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3058 Discussions

How does AVBR mode works?

Joyah
Beginner
‎03-22-2012 12:59 AM
1,390 Views
Hi there,
I would like to ask that how does the RateControlMethod "AVBR" (Average Variable BitRate) mode work?
What's the difference of feature and algorithmbetween the " AVBR"and "VBR"(or "CQP")?
If I have multiple input bitstream, is there any way to make the "AVBR" mode to consider the dependency of them and try to adjust the dependency as response?

Thanks and regards,
Joyah
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Nina_K_Intel
Employee
‎03-22-2012 07:10 AM
1,390 Views
Hi Joyah,
Here is a description of AVBR from MSDK reference manual:

Average variable bitrate control (AVBR) algorithm. The algorithm focuses on overall encoding quality while meeting the specified bitrate, TargetKbps, within the accuracy range Accuracy, after a Convergence period. This method does not follow HRD and the instant bitrate is not capped or padded.

The Accuracy value is specified in the unit of tenth of percent.

The Convergence value is specified in the unit of 100 frames.

The TargetKbps value is specified in the unit of 1000 bits per second.

So basically the only difference with VBR is lack of HRD conformance.

Sorry, I don't understand the question about multiple bitstreams, can you explain in more details?

Regards,
Nina
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