Convert4Freee - third-party media components

@ffmpeg/ffmpeg 0.12.15, copyright 2019 Jerome Wu. MIT license.
License: /vendor/ffmpeg/LICENSE
Source: https://github.com/ffmpegwasm/ffmpeg.wasm/tree/v12.15/packages/ffmpeg

@ffmpeg/core 0.12.10 (unmodified single-thread WebAssembly binary).
GPL-2.0-or-later; includes FFmpeg and codec libraries under their respective licenses.
License: /vendor/ffmpeg-core/LICENSE
Source archives hosted with this distribution: /vendor/source/
Source and reproducible build instructions:
https://github.com/ffmpegwasm/ffmpeg.wasm/tree/v12.15
https://github.com/ffmpegwasm/ffmpeg.wasm/blob/v12.15/Dockerfile
FFmpeg: https://ffmpeg.org/
x264: https://www.videolan.org/developers/x264.html
libvpx: https://chromium.googlesource.com/webm/libvpx/
Opus: https://opus-codec.org/
No modifications have been made to these vendored distributions.