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Old 17th August 2005, 21:39   #10  |  Link
TheBashar
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Join Date: Jan 2002
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Bitrate Variance Question

Hi Sharktooth,

I understand that your AVC matrices are intended for bitrates of around 1350kbps for 720x430 "average motion" movies. From following some of your XviD matrices development, I believe I recall that the matrices are "tuned" for the target bitrate/resolution ratio and perform sub-optimally on lower bitrate/resolution ratios.

Getting (slowly) to my question... will the matrices perform sub-optimally in regions of an encode where due to a default curve compression (qcomp = 0.6 in x264) bitrates are reduced because of slow/no motion detection? For instance, I may have an encode which averages 1350kbps but a particular scene may have only 800 kbps allocated due to it being a static scene. Will these matrices perform poorly in such regions solely becuase of the low bitrate or will they still perform as expected since in fact there is little or no motion?

The reason I ask is because I am considering unbridling the qcomp by significantly raising the ratetol from its default of 1.0.

Thanks for your time!
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