Rendering does not use full CPU

[DogFilm]

Rendering a clip does not use 100% of CPU.

If I render stuff with ffmpeg directly (nothing to do with kdenlive) ffmpeg
uses all cores with 100% cpu load. Kdenlive is about 50% for each core.  So
render time could probably be doubled.

Yes, "Render Project" dialog was set to "Parallel Processing".
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