So I've repurposed my iPod 5G as a video holder for my kids for car rides. I have a ton of videos in iTunes, bought and burnt, and notice that only certain movies are able to transfer on to the iPod. At first I thought they didn't transfer because they were HD movies and maybe the iPod doesn't support them. But then I put those HD movies in Handbrake and formatted them to no larger than 640 and they still don't transfer. What gives???