for i in *.avi; do ffmpeg -i "$i" source_video.avi input -acodec aac -ab 128kb -vcodec mpeg4 -b 1200kb -mbd 2 -flags +4mv+trell -aic 2 -cmp 2 -subcmp 2 -s 320x180 -title X "`echo $i |sed 's/.avi$/.mp4/'`" ;done