Criticism
GMC failed to meet expectations of dramatic improvements in motion compensation, and as a result it was omitted from the H.264/MPEG-4 AVC specification - designed as a successor to MPEG-4 ASP. Most of GMC's benefits could be obtained via better motion vector prediction. GMC also represents a large computational cost during encoding which yields relatively minor quality improvements.
Due to the extra decoding CPU cost of global motion compensation, most hardware players do not support global motion compensation.
Read more about this topic: Global Motion Compensation
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—Ben Hecht (1893–1964)
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