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What advantages gives adaptive quantization... - Printable Version

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RE: What advantages gives adaptive quantization... - Peter82kr - 16.05.2018

What flow controll i need to set to achieve fluctuating bitrate?I tried vbr and cbr and bitrate not fluctuating. Sad

RE: What advantages gives adaptive quantization... - Selur - 17.05.2018

Bitrate should fluctuate throughout the stream independent of the rate control.
Even cbr should only be constant over a second and should fluctuate per frame.
I don't think NVEnc is capable to 'fake' total cbr through bitrate stuffing.

Cu Selur

RE: What advantages gives adaptive quantization... - Peter82kr - 17.05.2018

I set constant bitrate 1520kbits/s (not HQ like earlier) and now bitrate minimum value is 400kbit/s on begginning video and 1000kbit/s in middle.It seems that aq is not compatible with 2pass encoding like constant quantizer.

RE: What advantages gives adaptive quantization... - Selur - 17.05.2018

Quote:I set constant bitrate 1520kbits/s (not HQ like earlier) and now bitrate minimum value is 400kbit/s on begginning video and 1000kbit/s in middle
My point. cbr is only constant in regard to VUI settings.

Quote:It seems that aq is not compatible with 2pass encoding like constant quantizer.
What? 2pass encoding? NVEnc doesn't have 2pass encoding.
+ 2pass encoding in general doesn't make any sense with constant quantizer encoding. Since if the quantizer is constant there is nothing a 2pass encoding could optimize,...
-> you are clearly mixing up some stuff here

Cu Selur

RE: What advantages gives adaptive quantization... - Peter82kr - 18.05.2018

Thanks for explanation.