As can be seen from the images, the bottom (motion compensated) difference between two frames contains significantly less detail than the prior images, and thus compresses much better than the rest.

MPEG

In MPEG, images are predicted from previous frames ([[Video compression picture types or bidirectionally from previous and future frames ([[B frames]]). B frames are more complex because the image sequence must be transmitted and stored out of order so that the future frame is available to generate

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