What is your ultimate aim here? Some kind of obfuscation of clips you already have? Or are you trying to restore a clip that has already had this thing done to it?
mt_makediff, as far as I can tell, will not work properly if the difference between two pixel values is >127 or <-128, which is likely to happen when you have completely different clips. You need something that'll give X = (A-B) modulo 256. Then B = (A-X) modulo 256. (I think that's right but don't take it as definite).
Last edited by wonkey_monkey; 18th February 2019 at 22:38.
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