Sphot serves these files unmodified as a fallback video encoder that runs in your browser.

core-mt/  @ffmpeg/core-mt 0.12.10 (FFmpeg compiled to WebAssembly, includes libx264)
          License: GNU General Public License v2.0 or later (LICENSE-GPL-2.0.txt)
ffmpeg/   @ffmpeg/ffmpeg 0.12.10 (JavaScript wrapper), License: MIT

Source: https://github.com/ffmpegwasm/ffmpeg.wasm (build scripts pinning the FFmpeg and x264 sources).
Written offer: for at least three years after we last distribute this build, SPHOT (OPC) PRIVATE
LIMITED will provide the complete corresponding source code for it on request to support@sphot.one,
for a charge no more than the cost of physically performing the distribution.