Although Mediaplayer does a rather good job of retrieving moviedata when a movie is selected there are some serious shortcomings that should be on the list for improvements.
MP’s retrieval is rather slow and I would like to prefer to put on my NAS next to moverxyz.mp4 a picture like moviexyz.whatever. MP should show this picture as a default and only when this is not available retrieve it from the Internet.
Alternatively MP could retrieve and then store the information (on the NAS, please not on aTV) which would also allow users to change it.
Also worth considering is using the information contained in many/most .m4v. Personally I would like that very much.
BTW, from where is presently the information retrieved.