1466399 - YouTube videos stutter during game launched in background

Status: RESOLVED DUPLICATE of bug 1453880

(Core :: Graphics: Layers, defect, P3)

Description

[Bastekxyz]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0
Build ID: 20180516032328

Steps to reproduce:

To reproduce this bug you must launch any video game (for example Overwatch, World of Warcraf)


Actual results:

Every video from youtube (windowed or fullscreen) stutters: https://youtu.be/6AtPKmrrB5o


Expected results:

Video should be fluent, withount any shutter. This bug was NOT present in any Firefox version before Quantum.

Comment 1

[Daniel Bodea [:danibodea]]

Hello Bastekxyz, 

Could you try to disable the hardware acceleration preference and then try to reproduce the issue again?

To do this, go to options, scroll down to the "Performance" section, un-tick the "Use recommended performance settings" option, then un-tick the "Use hardware acceleration when available" and retry reproducing issue.

Thank you!

Comment 2

[Bastekxyz]

(In reply to Bodea Daniel from comment #1)
> Hello Bastekxyz, 
> 
> Could you try to disable the hardware acceleration preference and then try
> to reproduce the issue again?
> 
> To do this, go to options, scroll down to the "Performance" section, un-tick
> the "Use recommended performance settings" option, then un-tick the "Use
> hardware acceleration when available" and retry reproducing issue.
> 
> Thank you!

Hello,

I did what you have asked for and i can't reproduce this issue.

Regards.

Comment 3

[Ryan Hunt [:rhunt]]

Could you go to about:support in your browser and copy and paste the information here?

If this is a new issue since Quantum, could you try and use our mozregression tool to see what change caused this stuttering to happen? You can find instructions here [1].

[1] https://mozilla.github.io/mozregression/quickstart.html

Comment 4

[Bastekxyz]

About:support - https://gist.github.com/Bastek/d760eed218c29f75aeb7121f5f412eb5

There is a error after  couple of build tested: https://i.imgur.com/uF5H4J6.png

Comment 5

[TalasNetrag]

I have the same issue and there is also another bug-report that appears to be dealing with the same issue https://bugzilla.mozilla.org/show_bug.cgi?id=1453880

I have a GTX 1060 (6GB), Ryzen 1600X, 16GB RAM and Windows 10 Home 64bit (1803). Display drivers and chipset drivers are up to date.

Steps to reproduce:

1. Install Firefox 66.0.3 64bit and create a new profile.
2. Start FurMark to stress the GPU (this is more reliable than starting a game to reproduce this issue).
3. Start a YouTube Video or Twitch-stream with 60fps (on 30fps this issue is barely noticeble but its still there).
   Testvideo: https://www.youtube.com/watch?v=lG5LZNhfyGM

This is how it looks like: http://www.mediafire.com/file/zblkwjeqf59jo72/2019-05-03+19-39-28.mkv
It almost looks like its junping 1-2 frames back.

Other Browsers tested: Chrome, Edge, Vivaldi are all working properly.

Other steps I tried to resolve the issue:

• Disabling HWAcceleration: The stuttering isnt as pronounced but still there.
• The h264ify AddOn: No change.
• Disabling WebGL: No change.
• Reinstalling Firefox with a new profile: No change.

Comment 6

[Daniel Bodea [:danibodea]]

I think this issue should be confirmed considering that it was reproduced on 2 systems.