419187 - Flash video doesn't always repaint (on e.g. YouTube)

Status: RESOLVED FIXED

(Core Graveyard :: Plug-ins, defect)

Description

[jag (Peter Annema)]

Regression from bug 395983 on SeaMonkey Mac and Camino (Mac OS X 10.4). For some reason Firefox doesn't seem to be affected.

When viewing flash video in SeaMonkey and Camino, when you scroll the page the video will disappear. Sometimes scrolling it out of view and slowly back into view may bring it back. Easily reproduced on any YouTube page.

Comment 1

[jag (Peter Annema)]

Oh, I guess I should mention I'm using Shockwave Flash 9.0 r115 :-)

Comment 2

[Matthew Gregan [:kinetik]]

Unfortunately I can't reproduce this with today's SeaMonkey or Camino nightlies on my 10.5 machine.

Comment 3

[philippe (part-time)]

Noticed something very similar on http://elpais.com, and reproduced on YouTube.

STR
1. start the flash video (or unblock if you have flashblock)
2. let the video play a few seconds
3. Hide the browser (command H)
4. Bring the browser to the front

Actual Result: the flash movie vanished.
scroll the page a little, and the the flash video reappears

With an hour old Camino build, 10.5.2, Intel

Comment 4

[Matthew Gregan [:kinetik]]

Thanks, I can reproduce that with Camino on my machine but it only happens once every ~10 attempts.  I can't reproduce it with Firefox.

Comment 5

[Jay Moran (jaym/lazvon)]

Happening for Firefox for me. This started on checkouts from a couple days ago. I don't use Camino or Seamonkey though, just Firefox. I'll try a nightly right now to see if the problem exists with them.

Comment 6

[Jay Moran (jaym/lazvon)]

Okay. Interestingly, I didn't even have to try the nightly build. I simply used a fresh profile, and the problem goes away. Use my current profile and the problem comes back. Something in there is not playing nicely. I'll export my bookmarks and copy my home pages and use a fresh profile.

Comment 7

[Jay Moran (jaym/lazvon)]

Doh! Firebug was my problem. Disabled it and now YouTube is no longer flickering while I scroll... still using original profile. My apologies on intruding... but perhaps it gives a hint on other places to look for the others.

Comment 8

[jag (Peter Annema)]

I did try a clean profile and I still saw the problem, so whatever it is can be seen in a clean SeaMonkey profile. I don't have firebug running, but I wonder if the JS debugger is on by default for SeaMonkey.

Comment 9

[Matthew Gregan [:kinetik]]

During the periods where the plugin is not painting, are you seeing (non-fatal) errors like the following logged to the console?

<Error>: CGContextSaveGState: invalid context
<Error>: CGContextScaleCTM: invalid context
<Error>: CGContextDrawImage: invalid context
<Error>: CGContextRestoreGState: invalid context

Comment 10

[philippe (part-time)]

(In reply to comment #9)

Indeed. (with Camino)

I've seen one more flagged, earlier in my log, not sure it is related to Flash or to images:
<Error>: CGBitmapContextCreateImage: invalid context

Comment 11

[Matthew Gregan [:kinetik]]

Okay, that's good news.  I'm fairly certain that this bug will be resolved by my patch for bug #408898, so I've made this one depend on that.  The one case where I can reproduce this (using Camino trunk, playing video at YouTube and repeatedly hiding/showing the window) is definitely fixed by my patch.

Comment 12

[jag (Peter Annema)]

Yeah, the patch in bug 408898 fixes this.

Comment 13

[Matthew Gregan [:kinetik]]

Fixed by the patch in bug 408898.