Concatenate multiple MP3s into a single MP3

tomp3

#!/bin/bash
# concat multiple mp3 files into a single mp3
# installation:
#   chmod +x tomp3 and save to /usr/local/bin/tomp3
# usage: tomp3 <DIR> [NAME]
#   finds all mp3 files in DIR, writes a single mp3 to NAME.mp3
# set NAME to --preview to list mp3s in the order they will
# be concatenated.
# requires: ffmpeg

SRC=$1
MP3S=$(find "$SRC/" -name "*.mp3" | sort -V)
if [[ "$2" == "--preview" ]]; then
	echo "$MP3S"
	echo -n "==> previewed "
	echo "$MP3S" | wc -l
	exit 0
fi
OUTRELA="$2"
if [[ "$OUTRELA" = "" && "$1" != "" ]]; then
	OUTRELA="$1"
fi
OUT=$(readlink -f "$OUTRELA")
LIST=$(echo "$MP3S" | perl -pe 'chomp if eof' | tr '\n' '|')
CMD="ffmpeg -i \"concat:$LIST\" -vn -acodec copy \"$OUT.mp3\""

#debug
#echo "running:"
#echo "$CMD"

echo "$CMD" | bash