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The AOMedia Video Codec 1.0 (a.k.a. AV1) is an open, royalty-free codec optimized for UHD video and intended to compete with MPEG's HEVC.
Quoting the YouTube Developers' channel, "support for AV1 in MP4 within Media Source is available in Chrome 70, and Firefox 63 builds newer than September 13 with the media.av1.enabled pref set. Using a supported browser and choosing the 'Prefer AV1 for SD' setting on youtube.com/testtube, you should see AV1 used for these videos when playing less than 480p, switching to VP9 for higher resolutions."
Playlist:
AV1 Beta Launch Playlist - YouTube
Additional info:
- The Alliance for Open Media Kickstarts Video Innovation Era with "AV1" Release
- AV1 - Wikipedia
Quoting the YouTube Developers' channel, "support for AV1 in MP4 within Media Source is available in Chrome 70, and Firefox 63 builds newer than September 13 with the media.av1.enabled pref set. Using a supported browser and choosing the 'Prefer AV1 for SD' setting on youtube.com/testtube, you should see AV1 used for these videos when playing less than 480p, switching to VP9 for higher resolutions."
Playlist:
AV1 Beta Launch Playlist - YouTube
Additional info:
- The Alliance for Open Media Kickstarts Video Innovation Era with "AV1" Release
- AV1 - Wikipedia