(http://itbroadcastanddigitalcinema.com/ffmpeg_howto.html))
===== Programme zur Enkodierung =====
===... Nasenbrecher
if [ -z "$1" ]; then # -n tests to see if the argument is empty
echo "Als Pa... exit 1
fi
if [ -z "$2" ]; then # -n tests to see if the argument is empty
datarate_video="