https://bugs.kde.org/show_bug.cgi?id=435793

            Bug ID: 435793
           Summary: 100% CPU usage when playing 4K clip that VLC plays at
                    15% CPU
           Product: kdenlive
           Version: 20.12.3
          Platform: Appimage
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Video Display & Export
          Assignee: j...@kdenlive.org
          Reporter: ddascalescu+...@gmail.com
  Target Milestone: ---

Created attachment 137646
  --> https://bugs.kde.org/attachment.cgi?id=137646&action=edit
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

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