Open Bug 1836790 Opened 11 months ago Updated 5 days ago

AV1 8K 60fps decoding low performance with intel 11gen xe graphics card

Categories

(Core :: Graphics: WebRender, defect, P2)

Product:
Core
Component:
Graphics: WebRender
Version:
Firefox 113
Type:
defect

Tracking

()

Status:
UNCONFIRMED

People

(Reporter: 313432541, Unassigned)

References

(Blocks 1 open bug)

Details

Attachments

(2 files)

about:support
50.43 KB, application/json
Details
about.support.json
45.27 KB, application/json
Details

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/113.0

Steps to reproduce:

environment:
intel nuc11
cpu: i5 1135g7
windows 10 21H2
AV1 video extension 1.1.52851.0

Playing AV1 8K 60fps online video: https://www.youtube.com/watch?v=zCLOJ9j1k2Y
Or download it locally and open it with Firefox

Actual results:

Firefox's GPU video decode usage is same as chrome, but Firefox visually drop frames
(no need to care Youtube webpage "stats for nerds", because it differs from human vision)

Expected results:

Playing AV1 8K 60fps video drop less frames with GPU supports hardware decode

The Bugbug bot thinks this bug should belong to the 'Core::Graphics' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Component: Untriaged → Graphics
Product: Firefox → Core

playing 4k youtube online videos in fullscreen also drop frames

(In reply to 313432541 from comment #2)

playing 4k youtube online videos in fullscreen also drop frames
sample:
https://www.youtube.com/watch?v=pjD0UT-Bfok

Could also you please attach your about:support output to this report? I will update the priority/severity when that has been reviewed.

Severity: -- → S3
Component: Graphics → Graphics: WebRender
Priority: -- → P2

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Attached file about:support —

(In reply to Bob Hood [:bhood] from comment #4)

Could also you please attach your about:support output to this report? I will update the priority/severity when that has been reviewed.

(In reply to 313432541 from comment #2)

playing 4k youtube online videos in fullscreen also drop frames

seems fixed at 115.0.2

(In reply to 313432541 from comment #7)

(In reply to Bob Hood [:bhood] from comment #4)

Could also you please attach your about:support output to this report? I will update the priority/severity when that has been reviewed.

(In reply to 313432541 from comment #2)

playing 4k youtube online videos in fullscreen also drop frames

seems fixed at 115.0.2

but AV1 8K 60fps decoding frame rate is still lower.

Would you be able to take a firefox profile and share the URL for it while playing an 8k video on your hardware? There are instructions for using it at https://profiler.firefox.com/, and you'll want to select the Graphics preset mode.

Flags: needinfo?(313432541)

(In reply to Glenn Watson [:gw] from comment #9)

Would you be able to take a firefox profile and share the URL for it while playing an 8k video on your hardware? There are instructions for using it at https://profiler.firefox.com/, and you'll want to select the Graphics preset mode.

https://profiler.firefox.com/from-browser/calltree/?globalTrackOrder=g0wf&hiddenGlobalTracks=124we&hiddenLocalTracksByPid=840-01~4424-0~8304-0~8888-0~13060-0~9160-13w9&thread=5&v=9

frame rate will be higher when performance analysis started ; frame rate go down again when performance analysis closed.

Flags: needinfo?(313432541)

(In reply to Glenn Watson [:gw] from comment #9)

Would you be able to take a firefox profile and share the URL for it while playing an 8k video on your hardware? There are instructions for using it at https://profiler.firefox.com/, and you'll want to select the Graphics preset mode.

https://share.firefox.dev/43mChxI

Thanks. Unfortunately it looks like that profile has screenshots enabled and is therefore dropping to the non-native compositor implementation, so I don't think this profile will give us useful information (as without the profiler running you should be getting native DirectComposition mode).

Markus, it looks like the Graphics preset was enabled (I'm assuming from the threads sampled), so I would expect no screenshots to be taken (and DC to be enabled). Any idea why that doesn't seem to be the case here, and if it's a profiler setting issue or some kind of profiling regression?

Flags: needinfo?(mstange.moz)

I don't think this profile used the "Graphics" preset. I think it probably just used the "Firefox" preset.

Reporter, could you switch to the "Graphics" preset in the profiler panel, and gather a new profile?

Flags: needinfo?(mstange.moz) → needinfo?(313432541)

(In reply to Markus Stange [:mstange] from comment #13)

I don't think this profile used the "Graphics" preset. I think it probably just used the "Firefox" preset.

Reporter, could you switch to the "Graphics" preset in the profiler panel, and gather a new profile?

https://share.firefox.dev/3pLp8k6

Flags: needinfo?(313432541)

That profile suggests that we're spending most of the time waiting on the Intel driver to do something with the video frames (see mozilla::wr::DCSurfaceVideo::CallVideoProcessorBlt and the related trace in the profile). Normally I'd assume that this means it's simply hardware limited in how fast it can decode that video, but I think you mentioned above that it's better in Chrome? Sotaro, any ideas from the profile in comment 14? Is this something for the graphics team or perhaps the media team to look at?

Flags: needinfo?(sotaro.ikeda.g)

The problem usually happens when GPU tasks are heavy. Hardware decoded video rendering is very different between Chrome and Firefox. For compositing, Chrome seems to use less GPU than Firefox.

And for video decoding, Chrome uses Windows low level video decoding API

Firefox uses Windows high level video decoding API

https://share.firefox.dev/3pLp8k6

From the profile, the wait happened at CDXGISwapChain::AcquireBuffer(). The problem might be mitigated when video swap chain uses triple buffering. The video swap chain uses double buffering.

(In reply to Sotaro Ikeda [:sotaro] from comment #16)

From the profile, the wait happened at CDXGISwapChain::AcquireBuffer(). The problem might be mitigated when video swap chain uses triple buffering. The video swap chain uses double buffering.

It seems better if we have a way to test the triple buffering.

Depends on: 1844253

Bug 1844253 is created for Comment 17.

Flags: needinfo?(sotaro.ikeda.g)

Hi 313432541@qq.com, can you check the STR of comment 0 with setting pref gfx.webrender.dcomp-video-force-triple-buffering = true from about:config? And can you get firefox profile with the pref?

Flags: needinfo?(313432541)
Attached file about.support.json —
Flags: needinfo?(313432541)

(In reply to 313432541 from comment #21)

https://share.firefox.dev/477oP3F

Hmm, triple buffering at video overlay swap chain seemed not alleviate the problem. GPU tasks seemed to too heavy. It may be necessary to reduce GPU utilization of either or both WebRender and hardware decoders.

At WebRender, one framebuffer with overlay(like Bug 1811437) seems to reduce GPU usage. But it is low priority now.

Change hardware decoder usage like chromium seems to take a long time. Fallback to software decoding could not be used, since it is 8K video.

Bug 1847665 could reduce RenderThread waits a bit.

Depends on: 1847665
Blocks: wr-perf

Same issue, made a reddit post about it before finding this bug. Summary of my investigation:

Details: CPU/integrated GPU: Intel Core i7 1165G7, Iris Xe graphics

  • Windows 10 Pro
  • Windows AV1 Video Extension is installed and up-to-date
  • Latest Intel graphics driver for this system (31.0.101.5186) is installed

Firefox versions tried: Firefox 64-bit 102.15.1 (ESR), 115.8.0 (ESR; also tried 32-bit), 122.0, and 123.0.1

  • all fresh installs (uninstalled previous version and deleted %AppData%/Mozilla folder between installs)
  • about:support#media shows AV1 hardware decoding is supported
  • setting media.hardware-video-decoding.force-enabled has no effect
  • disabling media.av1.use-dav1d has no effect

Test videos: Here is an AV1 video that can be downloaded directly (~650MB): https://insights.deovr.com/video/AV1/7779_2900p.mp4

  • Chrome and VLC 3.0.20 play the video smoothly with hardware decoding. Firefox and VLC 3.0.17 do not use hardware decoding and drop most of the frames. VLC codec information confirms this video uses AV1.

Here is a Youtube video: https://www.youtube.com/watch?v=zCLOJ9j1k2Y

  • 4K is served as VP9 to Firefox (for which it does use hardware decoding) but AV1 to Chrome; 8K is served as AV1 to both Firefox (100% CPU, most frames dropped) and Chrome (plays fine w/ hardware decoding)

DXVA Checker or Windows Task Manager -> Performance -> GPU -> Video Decode, Video Decode 1 graphs can be used to monitor status of hardware decoding.

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