Hi,

what I'm doing wrong or what I can do to use all 4 cores of my CPU during render a video in kdenlive.
I follow the Youtube tutorial https://www.youtube.com/watch?v=PytyNRd5R40 but this solves not
my problem. Still only one CPU is used. It worked with 4 cores a long time ago in older kdenlive version.

CPU: i5-3570K
RAM: 16GB
OS: OpenSuse Leap 15.1
kdenlive Version: 18.12.3

Example:

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RENDERER="/usr/bin/kdenlive_render"
MELT="/usr/bin/melt"
SOURCE_0="file:///media/USB3-Disk/kdenlive/scripts/2019-Frankreich_001.sh.mlt"
TARGET_0="file:///media/USB3-Disk/Videos/2019-Frankreich.mp4"
PARAMETERS_0="-pid:19191 in=0 out=288894 $MELT atsc_1080p_50 avformat - $SOURCE_0 $TARGET_0 properties=x264-medium f=mp4 vcodec=libx264 acodec=aac g=120 crf=24 ab=128k preset=ultrafast threads=4 real_time=-4"
$RENDERER $PARAMETERS_0

Solution for me was:

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     taskset --pid --all-tasks --cpu-list 0-3 <pid of kdenlive_render>
     taskset --pid --all-tasks --cpu-list 0-3 <pid of melt>