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Old 7th March 2019, 17:57   #1530  |  Link
benwaggoner
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Join Date: Jan 2006
Location: Portland, OR
Posts: 4,750
Quote:
Originally Posted by lvqcl View Post
Some time ago I was able to download "Childish Gambino - Feels Like Summer" (https://www.youtube.com/watch?v=F1B9Fk_SgI0) in 1080p AV1 format; now its max. available resolution for AV1 is 720p.

Maybe 1080p AV1 is just too heavy to decode.
It would have been in many cases. Perhaps it'll come back when Chrome has a highly optimized decoder.

Also, the CPU requirements for encoding 1080p are 2.5.x that for 720p. Perhaps quality compromises were made to get publishing time to be reasonable that reduced competitiveness, or there were limits on available encoder capacity?

A 1080p H.264 encode takes >>100x less compute than a 1080p AV1. Even Google only has so much free CPU capacity in a day.

Encoder performance improvements plus better quality/speed tradeoff modes will change things dramatically. With continued strong development at the current pace, we could potentially have encoders that can provide better quality than x264 at the same bitrate and encoding time by late 2020. That encoder wouldn't even try to do 99.9% of the stuff that libaom tries to do, but real encoders don't try exhaustive searches, but use lots of heuristics and early exits.
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Ben Waggoner
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