swift - AVPlayer:无法播放()mpg 视频

Question

以下简单类不播放视频 URL。我得到的是一个黑色的空屏幕。为什么？

import Foundation
import AVKit
import AVFoundation

class EditShowVideoViewController:AVPlayerViewController {
        override func viewDidLoad() {
            var error: NSError?
            if let urlString = gBlissMedium!.mediumURL {
                let url = NSURL(string: urlString)
                player = AVPlayer(URL:url)
            }
        }

        override func viewDidAppear(animated: Bool) {
            player.play()
        }
        override func supportedInterfaceOrientations() -> Int {
            return Int(UIInterfaceOrientationMask.AllButUpsideDown.rawValue)
        }

        override func prefersStatusBarHidden() -> Bool {
            return true
        }
    }  

(lldb) po urlString "http://files.parsetfss.com/6b8388b7-14c6-431a-a795-2b33f9d47081/tfss-56cf2c67-111c-4724-8e63-3755fe1b85f7-hst_1.mpg"

Answer 1

if let urlString = gBlissMedium!.mediumURL {
                let url = NSURL(string: urlString)
                player = AVPlayer(URL:url)
}

此处player是在viewDidLoad中本地定义的，它应该是该类的实例变量