I have two (or more) video files that I want to play side by side. I could do that simply by opening them in two seperate windows, but that would also seperate all the controls (play/pause/forward/...). I want to play them in a synchronized fashion so that pause/forwarding/... works on both videos simultaneously so that they always stay at the same timecode and they don't go out of sync. How would I accomplish that in Linux?
This is needed for viewing only, so compositing them into a new video file first should be avoided if possible, but if there isn't an easy way to do that, I welcome answers doing it with composition as well.