https://bugs.kde.org/show_bug.cgi?id=409874
Bug ID: 409874
Summary: Rendering speed is much faster when kdenlive window is
minimized
Product: kdenlive
Version: 18.12.1
Platform: Other
OS: MS Windows
Status: REPORTED
Severity: normal
Priority: NOR
Component: Video Display & Export
Assignee: j...@kdenlive.org
Reporter: dghand+kde_b...@gmail.com
Target Milestone: ---
Created attachment 121562
--> https://bugs.kde.org/attachment.cgi?id=121562&action=edit
kdenlive project file which demonstrates difference in rendering speed
SUMMARY
Rendering speed is much faster when the kdenlive window is minimized (which
means rendering is slower when the window is not minimized). It is >=2x faster
when minimized.
Render time:
kdenlive minimized: 1 minute, 10 seconds
kdenlive maximized: 3 minutes, 54 seconds
STEPS TO REPRODUCE
1. Create a project from some pictures, apply some complex effects to the
pictures (Wave/Dust/Blur/Pixelize)
2. Render project using H.264 in the Lossless/HQ section. Click "Render to
File"
3. After clicking "Render to File" minimize the kdenlive window
4. Repeat the same process (with a unique output filename) while keeping the
kdenlive window open
OBSERVED RESULT
Render time is much longer when kdenlive window is not minimized.
Lower CPU utilization of the rendering can also be observed in Windows' Task
Manager.
EXPECTED RESULT
Render time would be similar when kdenlive window is open or minimized.
SOFTWARE/OS VERSIONS
Windows: Windows 10 (version 1709), OS Build 16299.1217
KDE Frameworks Version: 5.52.0
Qt Version: 5.11.3 (built against 5.11.2)
ADDITIONAL INFORMATION
The difference in render speed between minimized/not minimized has been seen in
other projects as well.
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