https://bugs.kde.org/show_bug.cgi?id=435653
Bug ID: 435653
Summary: Huge performance penalty when using "Cut edge"
Product: kdenlive
Version: 20.12.3
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Effects & Transitions
Assignee: vpi...@kde.org
Reporter: pos...@posteo.eu
Target Milestone: ---
SUMMARY
I'd like to cut away 100px of a 4k@30 video using the "cut edge" effect.
With it KDEnlive uses around 14% of CPU resulting in roughly 27 fps.
If I activate the checkbox "Automatic central cut", which however reverts my
aim to cut the lower 100px, I see around 40% of CPU usage resulting in roughly
114 fps.
Command for rendering:
f=mp4 movflags=+faststart vcodec=libx264 progressive=1 g=15 bf=2 crf=%quality
acodec=aac ab=%audiobitrate+'k'
The encoding slider is set to the far right (maximum) and #threads to 24, using
the parallel processing feature.
Is there a some bottleneck in the effect's code respectively could it be speed
up?
SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux
KDE Plasma Version: 5.21.3
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2
Kernel Version: 5.12.0-1-MANJARO
OS Type: 64-bit
Graphics Platform: X11
Processors: 24 × AMD Ryzen 9 5900X 12-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: Radeon RX 580 Series
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