Alliance for Open Media codecs

[benwaggoner]

Do we have any info about Intel's quality, or quality @ perf?

[Blue_MiSfit]

I haven't seen anything yet, but am eagerly looking forward to getting some of this info.

[rwill]

Yeah, I wish someone at a company that could use this info professionally would investigate.

[GTPVHD]

https://www.igorslab.de/en/intel-met...neration-leak/
https://www.igorslab.de/wp-content/u.../07/MTL-01.png

Leaked slide confirms Intel Meteor Lake have low power AV1 hardware encoder.

https://lists.freedesktop.org/archiv...ly/301011.html

Meteorlake is a new client platform following RPL S. Meteorlake
introduces version 14 for Display, version 13 Media and version
12.70 for Graphics.

[OrangeColaJuice]

https://twitter.com/Loeschzwerg_3DC/...95162670338049
https://twitter.com/Loeschzwerg_3DC/...05297425829889
Someone who got his hands on an a380 doing some encodings.

[hajj_3]

AVIF support is going to be in safari on macosx and ios16: https://www.cnet.com/tech/mobile/app...web-on-ios-16/

[ChaosKing]

Originally Posted by OrangeColaJuice

https://twitter.com/Loeschzwerg_3DC/...95162670338049
https://twitter.com/Loeschzwerg_3DC/...05297425829889
Someone who got his hands on an a380 doing some encodings.

For the AV1 encode (hevc 380.93 fps)
encoded 11708 frames, 334.49 fps, 2418.42 kbps, 140.64 MB
encode time 0:00:35, CPU: 51.6, GPU: 48.1, VD: 74.9

I hope the slower preset gives much better quality

[LigH]

New uploads: (MSYS2; MinGW32 / MinGW64: GCC 12.1.0)

AOM v3.4.0-196-g68a071086

rav1e 0.5.0-ga0328612

dav1d 1.0.0-45-ga029d68

avif 0.10.1_3c12bb6
dav1d [dec]:1.0.0-45-ga029d68, aom [enc/dec]:3.4.0-196-g68a071086, rav1e [enc]:0.5.0 (p20220726-8-g9c4b2972)

SVT-AV1 v1.1.0-157-g8db44adf

[Yups]

Intel's WORLD FIRST GPU AV1 encoder was worth the hype

https://youtu.be/ctbTTRoqZsM


Very good AV1 result from the Arc A380 in this test.

[ChaosKing]

Finally the one area the arc gpus are good at ^^"

[Mr_Khyron]

SSIM Comparison for Intel Arc A380 QSV
https://rigaya34589.blog.fc2.com/blog-entry-1501.html

[Yups]

Originally Posted by Mr_Khyron

SSIM Comparison for Intel Arc A380 QSV
https://rigaya34589.blog.fc2.com/blog-entry-1501.html

It's struggling at higher bitrates. Unfortunately he only tested ICQ and didn't check out CBR/VBR/CQP as well as MBBRC and ExtBRC, MB or Ext BRC can sometimes improve the quality.

He says HEVC and H264 encoder on Arc improved over ADL-S iGPU by the way.

It remains to be seen if AV1 QSV can improve over software improvements. oneVPL AV1 support looks rough at the moment.


EposVox made a mistake by not choosing the same gop length in his test, Intel AV1 QSV has a 1s seeking in his samples, means he uses a gop length of 60 (videos are 60 fps). VCE, Intel h264, x264 have a 10s seeking in his encoded videos. As for Intel h264 or h265 QSV a gop increase from 60 to 600 gop should improve the VMAF score by roughly 1 point.

Intel hardware AV1 performs really good at 3500 Kbit relative to the others in this test. It's a blocky mess in motion on NVENC or Intel h264. On higher bitrates Intel AV1 QSV detail preservation is quite poor, that's why it's losing relative to the others at higher bitrates.

Here is a frame example at 3500Kbit

Intel H264 QSV
Nvidia H264 NVENC
AMD H264 VCE
Intel AV1 QSV
x264 very slow

[benwaggoner]

Originally Posted by Yups

It's struggling at higher bitrates. Unfortunately he only tested ICQ and didn't check out CBR/VBR/CQP as well as MBBRC and ExtBRC, MB or Ext BRC can sometimes improve the quality.

And average SSIM is not a particularly well subjectively correlated metric, particularly for HDR.

It remains to be seen if AV1 QSV can improve over software improvements. oneVPL AV1 support looks rough at the moment.

It's been well over a decade since any HW or even GPU-based encoding quality/efficiency wasn't notably worse than the best available software encoder, and the gap has been increasing as codecs get more complex. With so many modes available, making lots of tight loops with low-latency feedback and early exits is key to performance, and the waterfall processing style of GPU and fixed-function implementations harms quality much more than the theoretical performance edge helps. And a modern CPU with lots of cores and power AVX2+ SIMD can do lots of GPU-style encoding all in the same L3 cache.

HW encoders get used when watts/encode is really constrained, hard realtime is required, or for applications where bitrates aren't particularly constrained, like mezzanine encoding.

EposVox made a mistake by not choosing the same gop length in his test, Intel AV1 QSV has a 1s seeking in his samples, means he uses a gop length of 60 (videos are 60 fps). VCE, Intel h264, x264 have a 10s seeking in his encoded videos. As for Intel h264 or h265 QSV a gop increase from 60 to 600 gop should improve the VMAF score by roughly 1 point.

And can vary quite a bit with content type.

Intel hardware AV1 performs really good at 3500 Kbit relative to the others in this test. It's a blocky mess in motion on NVENC or Intel h264. On higher bitrates Intel AV1 QSV detail preservation is quite poor, that's why it's losing relative to the others at higher bitrates.

I think we're looking at the graphs differently. I see QSV on 12900 HEVC beat all other contenders by a healthy margin in both 8-bit and 10-bit. It was also the slowest option, so not exactly apples-to-apples. For "quality" all HEVC and most H.264 options beat the Arc AV1; the one exception being 12900 H.264 FF. Some chunk of that is from the GOP duration mismatch, of course.

Or maybe I'm looking at the data weird. It seems ARC HEVC normal beats quality, which I would not expect.

[Yups]

Originally Posted by benwaggoner

I think we're looking at the graphs differently. I see QSV on 12900 HEVC beat all other contenders by a healthy margin in both 8-bit and 10-bit.

You just misread my posting. There is no HEVC comparison in the test made by EposVox. This part is not related to the rigaya test.

https://youtu.be/ctbTTRoqZsM

[rwill]

Originally Posted by Yups

Intel's WORLD FIRST GPU AV1 encoder was worth the hype

https://youtu.be/ctbTTRoqZsM


Very good AV1 result from the Arc A380 in this test.

Are we looking at the same graphs ?

If I am looking at the ones at 11:50 I think, well, looks like Intel's GPU is getting beaten by a large margin compared to the Intel software encoder set to realtime mode. Also looks like H.264 cannot keep up at 3500k due to higher bitstream overhead but this normalizes out somewhat at 6000k. Only 3 sample points for a graph are suboptimal too, I'd have used 5+. Also keep in mind, H.264 is 20 years old and 1080p@60hz with 3500k comes out to ~1600k at 24hz for non motion blurred content.

Hardly what I would call 'worth the hype' but I made no flashy YouTube video about yet to deliver my opinion to my followers.

[GTPVHD]

https://www.asrock.com/Graphics-Card...C/index.us.asp
https://www.newegg.com/asrock-arc-a3...82E16814930076

Intel Arc A380 will be available soon in US, hopefully someone can test the AV1 hardware encoder.