Cowon d2 avi file support

I bought a new cowon d2 portable media player and it's sounds great.

I can't play the avi downloaded from the internet. I need to convert this avi using the below command to play it

mencoder Kallai_Mattum_Kandal.avi -o Kallai_Mattum_Kandal_Cowon.avi -ovc lavc -vf scale=320:240 -oac mp3lame -lavcopts vmax_b_frames=0:acodec=mp3:abitrate=128:vbitrate=256

for i in $*
do
mencoder $i -o $i"_Cowon.avi" -ovc lavc -vf scale=320:240 -oac mp3lame -lavcopts vmax_b_frames=0:acodec=mp3:abitrate=128:vbitrate=256 -mc 30
done

The above makes the player to play the file with good video and sound.