$ cat composite_001.sh
#! /bin/sh

SOURCE="/home/zenny/kdenlive/scripts/composite_001.sh.mlt"
TARGET="/home/zenny/kdenlive/composite_001.mp4"
RENDERER="/usr/bin/kdenlive_render"
MELT="/usr/bin/melt"
PARAMETERS="-pid:8518 $MELT atsc_1080p_30 avformat - $SOURCE $TARGET properties=x264-medium g=120 crf=18 ab=192k progressive=1 threads=4 real_time=-1"
$RENDERER $PARAMETERS