Selur's Little Message Board

Hello.

I am trying to encode avi video to mp4 using the av1 codec and notice that when I use SVT-AV1 there is a CRF option but the encoding mode has only 3 options:  1) constant bitrate, 2) variable, and 3) constant quantizer/rate control.   Similarly, aomenc has no enconding option or otherwise that implies no CRF.  

Further, when I run the encoder, I notice in the Jobs tab, that constant quantizer is being used, even when I have CRF on with SVT-AV1 and, as note, there is no CRF with aomenc.

Am I missing something?  How do I use CRF with either of SVT-AV1 or aomenc.

Thank you.

aomenc supports:
cq 'constrained quality' is probably the most similar to crf.

svt-av1 supports:
so using "constant quantizer / rate control" with 'CRF' enabled is what you want, since it sets `--rc 0 --aq-mode 2 --qp x`


Cu Selur

Hmmm, what about aomenc?  How do I select Rate Control Mode?

copilot is telling me that I don't have a full install.  Might this be correct?

Hmmm, what about aomenc?  How do I select Rate Control Mode?

copilot is telling me that I don't have a full install.  Might this be correct?

Like I wrote:

Quote:cq 'constrained quality' is probably the most similar to crf.

Cu Selur

Just for my clarity.  This means that at this point, there is no way to set aomenc or svt-av1 directly as crf.  Is that correct?

Yes, there is no single option with parameter where you set crf xy, but both offer something that can be called 'constant rate factor' encoding, but it is not exactly the same as what x264 and x265 crf implementation, since the formats differ quite a bit.
svtav1, even calls it crf in their documentation.
So I would say using the parameter encoders the way I described, you get crf encoding.

Cu Selur