VENICE, Italy (AP) — A film in which art and fame battle it out in the streets and skies of Manhattan has kicked off the 71st Venice Film Festival, where high-art aspirations mix with Hollywood hopes. Alejandro Gonzalez Inarritu's "Birdman" stars former "Batman" Michael Keaton as an over-the-hill action star struggling to recover a sense of self-worth by mounting a heavyweight Broadway play.