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Different MPEG coding strategies
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Strategy Speed Compression Quality
-------- ----- ----------- -------
Increase MV Search Range Down Up Up?
Increasing Q-Scale Same Up Down
Decreasing Q-Scale Same Down Up
Use half-pixel search Down Up Up?
Use pixel subsampling Up Down Down?
Use motion vector subsampling Up Down Down?
Use decoded frame as reference Same Unknown Up?
Varying q-scale Down Up Down
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