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Old 2nd March 2020, 01:49   #2081  |  Link
benwaggoner
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Quote:
Originally Posted by Beelzebubu View Post
I think Youtube is known to do significantly higher bitrates for AV1 than for VP9, so that could be part of why...
Really? Do you have any documentation?

This would be odd since a key point of AV1 is to be able to use lower bitrates than VP9. And as a performance-heavy SW decoder, lower bitrates help performance as well.
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Old 2nd March 2020, 11:31   #2082  |  Link
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Originally Posted by benwaggoner View Post
Really? Do you have any documentation?

This would be odd since a key point of AV1 is to be able to use lower bitrates than VP9. And as a performance-heavy SW decoder, lower bitrates help performance as well.
https://www.reddit.com/r/AV1/comment...be_use_higher/

But i think that is not true anymore. Have seen more mixed results and av1 was most of the time smaller.
Will look, if we can collect data about it once new AV1 encoded videos are available(no new AV1 encoded video since 2020-02-23 in the "Popular Right Now" playlist)

Tracker how many AV1 encoded videos are in the "Popular Right Now" playlist per day
https://htmlpreview.github.io/?https...er/yt-av1.html

Last edited by Toggleton; 2nd March 2020 at 11:38.
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Old 2nd March 2020, 21:11   #2083  |  Link
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AOMedia Member Spotlight with Netflix’s Manager, Android Player Infrastructure, Jeff Watts
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Old 2nd March 2020, 23:51   #2084  |  Link
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I am most excited to see AV1 appear in the mobile chipsets. With hardware support, we can start pushing our AV1 support into higher resolutions. Because we have an AV1 pipeline ready, we are in a good position to help evaluate this hardware as it becomes available. I look forward to sharing our learnings with the first AV1 hardware when it comes out.
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Old 3rd March 2020, 00:48   #2085  |  Link
benwaggoner
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Quote:
Originally Posted by Toggleton View Post
https://www.reddit.com/r/AV1/comment...be_use_higher/

But i think that is not true anymore. Have seen more mixed results and av1 was most of the time smaller.
Will look, if we can collect data about it once new AV1 encoded videos are available(no new AV1 encoded video since 2020-02-23 in the "Popular Right Now" playlist)

Tracker how many AV1 encoded videos are in the "Popular Right Now" playlist per day
https://htmlpreview.github.io/?https...er/yt-av1.html
I can see that making sense. Given how YouTube distributes encoding, it would be hard to run AV1 at higher quality/efficiency levels with libaom. So at the same MIPS/pixel, they may have needed to use a higher bitrate than with vp9 to deliver the higher quality they wanted to with AV1. Which makes sense as their goal was to push AV1, not to use it to deliver lower bitrate or higher quality content overall (then they would have just raised vp9 bitrates).

As we're getting faster and better encoding, I would expect the AV1 bitrates to drop while maintaining quality.
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Old 6th March 2020, 02:02   #2086  |  Link
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Excellent! Good to see more comprehensive 10+ bit optimization being done. This is mandatory for HDR
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Old 10th March 2020, 22:45   #2087  |  Link
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Excellent! Good to see more comprehensive 10+ bit optimization being done. This is mandatory for HDR
Yeah, fast ARM 10-bit will make HDR feasible on 2020 mobile devices. For user generated content at least; premium studio content will still require HW DRM.

It's be nice to have some benchmarks with details beyond "Up to 2.5x faster" - is that only in some edge cases, or is ~2x speedup a practical expectation?
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Old 10th March 2020, 23:21   #2088  |  Link
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The optimizations covered quite a lot of very commonly used functions (MC, Loopfilter, CDEF), so I would expect quite decent improvements for the majority of clips. I believe a proper announcement with example benchmarks is still being worked on.
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Old 11th March 2020, 17:27   #2089  |  Link
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It also brings new AVX-512, AVX2 and SSSE3 optimizations and improves the existing optimizations on all platforms.
Insignificant gains for 8 bit video according to Phoronix for modern CPU architectures.
Probably that's why they didn't announce performance differences from previous versions as they always do.
But huge gains for 10 bit video, as they actually begin optimizations for this colour depth for the first time, starting with this version.
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Old 14th March 2020, 00:32   #2090  |  Link
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I discovered a quirk of aom that might be of interest to some people.

Sometimes keyframes in aom look really bad even in constant quantizer mode and a cq level of 20. Examples: https://slow.pics/c/GaddIUgb

I believe this happens when the encoder looks ahead and sees that the keyframe (or parts of the keyframe) is pretty useless because not a lot depends on it.

You can fix these low quality keyframes, if you want, with --enable-keyframe-filtering=0. Obviously, this will use more bitrate.

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Old 14th March 2020, 17:59   #2091  |  Link
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Netflix - SVT-AV1: an open-source AV1 encoder and decoder
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Old 16th March 2020, 22:19   #2092  |  Link
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AMD's new 7nm zen2 based ryzen 4000 'renoir' laptop chips were announced today, they don't support AV1

image: https://images.anandtech.com/doci/15...e-page-009.jpg
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Old 16th March 2020, 22:53   #2093  |  Link
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Zen2 based...
Also AMD is always slow on HW codec, or instructions.

Is much more important on the next mobile SoC.

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Old 17th March 2020, 00:01   #2094  |  Link
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Originally Posted by marcomsousa View Post
Zen2 based...
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Zen 2 based doesn't require them to use any specific video decode block. They can release zen 2 chips with a newer video decode block that can decode av1.
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Old 17th March 2020, 05:07   #2095  |  Link
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Zen 2 based doesn't require them to use any specific video decode block. They can release zen 2 chips with a newer video decode block that can decode av1.
Unlikely, the 'Renoir' 4000 series APU with Zen2 cores is likely to be the last major design with Zen2, with following low cost and embedded designs likely to be derivative.

It seems likely that the Zen3 based Cezanne APU (like 5000 series) will have AV1 decoding blocks, perhaps maybe the new discrete GPU's expected later this year too.
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Old 17th March 2020, 09:30   #2096  |  Link
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Media features are typically part of the GPU, not the CPU, as such Zen2 or Zen3 wouldn't make the key difference, but the Vega graphics on them would - which isn't even RDNA yet, so its rather old.
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Old 17th March 2020, 12:31   #2097  |  Link
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Renoir SoC has a special version of Vega at 7nm that has borrowed multimedia engine from Navi aka RDNA.

We have to actually run DXVAChecker to see real features and decoding speed.
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Old 17th March 2020, 18:39   #2098  |  Link
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OnePlus 8 Lite will support AV1 HW decode.

The normal or the PRO version doesn't because Qualcomm do not support it.



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Old 18th March 2020, 10:51   #2099  |  Link
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What is Qualcomms deal at this point?
Are they silently preparing another Patent Pool for AV1 like Sisvel, or are they just lazy and indecisive
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Old 18th March 2020, 18:31   #2100  |  Link
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new macbook air has been released, it uses a 10th gen intel processor, no info about AV1 decoding or not: https://www.apple.com/uk/macbook-air/specs/
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