Transform mp3 files to CBR 128

mp3_cbr_converter.sh

#!/bin/bash
# This script converts all MP3 files in the current directory to a
# constant bitrate (128 in this case) using lame. I use this to make
# a more compact version of my music library to fit in a CD for my car.
#
# WARNING: search is recursive and files WILL BE OVERWRITTEN. You probably
# want to make a copy of the files to be converted.
#
# Notes:
#   * id3 tags are lost when converting with lame.
#   * Files are always picked from the current directory, it would be better
#     to receive the directory as an argument.

BITRATE=128
IFS="
";

for file in `find . -type f -iname '*.mp3' -print0 \
		| xargs -0 mp3info -x -r v 2>/dev/null \
		| grep File: \
		| cut -d ' ' -f 2-`; do
	if mp3info -x -r v "$file" 2>/dev/null | grep kbps | grep -v "128 kbps" >/dev/null
	then
		name=`echo "$file" | awk -F "*.mp3" '{ print $1 }'`
		lame -b $BITRATE -h "$file" "$name-new.mp3"
		if [ $? ]; then
			mv "$name-new.mp3" "$file"
		else
			echo "Error processing $file, left unaltered." > /dev/stderr
			rm "$name-new.mp3"
		fi
	fi
done