Ah yeah I have had this. Basically if moving backwards through a mp4 it gets the frame ordering wrong. My habit is when dropping a mp4 on the timeline I add a colour correct soft effect to force it to cache, then go to the first frame, check play all frames is selected in the play drop down menu, then play. This caches the mp4 correctly in sequence. I always do that when dropping say an mp4 offline in to the time line.
I guess this is only true when working with soft imported mp4s.
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