A generic term for both books and movies?

Try works. I don't think there's a term that covers specifically books and movies other than just naming them as what they are.

Brain candy

Might be a fairly slang, even sarcastic, way of describing such entertainment materials.

Pieces

A piece of art, a play piece, a piece as in script, a piece as in book, and a movie (piece).

fiction is a good word to use for describing both books and movies