YouTube starts delivering videos in AV1 format

On September 12, 2018. YouTube published the AV1 Beta Launch Playlist with the first 14 videos that received YouTube's AV1 transcodes.

Support for AV1 is available in Chrome 70 and Firefox Nightly builds newer than September 13.

To enable AV1 in Firefox, in "about:config", "media.av1.enabled" and "media.mediasource.experimental.enabled" needs to be set to "true".

To receive AV1 format YouTube videos, on the web-page youtube.com/testtube, "Prefer AV1" needs to be selected.

There are up to 1080p AV1 video available. Playing 1008p in Firefox takes approximately 25% CPU usage of a 4 core Intel Core i5 CPU.

Youtube says that more AV1 transcoded videos are coming soon.

AOMedia Video 1 (AV1), is developed to be the successor of VP9. It is an open, royalty-free video coding format designed for video transmissions over the Internet.


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