Shell script to demonstrate generation loss in an audio file

genloss.sh

#!/bin/sh

COUNT=0
MAX=50
SOURCE='source_file.flac'
FORMAT='genloss%03d.mp3'
FLAGS='-b:a 128k'

while [ $COUNT -lt $MAX ]; do
	if [ $COUNT -eq 0 ]; then
		PREV="$SOURCE"
	else
		PREV=`printf "$FORMAT" $COUNT`
	fi

	COUNT=$(($COUNT + 1))

	CUR=`printf "$FORMAT" $COUNT`

	ffmpeg -i "$PREV" $FLAGS "$CUR"
done