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...an treat it as a special case. Other artifacts that come to mind are: * 3-2 Pull down * 30/25 and 25/30 FPS conversion artifacts * Dropouts, (both noisy, a-la VHS, and solid bars, a-la BetaSP, (which I believe halves the chroma resolution - can we possibly take this in to account as well?) ) * Stobe effect of a CRT filmed by a different scan-rate camera * Colour changes in multi-layered painted cel animation, (where a character is, say, talking, and they repeatedly add and remove a cel from the top layer, their face flashes bright and dark :-) ) Infact, existing video compression codecs do a...