Support infinite keyint (--keyint infinite).
This just means x264 won't insert non-scenecut keyframes. Useful for streaming when using interactive error recovery or some other mechanism that makes keyframes unnecessary. Also change POC logic to limit POC/framenum LSB size (to save bits per slice). Also fix a bug in the CPB underflow detection code (didn't affect the bitstream, just resulted in the failure to print certain warning messages).
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