571482 - [OOPP] Repaint errors when scrolling YouTube video pages with scroll wheel

Status: RESOLVED INCOMPLETE

(Core Graveyard :: Plug-ins, defect)

Description

[Gábor Stefanik]

Attachment: Screenshot of misrendered YouTube Player

On some (not all) YouTube video pages, quickly scrolling up and down with mouse wheel while the video is playing causes the video player to redraw incorrectly. This is especially visible on the player controls. Ghosts of the video image, other video controls, or page contents below the player may appear in place of the proper controls. Other methods of scrolling don't seem to cause misrendering.

For me, the bug is easier to reproduce with smooth scrolling enabled, but I have also seen it sometimes with smooth scrolling off.

Build is 3.6.4-build6 (Mozilla/5.0 (Windows; U; Windows NT 6.1; hu; rv:1.9.2.4) Gecko/20100527 Firefox/3.6.4), Hungarian version.

Comment 1

[(mostly gone) XtC4UaLL [:xtc4uall]]

this is WFM using above mentioned build, WinXP & Flash 10.1.53.64.
what Flash version have you tested against?

Comment 2

[Karel Jára]

I have the same problem and not only on YouTube. Generally the video controls of flash video players are misrendered after scrolling a while by the mouse wheel. I have the latest version of Flash 10.1.82.76 and also tried in the latest nightly build of Firefox 4.0. This problem appears there as well. I’ve added an image of two different misrendered controls. One is from YouTube and one from Archive.org.

Comment 3

[Karel Jára]

Attachment: Video controls misrendered

Comment 4

[Benjamin Xiao]

I am not sure this is a OOPP problem per se. I am experiencing this problem only when D2D and/or D3D is turned on. When I have them both disabled, flash videos repaint properly. This sounds like a layers issue.

Comment 5

[Ed Morley [:emorley]]

This issue (or one that appears very similar) occurs for me.

However hardware acceleration is turned off in prefs.
Also, the problem only occurs when dom.ipc.plugins.enabled = true - so presumably this is due to the OOPP code.

STR:
1) Start Minefield latest build using a blank profile.
2) Turn off hardware acceleration in prefs and disable any other plugins apart from flash. Restart for changes to apply.
3) Visit a youtube page such as: http://www.youtube.com/watch?v=m8eB83axVvw or another example page: http://www.woothemes.com/2010/11/building-content/ ( the latter uses Screenr embedded flash video)
4) Press play on video and use mouse wheel to scroll up and down fairly rapidly. ie: 3-4 clicks of wheel up and then the same number back down in less than half a second. Try not to let the video controls go off-screen whilst doing this, otherwise they get repainted even if the bug had occurred.

Expected:
- Even when scrolling, flash plugin should still repaint properly.

Actual:
- IFF dom.ipc.plugins.enabled = true ; in approx 10-30% of occasions when performing step #4, the video controls are overpainted by black boxes or else video content. Alternatively, the video controls are rendered over the video content and the video content is repeated several times within the video frame. See attached screenshots.
- Occurs when hardware acceleration unticked in prefs. (ie: layers.accelerate-none = true) as well as in safe mode, so presumably not related to the new layers/graphics code.
- Does not occur if dom.ipc.plugins.enabled = false.

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b8pre) Gecko/20101115 Firefox/4.0b8pre

Flash 10.1.102.64

#Graphics info from about:support
Adapter Description: NVIDIA GeForce 6200 TurboCache(TM)
Vendor ID: 10de
Device ID: 0161
Adapter RAM: 64
Adapter Drivers: nvd3dumx,nvd3dum
Driver Version: 8.17.12.5896
Driver Date: 7-9-2010
Direct2D Enabled: false
DirectWrite Enabled: false
GPU Accelerated Windows: 0/1

Comment 6

[Ed Morley [:emorley]]

Attachment: Example where video controls rendered in middle of video frame

Comment 7

[Ed Morley [:emorley]]

Attachment: Example where black boxes/bars over video controls

Also, just to clarify step#4 in my STR above:

By "Try not to let the video controls go off-screen whilst
doing this, otherwise they get repainted even if the bug had occurred."
...I mean: That the top half of the video can go off-screen, just not the very bottom where the controls are.

Comment 8

[Benjamin Xiao]

I can't reproduce this in the latest nightly in XP with GPU off and OOPP on. I'll test later using Windows 7, although I have not seen any of my youtube videos malfunction like this.

Comment 9

[Benjamin Smedberg]

Resolving old bugs which are likely not relevant any more, since NPAPI plugins are deprecated.