vlc transcoding entire folder

Here is a script to use vlc to transcode videos stored in a folder :

#!/bin/sh
DIR_TRANS='transcoded'

mkdir -p $DIR_TRANS

for filename in `ls *.mp4`
do
 vlc $filename ":sout=#transcode{vcodec=h264,vb=1200,scale=1,acodec=mp4a,ab=256,channels=2}\
:duplicate{dst=std{access=file,mux=mp4,dst=$DIR_TRANS/$filename}}" --play-and-exit
done