Quote:
Originally Posted by benwaggoner
I’m having a hard time figuring out what settings they are actually using. It sounds like it’s fixed QP [..] And really QP instead of CRF?
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The paper says they use CRF for x264/5. I would recommend reading the paper if you want to know all the details, it's pretty detailed.
Quote:
Originally Posted by benwaggoner
And odd libvpx gets to use 2 passes while everything else is 1. Although that wouldn’t really matter that much if it’s truly a fixed QP encode with no rate control.
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The reason people don't use 1-pass CRF in libvpx is because it's pretty broken. Try it. Several bitstream (!!) features get *completely disabled* (!!) when using 1-pass encoding using libvpx. So you get several % BDRATE quality improvements when switching from 1-pass to 2-pass CRF.