Convert mkv file to avi file. Applicable to a list of files. Uses xargs for parallel processing.

convert-mkv-avi.sh

#!/bin/bash
shopt -s nullglob
source_files=(/home/kuntal/Videos/Tom.and.Jerry.The.Golden.Collection.Volume.One.720p.BluRay/*.mkv)

convert() {
    source_file=$(echo $0 | cut -f1 -d:)
    target_file=$(echo $0 | cut -f2 -d:)
    echo "source file: $source_file"
    ffmpeg -i $source_file $target_file
    echo "converted file: $target_file"
    sleep 1
}

export -f convert

for source_file in "${source_files[@]}"; do
	filename="${source_file%.*}"
	target_file="$filename.avi"
	echo "$source_file:$target_file"
done | xargs -t -I{} --max-procs=3 bash -c convert "{}"