Bug 474602 - Slow rendering with mere defish inserted
Summary: Slow rendering with mere defish inserted
Status: CONFIRMED
Alias: None
Product: kdenlive
Classification: Applications
Component: Rendering & Export (show other bugs)
Version: 23.08.0
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: Jean-Baptiste Mardelle
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2023-09-17 00:12 UTC by fehler-im-programm
Modified: 2024-10-02 12:46 UTC (History)
1 user (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
Projectfile "Bug Slow rendering with mere defish inserted.kdenlive" (15.30 KB, application/x-kdenlive)
2023-09-17 00:12 UTC, fehler-im-programm 		Details
testimage3.png (24.52 KB, image/png)
2023-09-17 00:13 UTC, fehler-im-programm 		Details
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Description fehler-im-programm 2023-09-17 00:12:54 UTC 
Created attachment 161663 [details]
Projectfile "Bug Slow rendering with mere defish inserted.kdenlive"

STEPS TO REPRODUCE
1. Insert any Clip twice
2. Insert defish in 1 clip
3. Render and watch frame per second

OBSERVED RESULT
Clip with only defish inserted renders at about 1/3 speed

EXPECTED RESULT
Render speed remains the same

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
Comment 1 fehler-im-programm 2023-09-17 00:13:41 UTC 
Created attachment 161664 [details]
testimage3.png
Comment 2 emohr 2024-09-22 09:31:25 UTC 
I can confirm the issue. If you set in Defish the Interpolator to “Lanczos” rendering goes down to zero frame and uses 50% CPU. I think this cannot be solved until we implement GPU rendering.
Comment 3 fehler-im-programm 2024-09-22 10:00:28 UTC 
(In reply to emohr from comment #2)
> I can confirm the issue. If you set in Defish the Interpolator to “Lanczos”
> rendering goes down to zero frame and uses 50% CPU. I think this cannot be
> solved until we implement GPU rendering.

Ok. Thanks for the hint.