I have reviewed all FMs with non-ROQ video files.
Among ~10 instances, all of them use the same format: mp4 + h264 + aac.
I must admit it is rather expected.
All the other supported formats (avi, mpeg4, mp3) are simply older/worse incarnations of this "most used trinity": there is no sane reason to use them.
The only purpose which comes to my mind is troubleshooting, but I think after several years and with 10 FMs released without serious complaints, I think there is no trouble with t