So, now you ask, how do you know which frames are keyframes? But this article goes inside the process used in Kanye's video in good detail:Īn algorithmic approach might be to analyze an MP4 videostream for cuts (where the difference between 2 frames is relatively large), then cut out the surrounding frames. However, by removing the keyframe it's assumptions are now "wrong" and you get the lovely effect. Once the keyframes are gone, there's no reference for the codec, so it just goes along and does what codecs do, which is recalculate the image based on assumptions. As i understand it, it's a matter of removing the frames that serve as keyframes.
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