1508017 - Unable to watch youtube 8K 60fps videos properly

Status: UNCONFIRMED

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

Description

[Mike]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0

Steps to reproduce:

I'm unable to watch ANY 8K 60fps videos on Intel UHD 630

Problem:
Video starts, you can see picture for a sec then it stops, you can hear audio all the time, after 10 seconds you can see a new scene change and video stops again.

Example Video: https://www.youtube.com/watch?v=hVvEISFw9w0

Note: ANY video up to 8K 30fps plays with no problem.

Fresh Windows 10 installation RS5 1809 17763.107

Firefox: tested in browsers up to 65.0 nightly, no change.
I also tried ALL older drivers, still no change.

GPU: Intel UHD 630
Intel driver Version: 25.20.100.6373 (Latest)

Opera browser = 8K 60fps no problems
Chrome, no problem
Edge, no problems

UHD 630 is capable to play 8K 60fps with no hassle: https://youtu.be/coplw7_bGBI?t=115

Comment 1

[Andreas Pehrson [:pehrsons]]

jya, could you take a look at this?

Comment 2

[Jean-Yves Avenard [:jya]]

The UHD isn't capable to do 8K to start with, it's 4K max the size of a supported hardware frame. so it's all software.

It also only supports DisplayPort version 1.2 or HDMI 1.4 (4096×2160 max), and as such can't drive an 8K screen. So what's the point of playing a 8K video on what will be at the most a 4K screen?

For performance, the issue will be more than likely in the compositing side of things.

Not enough information provided to act on it.

For a start, provide the about:support output, and ideally a performance profile when playing a video.

Comment 3

[Mike]

(In reply to Jean-Yves Avenard [:jya] from comment #2)
> The UHD isn't capable to do 8K to start with, it's 4K max the size of a
> supported hardware frame. so it's all software.
> 
> It also only supports DisplayPort version 1.2 or HDMI 1.4 (4096×2160 max),
> and as such can't drive an 8K screen. So what's the point of playing a 8K
> video on what will be at the most a 4K screen?
> 
> For performance, the issue will be more than likely in the compositing side
> of things.
> 
> Not enough information provided to act on it.
> 
> For a start, provide the about:support output, and ideally a performance
> profile when playing a video.

about:support

https://pastebin.com/raw/xe5CKbTu
google translated: https://pastebin.com/raw/Gp1SKFhx

Yes, it's a foreign language.

----

8K HW support, HEVC and VP9 Profiles: https://i.imgur.com/DTha7CP.png

Skrin 1: Edge browser - Perfect smooth Video 8K 60fps HW Decode: https://i.imgur.com/puIkYst.jpg

As you can see, there is no way this could work without HW decode acceleration.
In fact you can see a perfect 90% Video Engine load.
CPU is barely 20% usage and CPU clock clearly saying I don't care, ;)

Skrin 2: https://i.imgur.com/LKLbsLm.jpg
"Just for fun", the same link with 8K 60fps, potplayer
Again, very smooth playback.

Like I said before, there is absolutely no problem wathing ANY wideos under:
Opera, Chrome, Edge

Now regarding: "what's the point of playing a 8K video on what will be at the most a 4K screen?"

The same point as watching 4K on 1080p display.
Much higher bitrate brings much better video quality, even a downscaled one, and you can't deny that.

But Jean, I don't want to bring the discussion to such level.
I've found a bug so I reported with a hope that someone will help me.

Regards.

Comment 4

[Alex Chronopoulos [:achronop]]

NI to jya to continue that conversation.

Comment 5

[Cristian Fogel [:cfogel]]

I can confirm that there is somewhat of an issue with the playback.
In my case it would be expected since the graphics card is a bit old (AMD 760G) tested on Win7x32;

• Here's a pastebin linkto my about:support info;
• Chrome does in fact, playback a bit better the videos on 8k;
• Video tested on.
• Perf link for the video trying to be played for ~20seconds;
• another mention would be that it's still a case for Win10, Ubuntu18, the issue being that the video hangs but the audio still plays when not buffering.

Comment 6

[Catalin Sasca, Desktop QA [:csasca]]

This is reproducing too on mac10.11 with Intel Iris Pro graphics on Firefox 66.0b6. Anything higher than 4k, results in black screen, and only audio.

Comment 7

[Jean-Yves Avenard [:jya]]

Playback is really bad here.
Testing on a machine with no HW decoder, we will go from keyframe to keyframe.

Chrome will drop about 50% of the frames but it still looks okay.

On a machine with HW VP9 decoding (intel 630UHD), decoding is fast enough and we don't drop any frames there, however none are painted on screen, we're close to 100% dropped frame rate. This is not because decoding is too slow.

Matt, you could you have a look?

Comment 8

[Matt Woodrow (:mattwoodrow)]

I don't have any machines with HW 8k decoding support unfortunately.

Can you grab a profile?

Comment 9

[Asif Youssuff]

Older bug, but Matt asked for a profile -- Jean-Yves, is this something you can do?

Comment 10

[Jean-Yves Avenard [:jya]]

Matt, could you provide instructions on what profile info you're after?

Comment 11

[Matt Woodrow (:mattwoodrow)]

As mentioned out of band, I just want a gecko profile (with all threads that handle video frames) to try to spot where the bottleneck is.

Comment 12

[Paul Adenot (:padenot)]

NI jya so this doesn't get forgotten.

Comment 13

[Jean-Yves Avenard [:jya]]

Testing on a Lenovo Thinkpad X1 Extreme; plays nicely with the nvidia 1050Ti, barely a slide show when using the intel UHD 630, even though the DXVA Checker shows the GPU decoder at 48% speed (1050Ti is at 97% usage there). In Chrome GPU 3D usage is around 19% vs FF at 35%

Comment 14

[Jean-Yves Avenard [:jya]]

profiler capture: https://perfht.ml/39UcAtH

Comment 15

[gracz542]

Same issue on a Radeon RX 470 (w/ Ryzen 2600 & 16GB RAM). Decodes the first several frames and then the video hangs. Audio still works. 8K at 30fps works perfectly fine.

Here's a profiler capture: https://perfht.ml/2ynoJcD

Comment 16

[Paul Adenot (:padenot)]

Yeah, we see it's still the compositor struggling. This really is a problem, the two machines being profiled are really really fast compared to what people have.