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Looks like this is going to be my next project. Another scripter is interested too. Our problem is capture cards which create freezeframes (dupped frames) and then drop frames a little after. The problem is to fix a video by automatically detecting missing frames and interpolating them, and also remove dupped frames. A further problem is to synchronize n videos (up to 5!) frame-by-frame.
You gave me a lot of ideas to think about.
It looks like dup, dedup, and getdubs all output a log file which could be used, so it would have to be two pass for now unfortunately. In my case I have even worse problems, the noise is extreme and always different on each copy/frame, so I might need to compare only pixels that are good with a mask (it's little white lines on the video which I can detect).
by correlation I mean pearson's coeficient, you can't calculate that in script with mvtools. It's immune to brightness, contrast, and order of pixels, and gives the best expectation in the presense of white noise.
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