AVPlayerViewController不播放按url的視頻

我試圖通過在AVPlayerViewController中的URL播放視頻。 AVPlayerViewController設置在我的故事板中，並且segue連接正常工作，但播放按鈕被劃掉，視頻將不會播放。那我能做些什麼？我已經測試了以編程方式創建AVPlayerViewController並添加了「允許任意加載」。還是行不通。AVPlayerViewController不播放按url的視頻

performSegueWithIdentifier("videoImpression", sender: self)  

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 

    if (segue.identifier == "videoImpression") { 
     let destination = segue.destinationViewController as! AVPlayerViewController 
     let url = NSURL(string: "http://download.wavetlan.com/SVV/Media/HTTP/H264/Other_Media/H264_test8_voiceclip_mov_480x320.mov") 
     destination.player = AVPlayer(URL: url!) 
    } 
}

screenshot of videoplayer

來源

2016-02-27 Michael Knoch

它可能涉及到運輸的安全性，則使用URL 「HTTP：」 http://stackoverflow.com/questions/31254725/transport-security-has-blocked-a-cleartext-http – pkis