Running iTunes 11.0.3 on OSX 10.8.3 and just tried to do this: iTunes > File > Add to Library for a MP4 video file specs as follows: Kind: MPEG-4 Movie Dimensions: 720 X 480 Codecs: H.264, AAC Audio channels: 2 I did not receive an error or beachball during this. I looked under Movies for "Unwatched", "Movies", "Genres", "Home Videos", "List" and could not find these videos anywhere. The videos play just fine in Quicktime. Is there something wrong with the MP4 type that would require me to convert it first before iTunes will add it? Any help is appreciated!