The Key Conventions of Film Openings

• Film title
• Company logos
• Credits; actors, producers, directors etc
• Music; diegetic or non-diegetic sounds 
• Sound affects
• Establishing shot of the setting or scene
• 2-5 minutes long
• Introduction to the plot
• Establishing genre
• Starts with equilibrium
• Main protagonist or someone relevant to the plot
• Vague introduction to the plot