This is why I also suggested a fallback in case it lands up in the same frame, but yes, it also needs checking that the next frame is indeed the original frame.

This is why I also suggested a fallback in case it lands up in the same frame, but yes, it also needs checking that the next frame is indeed the original frame. I expect it to work unless the frame rate is wildly varying, e.g. 60 fps and 60 spf in the same video. I guess one reasonable use case would be video that's triggered by motion, though. It would still work for almost every video.