Differences between MFX_RATECONTROL_VBR and MFX_RATECONTROL_AVBR

[Mariano_Quesada]

Hello, I don't find differences betweenthe behavior of MFX_RATECONTROL_VBR and MFX_RATECONTROL_AVBR. I have tested both of them and the size and quality of files are similar. I thought that the Average bitrate control could increment the file size in order preserve the quality of the image.

Please, could anyone tell me the difference?

Thank you in advance.

[Anthony_P_Intel]

Hi,

THe observed difference between the two will depend on the actual bitrates used. If you are working with low bitrates, you should see a difference, but if your using higher bitrates, the difference in filesize (and quality) would be simular. Also the differnece would more noticable onframes with abrupt/spontaneous movement.

In general MFX_RATECONTROL_AVBR is equal or better average quality than MFX_RATECONTROL_VBR, and is best at producing a predictable filesize, but there are many occations where both methods produce very simular results.

-Tony