There is some info, the EXIF stores a lot of meta data. Soft like Picasa does read it and use it. But Picasa also adds info store elsewhere …
I just look at MPlay for the Roku HD1000, if you put a file with some specific info in it, the app, see’s it and uses it for display, so cover art, imdb info and so on can be used even if the mpeg does not contain all of it.
Patrick S.