GPL-2.0-or-later, unmodified official npm distribution.
JavaScript wrapper 0.12.15: MIT, see WRAPPER-LICENSE.txt.
Build source and dependency versions: https://github.com/ffmpegwasm/ffmpeg.wasm/tree/71aa99d37c02a7b4c435275ca9ef50e612f6efa1
FFmpeg source: https://github.com/FFmpeg/FFmpeg/tree/n5.1.4
Core build configuration: https://github.com/ffmpegwasm/ffmpeg.wasm/blob/71aa99d37c02a7b4c435275ca9ef50e612f6efa1/Dockerfile
License: see GPL-2.0.txt.