Hi.. Actually encountered some problems with certain movies i tried to transfer onto my ipod classic. However some of these movies(mp4 format) can be played on my psp but not on my ipod classic. I tried using 3gp converter to convert the file to ipod mp4 format but get an error everytime I do that. Can anyone help by explaining if there actually is a difference between the mp4 format for ipod and psp? thanks in advance..