Bug 435793

Summary:	100% CPU usage when playing 4K clip that VLC plays at 15% CPU
Product:	[Applications] kdenlive	Reporter:	Dan Dascalescu <ddascalescu+kde>
Component:	Rendering & Export	Assignee:	Jean-Baptiste Mardelle <jb>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	berndmj, fritzibaby
Priority:	NOR	Keywords:	triaged
Version First Reported In:	20.12.3	Flags:	fritzibaby: Brainstorm+
Target Milestone:	---
Platform:	Appimage
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	CPU usage

Description Dan Dascalescu 2021-04-16 00:40:33 UTC

Created attachment 137646 [details]
CPU usage

When I play 4K clips in Kdenlive like this one[1], CPU utilization goes to 100% on all 8 cores. Changing the preview resolution to 270p doesn't help at all.

My laptop is a ThinkPad X1C with 16GB RAM and Mesa Intel UHD Graphics 620.
I’m using KDE Neon 5.21.4 on X11. The Configuration wizard says "no hardware encoders found" and "Using MLT 6.25.0".

VLC plays the same clips at under 15% CPU utilization.

My goal is to scrub rapidly through clips, but dragging the playhead takes ~2 seconds to seek.

[1]: https://drive.google.com/file/d/1WZsD2bXUJvvCMYVKSbuID539y4WVZ4NZ/view?usp=sharing

Comment 1 emohr 2021-04-23 16:47:22 UTC

Thank you for reporting. Here similar findings https://invent.kde.org/multimedia/kdenlive/-/issues/811 . Memory and CPU using will be checked in the near future.

Comment 2 Bernd 2024-12-24 00:34:49 UTC

Hi and thank you for your patience.

Can you please check whether this issue still exists in the latest version 24.12.0?

If yes, please update this report to reflect the new version and set the status to CONFIRMED.

If it works now like you expect it would, you may change the status of this report to RESOLVED - FIXED.

At any rate, this report will be closed if there is no activity for the next 30 days.

Comment 3 Bug Janitor Service 2025-01-08 03:47:47 UTC

🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!

Comment 4 Bug Janitor Service 2025-01-23 03:47:38 UTC

🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.