Bug 422592

Summary: Rendering speed extremly slow, when no filters are applied
Product: [Applications] kdenlive Reporter: Harri <bugs.kde>
Component: Video Effects & TransitionsAssignee: Vincent PINON <vpinon>
Status: RESOLVED FIXED    
Severity: normal CC: bugs.kde, fritzibaby, snd.noise
Priority: NOR Flags: fritzibaby: timeline_corruption+
Version First Reported In: 20.04.1   
Target Milestone: ---   
Platform: Appimage   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Harri 2020-06-07 19:02:15 UTC 
SUMMARY
Rendering an video with h264 or h265 is extremly slow when no filters are on the video.That means: When I render a video using any filter (even a dummy-"Transform" on Master Effects will do) it will take about 60 minutes for a 15 minute video. When I do the same video without any filter then rendering takes about 11 hours (11 times as much). Cpu usage is 100% on all cores in either case.
This strange effect is independent of the video, raw format and so on.

STEPS TO REPRODUCE
1. render a short movie without any filter from mp4 input.
2. render the same movie using any filter, you can try "Transform" without giving it anything to do.
3. whatch the rendering times.

OBSERVED RESULT
rendering takes much longer without filter.

EXPECTED RESULT
rendering should take longer with filter.

KDENLIVE-VERSION
kdenlive-20.04.1b-x86_64.appimage

SOFTWARE/OS VERSIONS
Operating System: openSUSE Leap 15.1
KDE Plasma Version: 5.18.90
KDE Frameworks Version: 5.70.0
Qt Version: 5.15.0
Kernel Version: 4.12.14-lp151.28.48-default
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-7700K CPU @ 4.20GHz
Memory: 31,3 GiB Arbeitsspeicher
Graphics Processor: GeForce GTX 1060 6GB/PCIe/SSE2
Comment 1 farid 2021-03-10 19:51:55 UTC 
This is odd, can you reproduce this in latest appimage?
Comment 2 Harri 2021-03-10 20:15:24 UTC 
(In reply to farid from comment #1)
> This is odd, can you reproduce this in latest appimage?

well, as the latest appimages cannot render anything on openSuse 15.2 (see https://bugs.kde.org/show_bug.cgi?id=430852) - i cannot reproduce this bug.
Comment 3 farid 2021-03-10 20:52:37 UTC 
(In reply to Harri from comment #2)
> (In reply to farid from comment #1)
> > This is odd, can you reproduce this in latest appimage?
> 
> well, as the latest appimages cannot render anything on openSuse 15.2 (see
> https://bugs.kde.org/show_bug.cgi?id=430852) - i cannot reproduce this bug.

Would be nice to get some debugging, open a terminal, run kdenlive and render. What do you get?
Comment 4 Harri 2021-03-14 19:54:59 UTC 
not reproduceable with 20.12.3

close issue