override func viewDidLoad() {
    super.viewDidLoad()

    let url = URL(string: "http://devimages.apple.com/iphone/samples/bipbop/gear1/prog_index.m3u8")
    let player = AVPlayer(url: url!)
    let playerController = AVPlayerViewController()
    playerController.player = player
    self.addChildViewController(playerController)
    self.view.addSubview(playerController.view)
    playerController.didMove(toParentViewController: self)
    playerController.player?.play()
}