Psychological thriller Black Swan, starring Natalie Portman, will open this year's Venice film festival. The film, from US director Darren Aronofsky, also features Vincent Cassel and Winona Ryder. It centres on the rivalry between two dancers at a cutthroat ballet company in New York. Aronofsky won Venice's top prize, the Golden Lion, in 2008 with The Wrestler, which starred Mickey Rourke. The Venice festival runs from 1-11 September. The full line-up will be unveiled later this month. US director Quentin Tarantino is heading this year's jury.