Batch Converting Video for Nexus7 with ffmpeg.

The title says it all, I have a folder of videos, and want to have them play on my Nexus 7 Android device.
In other words, I want to be able to do this:-

~$ cd Videos
~$ somescript *.avi|*.mov|*.mpeg

then go to bed and wake up with nexus 7 supported files.

Here is my version of that script.

#! /bin/bash

############################################################
# script to convert video files to nexus (android) devices #
############################################################

HELP="\n
This script will convert video files to the preferred format for android devices\n
It uses ffmpeg to do a 2 pass encoding.\n
See http://patdavila.wordpress.com/2010/03/10/re-encoding-mythtv-recordings-for-viewing-on-your-android-phone/\n
\n
EXAMPLES\n
convert quicktime movies\n
~$ ./android_video.sh video_file.mov\n
\n
convert mpgs\n
~$ ./android_video.sh video_file.mpg\n
\n
convert avis\n
~$ ./android_video.sh video_file.avi\n
\n
wildcard use is supported, and unique filenames for the output 
videos should ensue by simply prefixing .mp4\n
eg.\n
~$ ./android_video.sh *.avi\n
"

 
function show_help {
    echo -e $HELP
    exit 1
}


convert()
{
 SRC=$1
 DEST=$1.mp4
 
 ffmpeg -i $SRC -aspect 16:9 -s 800x480 -vcodec libx264 -b 480k -r 13 -acodec libfaac -ab 128k -sameq -pass 1 -f rawvideo -an -y /dev/null && \
 ffmpeg -i $SRC -aspect 16:9 -s 800x480 -vcodec libx264 -b 480k -r 13 -acodec libfaac -ab 128k -ac 2 -sameq -pass 2 $DEST
}

if [[ "$1" == "" ]]
 then
  show_help
fi

while [[ "$1" != "" ]]; do
 convert $1
 shift
done

exit 1