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Old 30th May 2019, 22:28   #1698  |  Link
benwaggoner
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Join Date: Jan 2006
Location: Portland, OR
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Quote:
Originally Posted by sneaker_ger View Post
I'm not judging, just saying how it is. People see the advertisement for the new shiny codec and can't wait to profit from "50% less bitrate". They need to reduce their hopes. As you say AV1 today isn't for them and maybe never will. Of course I wouldn't mind to be proved wrong in the future.
We have seen 50% improvements generation-to-generation with the MPEG codecs. But that's at the same point of development. An HEVC enocoder with seven years of refinement isn't going to be only half as good as a VVC reference implementation. But comparing HEVC encoders seven years after spec freeze to VVC seven years after code freeze probably will show ~50% bitrate savings. Some content will even be more. Film grain synthesis could result in 75% reduction in some of the most difficult content, for example.

AV1 wasn't ever promised to be more than 20% better, and even that was in mean PSNR, not psychovisually. AV1 encoders haven't demonstrated any advantage over HEVC with subjective quality, even with the reference encoders.

The VPx code base started VERY heavily PSNR-tuned, which may be way it does well with that today. I don't have any reason to think that is a limitation of the AV1 bitstream versus just the libaom encoder.

But the general case of "AV1 can deliver the same subjective quality at meaningfully lower bitrates than HEVC" has yet to be demonstrated.
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