What are the conventions of film openings?

Typically, film openings contain:

• the title
• the names of the director, cast etc
• music  (which often sets the mood)
• the institutional identity/logo for the production + distribution company
•  the setting/location
• an introduction to at least 1 main character
• diegetic + non diegetic sound combination

Classic Opening 

•  Establishing a city scape building
• Long shot of window
• Close up of  window  into the room
• Then we are introduced to the main characters