As the heading says. I put my mp3s and mp4s into itunes library fine. The mp4s plays fine in itunes. But then when I sync the itouch, only the mp3s go into the itouch and the mp4 refuse to go in Please Register or Log in to view images. Really scratching my head over this Please Register or Log in to view images and hopefully it's just smth I'm doing wrong. Thx in advance for any help given.