Bug 483931

Summary:	Flatpak or AppImage versions of Kdenlive render very slowly (low CPU usage)
Product:	[Applications] kdenlive	Reporter:	cippo1995
Component:	Rendering & Export	Assignee:	Jean-Baptiste Mardelle <jb>
Status:	CONFIRMED ---
Severity:	normal	CC:	fritzibaby, vinceff
Priority:	NOR	Keywords:	triaged
Version First Reported In:	24.02.0
Target Milestone:	---
Platform:	unspecified
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description cippo1995 2024-03-18 19:50:52 UTC

Rendering on Flatpak or AppImage versions of Kdenlive is a lot slower than using the one from Fedora's repository.
It seems like that Flatpak and AppImage are limited to 1 core.

For example on Flatpak or AppImage my last project would take 1 hour and 40 minutes to render (<20% CPU usage).
On the one from Fedora's repository it would take 22 minutes (>80% CPU usage).

I'm using Fedora 39.

Comment 1 vinceff 2024-06-11 07:45:39 UTC

Same trouble, with a very slow rendering. 40min for 20min video.
Few cores are used but at less than 30%.... With parallel rendering.

AMD 5800X
AMD 6950XT
32 GB ram  

I tested all versions arch, flatpak or appimage, all are impacted when kdenlive is 24.05.
Tested also with debian.

Comment 2 emohr 2025-02-18 14:19:01 UTC

Thank you for reporting.

This is a known issue as Kdenlive has to render all effects by CPU. You can try rendering with GPU profile, nevertheless Kdenlive has to switch back to CPU for the effect rendering.

GPU effects and GPU rendering is on the roadmap as mid term goal.