re-encoding mp3 audio files

After looking around on the internet searching for a tool to re-encode mp3 files which preserves the id3 tag information and not finding anything I wrote a little bash script. It also solves the problem that my cell phone Motorola RazR v3xx is refusing to catch the id3 information of most mp3 files.

It needs two programs:

lame
mp3info

You can install them using sudo apt-get install lame mp3info or another package manager of your choice.
Save the following code in a file called reencmp3 and follow the instructions below (don'f forget to make it executable!).

#!/bin/bash 
# written by oerms@gmx.net
# reencode mp3 with with VBR and defined minimum bitrate
#
# usage: "reencmp3 112" with the mp3s in the current working directory
#
# Encoding with a minimum of 112kbps yields files slightly 
# bigger than CBR 128kbps but of much better quality.
# 
out="$PWD"\ reenc""
mkdir "$out"

for i in *.mp3; do
 lame -h -v -b "$1"\
 --tt "`mp3info -p "%t" "$i"`"\
 --ta "`mp3info -p "%a" "$i"`"\
 --tl "`mp3info -p "%l" "$i"`"\
 --ty "`mp3info -p "%y" "$i"`"\
 --tc "`mp3info -p "%c" "$i"`"\
 --tn "`mp3info -p "%n" "$i"`"\
 --tg "`mp3info -p "%g" "$i"`"\
 --space-id3v1\
 "$i" "$out/$i"
done

The script is to be executed in the directory where all the mp3 are that are to be converted. If for example all your mp3 are in /foo/bar, you do a cd /foo/bar and then call the script /dir/of/script/reencmp3 112.
It then takes all files that end on *.mp3 and is re-encoding them with variable bitrate and saving them into the directory /foo/bar reenc/.
As you can see it takes one parameter, indicating the minimum bitrate used for encoding.

If you want to modify the file the following parameters might be useful to you:

## mp3info parameters
#%a     artist [string]
#%c     comment [string]
#%g     musical genre [string]
#%l     album name [string]
#%n     track [integer]
#%t     track title [string]
#%y     year [string]

##lame parameters
#--tt title
#--ta artist
#--tl album
#--ty year
#--tc comment
#--tn track[/total]
#--tg genre
#--space-id3v1

UPDATE:
My cell plays the music quite loud which annoys me (and is not very healthy either). I modified the lame line with the parameter

--scale 0.1

Now it is not as loud as before and everything is fine.
The same parameter can be used to increase the volume, just enter a value >1.