[clouddrover]

I tried it out in Firefox 65 beta. You can enable dav1d via about:config by setting "media.av1.use-dav1d" to true.

dav1d seems to perform worse than libaom for me on some videos I tried. I have a 2014 MacBook Pro with a 2.2ghz Haswell i7 (i.e. with AVX2).

Firefox using libaom struggles to play YouTube AV1 video at 1080p60 on my system. It gets to a point where it drops too many frames and the video becomes unwatchable. For example:

https://www.youtube.com/watch?v=Fmdb-KmlzD8

I hoped dav1d would perform better than libaom on that particular video at 1080p60, but if anything it performs worse.

I'm not clear if that video is 8-bit or 10-bit color. If it's 10-bit color then that would explain it because dav1d is not optimized for 10-bit video yet.

[jbk]

> dav1d seems to perform worse than libaom for me on some videos I tried.

As far as I know, the Firefox buildsystem does not compile dav1d with asm yet. So, that is expected, for now.

[clouddrover]

Ah, that explains it then. Thanks.

Hopefully they'll enable the asm code during Firefox 65 beta.