Hi, i found a "nonfree" ffmpeg that seems to overcome some of the limitations of the official classic ffmpeg.....maybe be it can help the project :
Automated nonfree builds of FFmpeg for Windows using GitHub Actions:
https://github.com/AnimMouse/ffmpeg-autobuild
https://www.animmouse.com/projects/ffmpeg-autobuild/
other builds of FFmpeg built by others :
https://www.animmouse.com/p/ffmpeg-binaries/