Gérard Genette in "Discours du Récit"
Discourse - is the text that you read. (the film that you see)
Story - is the events and conflict in narrative fiction.
Narration - how a text is written and communicated. (how a movie is filmed)
"Story and Discourse" by Seymour Chatman
«Film shows us an illusory real world that resembles to the point of confusion the world we know ourselves, a world into wich we are free to peep for a couple of hours without participating.»
Chatman uses a duality of analyses, on which, story is the what and discourse is the way.
Film is a complex system of successive, encoded signs. (Metz, 1974)