I've got some MP4 files I created with VisualHub and I think the pixel shape is somehow set incorrectly. QT and iTunes display the video correctly, but the aspect ratio is wrong on my iPod and on VLC. The file is the correct number of pixels on each axis, but displays incorrectly on some players. So, any application that will reset the pixel shape in the header without reencoding the video? Will QTPro do it? I'd consider buying it if I was sure it would do what I need (I also have this problem playing some .avi files on my multiformat DVD player, so this feature alone would be worth the $30), but since there's no demo I can't be sure. Can anyone help out with some advice, whether it be about QTPro or another app?