Bug 756569

Summary:	some WebM videos in YouTube are jerky
Product:	[Fedora] Fedora	Reporter:	Aram Agajanian <agajania>
Component:	xorg-x11-drv-ati	Assignee:	Jan Horak <jhorak>
Status:	CLOSED UPSTREAM	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	17	CC:	gecko-bugs-nobody, jhorak, xgl-maint
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Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	Bug Fix
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Clone Of:		Environment:
Last Closed:	2012-03-29 14:17:14 UTC	Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Aram Agajanian 2011-11-23 23:28:38 UTC

Description of problem:
Some WebM videos in YouTube are jerky.  The following video is an example:

http://www.youtube.com/watch?v=7rljVIVHT6o

If I download the video with youtube-dl and play it with totem, it is not jerky.

I have also seen some other WebM videos in YouTube which are not jerky.

Version-Release number of selected component (if applicable):
firefox-8.0-3.fc16.x86_64

How reproducible:
Happens every time.

Steps to Reproduce:
1.  Start Firefox.
2.  Go to http://www.youtube.com/watch?v=7rljVIVHT6o 
3.  Play video.
  
Actual results:
The video is jerky.

Expected results:
The video should be smooth.

Additional info:
The audio is OK.

Comment 1 Aram Agajanian 2011-11-24 00:06:28 UTC

I forgot to mention that you have to join YouTube's HTML5 trial to test this.  This can be done by clicking the link at http://youtube.com/html5

Comment 2 Aram Agajanian 2011-11-28 19:32:26 UTC

I tested two other computers last weekend.  One is running F15/Gnome3/IntelGPU and the other is running F16/XFCE/RadeonX1650.  In both cases, the frame rate was better than on my office computer.

My office computer is running F16/Gnome3/RadeonHD2400XT.

All of these computers have Firefox 8.0.

Comment 3 Aram Agajanian 2011-11-28 19:41:13 UTC

If I play the webm video that I downloaded with youtube-dl in Firefox with a URL like the following:

file:///var/tmp/7rljVIVHT6o.webm

then the performance is much better.  So the problem seems to have to do with YouTube's HTML5 player.

Comment 4 Jan Horak 2012-03-29 14:17:14 UTC

I can reproduce it too. I escalated it to upstream: https://bugzilla.mozilla.org/show_bug.cgi?id=740342

Comment 5 Aram Agajanian 2012-12-17 23:43:38 UTC

This bug seems similar to https://bugs.freedesktop.org/show_bug.cgi?id=47776.