12 Years a Slave: Steve McQueen defends brutal portrayal.

An eagerly awaited - and controversial - new movie is having its New York Film Festival premiere. 12 Years a Slave is said to be one of the most brutal and realistic depictions of slavery ever to have made it to the big screen.

It is based on a true story - and it's been directed by an outsider - British filmmaker Steve McQueen.

Tom Brook spoke to the director along with two of the movie's stars Chiwetel Ejiofor and Michael Fassbender.