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How do one automatically/easily create a "before-after" comparison of two video file, where one file is the transcoded version of the other, in terms of several still images? Each pair would be created from the frame(s) at the same time code (not necessarily the same frame no.)

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Have you come up with something already? What does "several" mean? Should that depend on the length of the video? –  slhck Nov 4 '12 at 21:15
    
For practical reasons, "several" would be better as a fix number. However, the best would be an option for either use a fix number or use a trigger (like "take picture in every 5 minutes", or sg. more sophisticated). –  naxa Nov 4 '12 at 21:22
    
@slhck I have no solution yet, I've included the ffmpeg tag only in hoping that the great video swiss knife could solve it. –  naxa Nov 4 '12 at 21:28
    
Do you have a specific operating system in mind? –  slhck Nov 4 '12 at 21:38
    
@slhck I currently use windows XPprosp3x32 and 7prox64, but any debian-based distro is also OK. –  naxa Nov 4 '12 at 21:43

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