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> We have seen great growth in the use of AV1 even in just a few months, with our latest figures showing that 11.8% of video playback in Firefox

Where are people playing AV1 videos?

YouTube released an AV1 playlist long ago, and haven't added a single video since release: https://www.youtube.com/playlist?list=PLyqf6gJt7KuHBmeVzZteZ...

Besides that, I've only seen a few in the wild.

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Youtube has more AV1 videos than that playlist. My fav Youtuber has AV1 videos in 720p and it's not a huge channel.

How do I tell if a given video playing in my browser is AV1 or something else?

Right click the video and choose Stats for Nerds. If Codecs shows something starting with "av01", it's AV1 (confusingly, av1c is H.264). It seems to be chosen for nearly every video for 480p or below, and a few for higher resolutions.

Do you still need to opt in on YouTube for this?

It does seem YouTube has AV1 videos, at least for lower resolutions (720p and lower)

I've even found some in 5k, although they don't play back hardly at all. Performance not there yet.

That should be markedly better in Firefox 67, since we've just now switched to dav1d, a much more efficient decoder by the VideoLAN folks. Prior to that, we were using the reference implementation from libaom.

This is a huge enhancement, thank you!

I'm on FF nightly, dav1d enabled.

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