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

[Heikki Aitakangas]

On 07/19/2010 11:09 AM, Mike Hommey wrote:
> 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
>    

That worked. So the bug is in libcairo2 version 1.9.12-1, but not in 
1.8.10-4.