Ruby Stockwell AS Media: Conventions of an OTS

Core conventions of an opening sequence to a film:

Title
Main Actors
Short scene
Production company
Director
Distribution company
Opening credits

Conventions of Title Sequences from reigatemedia
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Why does an opening title sequence include these?

An opening title sequence must include some information about the film (such as main actors, production company, title) so you know what film you're about to watch. Some opening title sequences may include brief scenes of the following movie, I prefer opening title sequences that do this, as it gives the viewer an idea of the film, and is a good way of anticipating whether you'll enjoy the film.
Although the opening title sequence should include part of the film, it shouldn't give away too much of the plot or the viewer will already know the story and so will not be interested in wasting an hour or so watching.
A good opening title sequence should end on a cliff hanger, as the viewer will be thrilled and anticipating what the film will include.