Conventions  of a film opening  usually uses sound, editing, various camera shots and mise en scene these techniques to help protray ideas about the movie to audiences

In flim openings you will usally have the production logo. In this case which is warner bros. pictures.
production logo is most common in all flim openings.

Another conventional is the title is always shown in all openings however how its shown is different.
An example is for this opening deadcalm comes up on the screen slowly and in red this is linked to the title and also maybe the film.

Also in a film openings they write the cast members of the film, this is useful for the audience because it allows the audience to see who is staring in the movie.

Most film opeing starts of with diogetic sounds. This could indicate what type of flim it is meaning if its a fast beat tempo then it might be a action film .