what is the difference between a film opening and a film trailer

Film Opening

- Enigma codes

- Character Roles, limited to Hero

- Establishing Shot, setting

- Action Shots or codes

- Hint towards disequilibrium

- Varied Shots

- Titles

- Do we want to carry on watching

- Music, does it fit the gone

Film Trailer

- Provides summary of plot outline

- Enigma Codes

- Character Roles, more clearly defined

- Short varied clips from entire film

- Clear idea of equilibrium, disequilibrium and new equilibrium