[gwenview] [Bug 305072] Animated GIF is some milliseconds too slow

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=305072

camille@encelade.space changed:

   What|Removed |Added

 CC||camille@encelade.space

--- Comment #11 from camille@encelade.space ---
As of Gwenview 19.12.3, this bug is still present.
While launching the 60 second clock gif image in a correctly behaving player
(here Firefox 90.0.2, or Nomacs 3.12) and Gwenview at the same time, the result
is that it's not just some milliseconds behind, but twice as slow.

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[gwenview] [Bug 305072] Animated GIF is some milliseconds too slow

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=305072

--- Comment #10 from karolbienkow...@protonmail.com ---
I'm on Manjaro with Gwenview 20.04.3. This one gets more interesting.

If I launch a gif from, lets say, Dolphin then it is slow.
But other then that, every time I load a gif for the first time, it runs fine.
For example, when I go to the next gif (arror keys or the 'next' button) or
launch a gif from Gwenview explorer view.
This works only once, because if I go back to the same gif (even with arrows,
or explorer view) it's slow now.

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[gwenview] [Bug 305072] Animated GIF is some milliseconds too slow

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=305072

karolbienkow...@protonmail.com changed:

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   ||com

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[gwenview] [Bug 305072] Animated GIF is some milliseconds too slow

[ariasuni]

https://bugs.kde.org/show_bug.cgi?id=305072

ariasuni  changed:

   What|Removed |Added

 CC||pe...@hack-libre.org
Version|2.9.0   |20.04.0

--- Comment #9 from ariasuni  ---
If I open gwenview, then open several gifs successively, I don’t observe any
memory leak (at least not anything easily noticeable). However, any gif is
played really slowly (Gwenview 20.04.0, Arch Linux).

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[gwenview] [Bug 305072] Animated GIF is some milliseconds too slow

[Toby Fox]

https://bugs.kde.org/show_bug.cgi?id=305072

Toby Fox  changed:

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 CC||toby...@gmail.com

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[gwenview] [Bug 305072] Animated GIF is some milliseconds too slow

[Colin Griffith]

https://bugs.kde.org/show_bug.cgi?id=305072

--- Comment #8 from Colin Griffith  ---
I'm now relatively convinced that this is, in part, caused by bug 420141 (which
I just filed today). However, I'm noticing that even on gifs with alpha
transparency, there's STILL a small amount of slowdown - just not nearly as
much. So while I think that bug helps get to the root of the problem, there's
still something else going on here.

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[gwenview] [Bug 305072] Animated GIF is some milliseconds too slow

[Ancoron]

https://bugs.kde.org/show_bug.cgi?id=305072

Ancoron  changed:

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 CC||ancoron.lucife...@gmail.com

--- Comment #7 from Ancoron  ---
Created attachment 123801
  --> https://bugs.kde.org/attachment.cgi?id=123801=edit
60 seconds countdown analog clock

I've also did some tests here using the attached 60-seconds-countdown.gif file.

It really should be 60 seconds in playback length (by ImageMagick):

$ identify -format ' + %T' 60-seconds-countdown.gif | sed 's/^/(0/; s/$/) \/
100\n/' | bc -l
60.

However, with Gwenview (up to 19.04.3), I got the following playback times
(manually tracked, not precise to the deci-second) related to Gwenview window
resolution:

 256x256  - 01:20 (probably due to additional scaling)
 512x512  - 01:16
1024x1024 - 01:30
2560x1600 - 03:45

Another thing I noticed was that reloading/restarting the GIF (using F5 key)
the playback speed slowed down even more and the CPU usage went up.

After 10 reloads, gwenview was using ~80% of a single CPU core and slowed down
playback from ~01:30 initially to ~05:24 (at 1024x1024 window size), after 20
reloads to ~09:20 at ~88).

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[gwenview] [Bug 305072] Animated GIF is some milliseconds too slow

[Colin Griffith]

https://bugs.kde.org/show_bug.cgi?id=305072

--- Comment #6 from Colin Griffith  ---
By the way, by large I mean resolution-wise.

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[gwenview] [Bug 305072] Animated GIF is some milliseconds too slow

[Colin Griffith]

https://bugs.kde.org/show_bug.cgi?id=305072

Colin Griffith  changed:

   What|Removed |Added

 CC||tyna...@gmail.com

--- Comment #5 from Colin Griffith  ---
Open a large gif, and Gwenview also skyrockets in RAM usage. It's as if it's
keeping every frame in memory, including each loop as new frames it generates
instead of reusing them.

This is a serious issue.

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[gwenview] [Bug 305072] Animated GIF is some milliseconds too slow

[Gustavo Alvarez]

https://bugs.kde.org/show_bug.cgi?id=305072

--- Comment #4 from Gustavo Alvarez  ---
any notice of this bug?

18.04.0 is still affected

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[gwenview] [Bug 305072] Animated GIF is some milliseconds too slow

[Henrik Fehlauer]

https://bugs.kde.org/show_bug.cgi?id=305072

Henrik Fehlauer  changed:

   What|Removed |Added

 CC||rk...@lab12.net

--- Comment #3 from Henrik Fehlauer  ---
Still an issue with a recent Gwenview. More notes:
- In Bug 367868 the animation speed seems to depend on the window size.
- For me, even Firefox and Chromium have different speeds, i.e. Firefox is
faster than Chromium, which is faster than Gwenview.
- Might be worth checking whether only Gwenview is affected, or other Qt apps
as well.

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[gwenview] [Bug 305072] Animated GIF is some milliseconds too slow

[Henrik Fehlauer]

https://bugs.kde.org/show_bug.cgi?id=305072

Henrik Fehlauer  changed:

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 CC||sl1pk...@gmail.com

--- Comment #2 from Henrik Fehlauer  ---
*** Bug 367868 has been marked as a duplicate of this bug. ***

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