Using UIImagePickerController to select video

Merged with How do I pick and record video using UIImagePickerController for iPhone?.

I'm trying to design an app that can play videos/media off an IPad. I'm wondering 开发者_如何学编程if it's possible to use the UIImagePickerController to pick out video files that are stored on the IPad that aren't located in the Camera Roll. When I use UIImagePickerControllerSourceTypeSavedPhotosAlbum as the source I can get at photos/videos taken by the IPad but nothing else. When I use UIImagePickerControllerSourceTypePhotoLibrary as the source my program crashes before the picker displays anything. My photo library contains a number of files, some taken by the IPad itself and others I inserted through iTunes. Any ideas?