Closed Bug 142349 Opened 22 years ago Closed 22 years ago

Uneven Frame Rate for Animated GIFs

Categories

(Core :: Graphics: ImageLib, defect)

Product:
Core
Component:
Graphics: ImageLib
Platform:
x86
Windows 2000
Type:
defect
Priority:
Not set
Severity:
normal

Tracking

()

Status:
RESOLVED WORKSFORME

People

(Reporter: bugzilla, Assigned: pavlov)

References

(
URL
)

Details

(Keywords: perf) 

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0rc1)
Gecko/20020417
BuildID:    2002041711

Animated GIFs are displayed with an uneven frame rate.  As in the example
http://br.eff.org/br.gif , the blue ribbon should spin at a constant speed, but
alternates between fast an slow.

Reproducible: Always
Steps to Reproduce:
1.View URL in browser.  No special steps
2.
3.

Actual Results:  GIF displayed incorrectly.

Expected Results:  Animated GIF should display at correct rate.
To imagelib.... this may be a dup of the various windows timer issues we've had
lately....
Assignee: Matti → pavlov
Component: Browser-General → ImageLib
QA Contact: imajes-qa → tpreston
wfm using build 2002050404 on Win2k (trunk): constant frame rate (as with NS4.76
and IE6).
WFM with build 2002050409 Linux (1.0RC2 branch).
WFM with build 2002050406 WinME (1.0RC2 branch).

Reporter, can you reproduce this with a recent nightly build?
Yes, I can reproduce it with the latest nightly build (downloaded and ran the 
installer (ftp://ftp.mozilla.org/pub/mozilla/nightly/latest/mozilla-win32-
installer.exe).

Note: This seems to have introduced other, unrelated problems.  Later today, I 
will completely uninstall, then reinstall the latest build and see if they 
continue.
I am reproducing this bug with Build ID: 2002050504.  There seems to be the 
added problem of a long delay where the animation does not "animate".
This bug continues with RC2 (2002051006).
I still can't see this with RC2 on WinME.

Reporter, could you try to find out what causes the problem? Have you tried on a
clean profile? Have you tried on another computer?

If nobody can reproduce the bug, nobody can fix it.
I am able to reproduce the problem with an uninstall/reinstall of RC2.  I have
not tried on a different machine, but this machine is as follows:

IBM Aptiva, Model#: 2170245
SiS 530 on-board video/8MB RAM
AMD K6-2 450MHz
256MB RAM

Windows 2000/SP2

The previous Mozilla version on this machine, 0.98 did not exhibit this problem.
 I'll still try and see if it is a hardware issue.
Keywords: perf
Blocks: 119597
WFM 2002070204 win2k trunk
WFM with 2002092408/trunk/win2k.

reporter: can you reproduce this bug with a recent build of mozilla (for
example, 1.2alpha)? if so, please comment again with details. if not, please
resolve this bug as WORKSFORME. thanks.


no response, resolving WFM.

reporter: if you can reproduce this problem with a recent build of mozilla,
please reopen this bug. thanks.
Status: UNCONFIRMED → RESOLVED
Closed: 22 years ago
Resolution: --- → WORKSFORME
Testing confirms that this is a driver/sw issue.  The platform is an IBM Aptiva 
with on-board SiS 530 video.  The problem occurs under Win2k, but is not 
repeatable when running under win98 on the same machine.

The condition is not limited to Mozilla or animated GIFs, but also applies to 
Realmedia, and, to a certain extent, Windoze media formats.
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