But a reading is not an essay.  You do not need to come to a conclusion or give any background to the film.  You do not even need to summarise the film itself.  But you should say what genre we are dealing with and briefly explain where the extract occurs in the film.

You analysis should then move through the extract in chronological order, explaining how the spectator is bringing expectations to the act of making sense of the sounds and images as they pass before the eyes.  It may also be that the extract is deliberately provoking these 'knowledges' in the spectator.

Therefore, because this is a macro reading, you should pay attention to the 'bigger' ideas that may be operating.  These might be to do with how the audience is being prepared for what will happen, or how something that has already happened in the film is being developed; it may be to do with how certain generic elements are being used (the gunfight in the western etc.); it may be to do with how the actor is reproducing another type (when Arnie says, "I'll be back!" for example); it may be to do with how another film is being referred to in, say, the music.

A 'macro' extract can be up to about seven minutes long and your close analysis can go up to 1500 words.