1) Most importantly I would like TimedMediaHandler to have a "loop" video option for making short video clips (say it's just 15-20 seconds) loop automatically when they are played.
2) It would be nice to be able to set a video size of 100% instead of pixels and have it resize to whatever size the screen/browser is using. Should of course also work if the browser is resized after playbacks begun.
3) Unrelated, uploading a MP3 with 44.1k audio makes TimedMediaHandler specify 44.1k when converting to Opus which fails since it's a 48k format. That's a bug.
4) I also find it very annoying that if I upload a 1080p VP9/Opus webm TimedMediaHandler will convert the file to that same format in addition the other formats. A check to see if the file's already in the target format would be preferable and reduce server load.