ffmpeg.wasm, copied unchanged from npm.
@ffmpeg/ffmpeg 0.12.15 (MIT), files in ffmpeg/
@ffmpeg/core 0.12.10 (GPL-2.0-or-later), files in core/
The core is FFmpeg with x264, x265, libvpx and others, compiled to WebAssembly.
Source: https://github.com/ffmpegwasm/ffmpeg.wasm/tree/v0.12.10
Licence texts: https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt and https://opensource.org/license/mit