68104 - Animated GIF speed is just insane!!!

Status: VERIFIED INVALID

(Core :: Graphics: ImageLib, defect)

Description

[Mark Slater]

Build 2001020720, win32-installer.exe

The speed of th animated GIF in that URL is just insane! Viewed in IE, the GIF
rotates at a more civilised speed. Is this even a bug, or just an attempt to
make Mozilla appear faster than IE? ;-)

Comment 1

[Fabian Guisset]

-> imagelib

Comment 2

[Doron Rosenberg (IBM)]

confirming, file in question is http://plaque.free.fr/world.gif

ns4 does it the same as moz.

Comment 3

[Warner Young]

I also see another problem with it, at least in Windows.  Win98, build
2001020716, the GIF animates even faster if I move the mouse anywhere within the
browser window.  Not moving the mouse, it rotates somewhat faster than it
should.  Moving the mouse, it goes very, very fast.  Also, checking it with
Adobe ImageReady, it shows that the GIF is set to 0.01 sec per frame, so
actually, it *seems* be to rotating at the correct speed (when the mouse doesn't
move).

Comment 4

[Mark Slater]

Whooopsie... mea culpa. But this begs the question, what does IE know that 
neither Moz, ImageReady or Netscape 4.x know? Perhaps this is an IE-only 
problem in that IE won't show the correct for speeds set that fast? Somehow, I 
don't think the page's owner wanted to have the world whizz round like that...

Comment 5

[Warner Young]

MS Knowledge base article Q226697 might be the answer.  A multi-imaged GIF file
with no delay set between frames plays at the "default" speed.  This speed is
100 milliseconds per frame for IE, but 10 milliseconds per frame for Office
2000.  Gotta love MS for their consistency!  Anyway, sounds like there's no hard
and fast rule.

Comment 6

[Doron Rosenberg (IBM)]

so wait, you are saying we are doing it correctly? the mousing causing it to be
faster is a known bug.

Comment 7

[Mark Slater]

Yes :-)

If the speed of the animated GIF is set to 0.01 secs between frames, then so be it. 

Comment 8

[Warner Young]

And to confirm, I decoded the GIF to look at the frame delays, and they're
definitely set to 0.01 sec.

Comment 9

[Jason Eager]

So this should be marked as invalid?

Comment 10

[Terri Preston]

I think so, therefore I'm marking it invalid

Comment 11

[Keyser Sose]

*** Bug 70813 has been marked as a duplicate of this bug. ***

Comment 12

[Boris Zbarsky [:bzbarsky]]

*** Bug 71809 has been marked as a duplicate of this bug. ***

Comment 13

[Boris Zbarsky [:bzbarsky]]

*** Bug 72962 has been marked as a duplicate of this bug. ***

Comment 14

[Terri Preston]

Now I'm verifying invalid