Film Trailers : Theory

I have been researching the theortetical side of film trailers. As an example I have been looking at the marketing campaign for the film 'Buried' which has just been released in the UK. I thought this would be a good film to look at as it has just been released and is also of a similar genre to the trailer that I will be making therefore I can look at the way they have marketed this film and follow similar conventions in my own trailer.