Bug#589576: iceweasel: some animated gifs only show first frame - rest are blank

[Mike Hommey]

On Sun, Jul 18, 2010 at 11:02:59PM +0300, Heikki Aitakangas wrote:
> Package: iceweasel
> Version: 3.6.4-1
> Severity: normal
> 
> Iceweasel shows only the first frame of some animated GIFs. In cases where the
> problem occurs, the rest of the frames behave as though they were fully
> transparent over the whole picture area. The normal cycling behaviour does
> occur, so that the first frame is again shown after a duration that the rest of
> the frames would have taken to be shown.
> 
> The problem exists in both the testing version (3.5.10-1) and experimental
> version (3.6.4-1).
> It is not extension-related - I could reproduce the problem with a clean
> ~/.mozilla after moving my real ~/.mozilla away.
> Toggling KDE's compositing features did not affect the situation.
> 
> The problem is somehow related to Iceweasel itself as Konqueror renders the
> animated GIFs just fine on the same system.
> 
> 
> Based on the fact that only some GIFs show this bugginess, I would guess that
> this is related to Iceweasel's GIF decoder.
> 
> 
> A GIF that exhibits the problem:
> http://www.gifs.net/Animation11/Computers_and_Technology/Air_Conditioners/Ceiling_fan.gif
> 
> A GIF that does not exhibit the problem:
> http://www.gifs.net/Animation11/Computers_and_Technology/Air_Conditioners/Ventilator_2.gif

Works for me. Try downgrading libcairo2 to the version in unstable.

Mike