#!/bin/bash                                                                       

IFS=\"
GSTLAUNCH=gst-launch-0.8
ENCODER=lame
ENCODEOPTIONS=preset=1001 quality=0
INPUTEXTENSION=$1
OUTPUTEXTENSION=mp3

INPUTFILES=`find $2 -iname *.$INPUTEXTENSION -printf %p\"`

usage() {
    echo "Usage is $0 <extension> <path>"
    echo "$0 will transcode all files with the specified extension"
    echo "in the <path> directory, and all subdirectories"
    echo
    echo "Example: "
    echo "$0 m4a Music"
    echo "Will convert all the *.m4a files in the ./Music directory"
    echo "and all it's subdirectories to .mp3 files"
}

if [[ $# != 2 ]] ; then
usage ;
exit ;
fi

for INPUT in $INPUTFILES ;
do OUTPUT=`echo $INPUT | sed s/.$INPUTEXTENSION/.$OUTPUTEXTENSION/` ;
echo "Converting \"$INPUT\" to \"$OUTPUT\"" ;
$GSTLAUNCH filesrc location=\"$INPUT\" ! decodebin ! \
$ENCODER $ENCODEOPTIONS ! filesink location=\"$OUTPUT\" ;
done