https://bugs.kde.org/show_bug.cgi?id=502037
Bug ID: 502037
Summary: Set `real_time` attribute to negative CPU cores to
speed up rendering
Classification: Applications
Product: kdenlive
Version: 24.12.3
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: Rendering & Export
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
When kdenlive generates the XML file it passes to melt for rendering, it gives
the `<consumer>` element the attribute `real_time="-1"`. As a result, melt will
only use one thread to do frame rendering.
The speed of rendering (especially when visual effects are involved) can be
improved tremendously by setting this to the negative of the number of CPU
cores instead. In my case, that would be `real_time="-8"`. The negative ensures
no frame drops.
Since my system has no GPU, my experiments here apply only to CPU-based
rendering. Depending on how GPUs are utilized, it may or may not be beneficial
to do this only if no GPU is involved.
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