If "narrative" refers to an account of a set of events thematically connected so that they construct a plot, then I don't see why films aren't narratives. Since the concept doesn't reallly include length in its definition, then the relative compactness of films wouldn't disqualify them.
If, according to a generic definition, however, narrative is differentiated from drama by the presence of a speaker (even if the speaker is the "author") from whose perspective we are given the account and whose perspective plays a role in the emplotment, then to the extent that drama doesn't qualify, neither would film (despite some experiments with first-person camera, so to speak).