Independent playable files
So, multifilesink is able to create multiple files but not able to play each of them. It would be nice if multifilesink could do this. multifilesink is nice because it can save multiple video streams to a file, unlike splitmuxsink. splitmuxsink can create independent playable files, but only with a single video stream.
I propose that it should be possible to create individual playable chunks with multiple video streams at once.