A couple of days ago, I bought a Sony NWZ-A816 4gb player, and it is being very, very annoying when it comes to video playback. According to the manual, the video format it supports is mp4. Now I have tried many different convertors to convert many different video file types, wmv, mpg, mpeg, avi, to mp4 format, and yet when I try and put them on my player, I keep getting the message that it is not a file type supported by the player. In fact the only type of file I have been able to actually put on the player at all is wmv, which the player then wont recognise as being on it anyway. It is seriously annoying me, does anyone have any ideas what might be up??