ffmpeg

Vertex uses separately built executable ffmpeg.exe for creating some videos.

FFmpeg:
https://ffmpeg.org/

FFmpeg is licensed under GPL v3:
https://www.gnu.org/licenses/gpl-3.0.txt
"This software is based in part on the work of the Independent JPEG Group"

x264 encoder is licensed under GPL v2:
https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt

The source code used in the build:

ffmpeg-4.3.1-x264-stable-20201022-src.7z