Quote:
Originally Posted by mushahidh
Not actually. Again to be more clear. For example I have IPPP structure and GOP contains 30 frames. And as we know first I frame is much more important than P frames so i will give more priority to first I frame. Then for remaining P frames initial P frames are more important than last P frames. So on what basis can i define a threshold so that i can say initial 25% percent P frames are much important that last 25% of frames?
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This is called "rate control" and "frame type decision". Every (halfway decent) video encoder does this by default
You only need a
--qpfile option (or ROI encoding), if you want to overwrite the encoder's rate control and/or frame type decisions, in some specific places.
See also:
*
http://git.videolan.org/?p=x264.git;...atecontrol.txt (a bit outdated, but still gives the idea)
*
https://web.archive.org/web/20120910...cx/archives/98