Shell script to downsample podcasts

I have a very basic mp3 player with only 128 MB memory. I mostly listen to podcasts which are automatically downloaded by Amarok into the folder ~/.kde/share/apps/amarok/podcasts/data. In order to fit many of them to the limited memory and to have them available from anywhere, I have been writing a script that automatically downsamples them as they arrive and puts them online to my web server. The script is executed hourly by the crontab. The relevant files look like this:

server:/etc/cron.hourly> more podcast_convert.sh
#!/bin/bash
/home/marzena/bin/podcast_convert.sh /home/marzena/.kde/share/apps/amarok/podcasts/data/*.mp3

server:~/bin> more podcast_convert.sh
#!/bin/bash
if [ $1 = "/home/marzena/.kde/share/apps/amarok/podcasts/data/*.mp3" ]
then
echo "$1: No files to process!"
exit 1
else
while [ $# -ge 1 ]; do
infn=$1
echo "Infile = "$infn
strippedinfn=`basename $1`
strippedinfn=${strippedinfn//:/}
echo "Stripped Infile = "$strippedinfn
outfn="/srv/www/htdocs/vhosts/jeltsch.org/podcasts/${strippedinfn%%.mp3}_LQ.mp3"
echo "Outfile = "$outfn
if test ! -f $outfn
then
echo "Downsampling $outfn."
lame --mp3input -V 3 --strictly-enforce-ISO --resample 12 $infn $outfn
else
echo "The file $outfn has been already downsampled. Skipping..."
fi
# rm $infn
shift 1
done
fi