1445501 - High CPU usage with VP9 codec on YouTube (Intel iGPU)

Status: RESOLVED WORKSFORME

(Core :: Audio/Video: Playback, defect, P3)

Description

[u577973]

Attachment: about_support.txt

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:59.0) Gecko/20100101 Firefox/59.0
Build ID: 20180310025718

Steps to reproduce:

I have an Intel HD Graphics 530. For more informations, see the attached file that displays my about:support.

1. Load a youtube video (with the following resolutions : 720p60 and/or 1080p60)
2. Check with "Advanced Statistics" that the video uses the VP9 codec
3. Monitor the CPU and temperature


Actual results:

The CPU percentage is around 60% constant and the temperature increases significantly (in fullscreen paticurlarly).


Expected results:

With h.264 codec, the CPU is around 30% or less with the same configuration than the STR.

Comment 1

[Jens Hausdorf :jens1o [ni? me]]

Yeah, I can reproduce it(on Nightly):

Build ID: 20180316100132
Platform/OS: Windows_NT 10.0 x64

URL to test on: https://www.youtube.com/watch?v=wK4QxezQyvw

Although it decreases when it has buffered anything, it's still taking up to 50% on a rather bad laptop and many frames are being dropped.

Comment 2

[Julien L.]

I can also reproduce it on Firefox 59.0.2 x64.
Jens, do you know someone in the Mozilla staff that may works on this bug?
Just to get this thing moving :)
Thanks.

Comment 3

[Jens Hausdorf :jens1o [ni? me]]

Nope, I'm just a volunteer. :/

Comment 4

[Maire Reavy [:mreavy]]

H.264 is typically hardware-accelerated, and even in pure software implementations is lower-overhead than VP9.  (VP8 is roughly similar to H.264, though rarely HW accelerated).  Likely this is as-expected, though I don't know if HW acceleration for vp9 should be expected on the reporter's GPU/CPU.

Comment 5

[Jean-Yves Avenard [:jya]]

(In reply to Jens Hausdorf from comment #1)
> Yeah, I can reproduce it(on Nightly):
> 
> Build ID: 20180316100132
> Platform/OS: Windows_NT 10.0 x64
> 
> URL to test on: https://www.youtube.com/watch?v=wK4QxezQyvw
> 
> Although it decreases when it has buffered anything, it's still taking up to
> 50% on a rather bad laptop and many frames are being dropped.

Please provide a copy of your about:support

Did you force the preference media.mediasource.webm.enabled to true?

The default is off, on slow machine, vp9 is disabled by default, and the threshold set to enable vp9 is pretty high.
If you leave settings on default, you shouldn't be getting dropped frames.

An Intel 530 can't do hardware decoding of vp9

Comment 6

[Jean-Yves Avenard [:jya]]

The machine score 157 in the vp9 benchmark, the threshold is 150 to enable vp9... Maybe we should bump that value.
Vp9 will always be more cpu intensive than h264.
With h264 however, youtube limits the content to 1080p max

Comment 7

[Jens Hausdorf :jens1o [ni? me]]

Sorry Jean-Yves, I missed that email apparently.

Application Basics
------------------

Name: Firefox
Version: 62.0a1
Build ID: 20180522220730
Update Channel: nightly
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0
OS: Windows_NT 10.0
Multiprocess Windows: 1/1 (Enabled by default)
Web Content Processes: 5/4
Enterprise Policies: Inactive
Google Key: Found
Mozilla Location Service Key: Found
Safe Mode: false

Crash Reports for the Last 3 Days
---------------------------------

Report ID: bp-0f642f44-86d8-4508-8643-723820180521
Submitted: 2 days ago

All Crash Reports     Nightly Features
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Version: 2018.05.17.1352-edc5578e
ID: [e-mail]

Name: Application Update Service Helper
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Name: Photon onboarding
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Name: Pocket
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Name: Web Compat
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ID: [e-mail]

Name: WebCompat Reporter
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ID: [e-mail]

Extensions
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Enabled: true
ID: {13d75c08-fed6-4ff6-a356-d79509b17e44}

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Security Software
-----------------

Type:

Type:

Type: Windows Firewall

Graphics
--------

Features
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Asynchronous Pan/Zoom: wheel input enabled; scrollbar drag enabled; keyboard enabled; autoscroll enabled
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Decision Log
WEBRENDER:
opt-in by default: WebRender is an opt-in feature

Workarounds
NO_CONSTANT_BUFFER_OFFSETTING: Constant buffer offset binding does not work


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____________________________

No, I did not forced to enable webm support. It was true. Purposely, I set it to false and it's a lot better. :)

Comment 8

[Jean-Yves Avenard [:jya]]

Jens, I don't believe your problem is related to this bug. There's no reason why you should ever get VP9 with your machine (VP9 isn't enabled because its benchmarked speed is way too low: 23fps on 720p when we want a minimum of 150p).

Comment 9

[Jens Hausdorf :jens1o [ni? me]]

Alright. Somehow it works better, am I supposed to file a new bug?

Comment 10

[Jean-Yves Avenard [:jya]]

You have disabled webm support entirely (you've set media.webm.enabled to false), which means with YT you'll only ever get mp4 with h264 which is hardware accelerated.

If you experience a new problem, then yes please.. open a new bug

Comment 11

[Jean-Yves Avenard [:jya]]

You mentioned that the CPU usage was greater with VP9 than with H264, that is to be expected. However, you didn't mention playback quality.

Is playback smooth in YouTube for you? if so, no need to change anything.

Comment 12

[u577973]

(In reply to Jean-Yves Avenard [:jya] from comment #11)
> You mentioned that the CPU usage was greater with VP9 than with H264, that
> is to be expected. However, you didn't mention playback quality.
> 
> Is playback smooth in YouTube for you? if so, no need to change anything.

The playback of most videos are smooth. But, some videos have dropped frames sometimes.

Comment 13

[Jean-Yves Avenard [:jya]]

thank you.

did you compare with the CPU usage in Chrome for those same streams?

Comment 14

[u577973]

(In reply to Jean-Yves Avenard [:jya] from comment #13)
> thank you.
> 
> did you compare with the CPU usage in Chrome for those same streams?

With the same stream, I have ~48% of CPU load for Firefox 60 and ~51% for Chromium 68 with the same codec. I think it is fixed.

Comment 15

[Jean-Yves Avenard [:jya]]

Great to hear... this one also what I expected your answer to be, but wanted to be sure.

Comment 16

[Julien L.]

Hi,
like I already said, I'm having cpu usage and I can hear the fans of my laptop turning faster when watching at 1080p60 videos on youtube with VP9 codec.
The problem is that a few weeks/months ago, there was no problem with these videos and VP9, the cpu usage was way down.
Why now I can see and hear high cpu usage? (a screenshot : http://ratm6.free.fr/captures_d'ecran/cpu_usage_with_vp9_youtube_1080p60.JPG)
I think there is a firefox bug or youtube bug.
Thanks.

Comment 17

[Julien L.]

Oops I forgot to say that I have an Intel HD graphics 4600 gpu.

Comment 18

[Jean-Yves Avenard [:jya]]

20% CPU usage to do vp9 @ 60fps on a processor not support VP9 hardware decoding is very good. 
You can't expect lower with a video that requires software decoding.

you can disable vp9 and use h264 if you want even lower cpu usage, but the video quality and network usage won't be as good.