1132433 - YouTube settings menu is misplaced after playing several high definition videos from the recommended videos section

Status: RESOLVED INCOMPLETE

(Core Graveyard :: Plug-ins, defect)

Description

[Andrei Vaida [:avaida]]

Attachment: Screenshot from Windows 7 (64 bit)

Reproducible on:
- Nightly 38.0a1 (2015-02-11)
- Aurora 37.0a2 (2015-02-11)
- Beta 36.0b8 (20150209164123)
- Release 35.0.1 (20150122214805)

Affected platforms: 
Windows 8, Windows 7, Windows Vista, Windows XP

Steps to reproduce:
0. Make sure you have the latest Flash Player plug-in installed - http://get.adobe.com/flashplayer/.
1. Launch Firefox with a clean profile.
2. Navigate to https://www.youtube.com/.
3. Play a high definition video at 1080p - e.g. https://www.youtube.com/watch?v=0vrdgDdPApQ.
4. From the recommended videos section, play another video and click the settings button from the video controls bar.
5. Repeat the previous step a few times.

Expected result:
Each video is played back properly, with no glitches, stuttering or visual artifacts. 

Actual result:
After playing several videos and clicking for each of them the settings button, the settings menu is misplaced, with the video quality options expanded and the play speed and any other options that should be available, missing.

Regression range (m-c):
- Last good revision: be65d1fde126
- First bad revision: 3436787a82d0
- Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=be65d1fde126&tochange=3436787a82d0

Notes:
- Unfortunately, I was unable to bisect further on m-i and the regression range obtained on m-c is not reliable, as this issue requires several tries to replicate and it varies from one version to another.
- I was unable to reproduce the bug on Mac and Linux.

Comment 1

[Lawrence Mandel [:lmandel] (use needinfo)]

Does this only occur on YouTube (where we're replacing Flash with MSE) or does it also occur when YouTube videos are embedded on other sites?

Comment 2

[Andrei Vaida [:avaida]]

(In reply to Lawrence Mandel [:lmandel] (use needinfo) from comment #1)
> Does this only occur on YouTube (where we're replacing Flash with MSE) or
> does it also occur when YouTube videos are embedded on other sites?

I believe this is isolated to YouTube. I was unable to replicate the bug on a barebones .html file with an embedded YouTube Playlist.

Comment 3

[Lawrence Mandel [:lmandel] (use needinfo)]

Given that the impact is limited to youtube.com with Flash on Windows and we're planning to ship MSE for Vista+ in 37, this looks like a wontfix to me.

Anthony - Do you agree?

Comment 4

[Anthony Jones (:ajones, :kentuckyfriedtakahe, :k17e)]

Fixing it would be more in Benjamin's court, although it does look kind-of graphicsy.

Comment 5

[Benjamin Smedberg]

My first instinct is that this is a youtube bug. It's odd that you were able to identify a regression range, though. There is nothing in the regression range which is suspect. Are you sure you can't reproduce this on earlier builds? The regression range is from February, but you also say you can reproduce on 35.0.1 which was built in January and was from a much earlier nightly range.

Comment 6

[Andrei Vaida [:avaida]]

(In reply to Benjamin Smedberg  [:bsmedberg] from comment #5)
> My first instinct is that this is a youtube bug. It's odd that you were able
> to identify a regression range, though. There is nothing in the regression
> range which is suspect. Are you sure you can't reproduce this on earlier
> builds? The regression range is from February, but you also say you can
> reproduce on 35.0.1 which was built in January and was from a much earlier
> nightly range.

The regression range I provided is not reliable, as I already mentioned in my report (Comment 0). I was unable to provide a better one because the issue takes longer to reproduce on older builds, so it's a bit tricky. The bug is certainly reproducible on 35.0.1.

I'll take another look at this, perhaps I'll have better luck reproducing it.

Comment 7

[Anthony Jones (:ajones, :kentuckyfriedtakahe, :k17e)]

Flash or YouTube issue

Comment 8

[u597032]

This website no longer uses flash.