如何在Apple TV中添加带视频的字幕

Question

我正在开发Apple TV应用程序。我有一个Video的URL和一个视频Subtitle的URL。 我想用副标题播放视频。任何人都有解决这个问题的方法

如果你有，请告诉我。

有一个视频网址：＆＃34; https://sample/hls_playlist.m3u8＆＃34;

有一个字幕网址：＆＃34; https://samplesubtitle=AKIAJS5BLYTDP3J5UOFQ&Expires=1507918258&Signature=r%2FcV7UVSejOBYDKFHwMYtrvXUmM%3D＆＃34;

这是我的代码：

 func playVideo(_ videoURL: String) {

    // 1 - Load video asset

    let videoAsset = AVURLAsset.init(url: URL(string:videoURL)!) as AVURLAsset

    // 2 - Create AVMutableComposition object. This object will hold your AVMutableCompositionTrack instances.
    let mixComposition = AVMutableComposition.init()

    // 3 - Video track
    let videoTrack: AVMutableCompositionTrack? = mixComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid)
    try? videoTrack?.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset.duration), of: (videoAsset.tracks(withMediaType: AVMediaTypeVideo)[0]), at: kCMTimeZero)

    // 4 - Subtitle track
    let subtitleAsset = AVURLAsset.init(url: URL(string: self.subtitle!)!)
    let subtitleTrack: AVMutableCompositionTrack? = mixComposition.addMutableTrack(withMediaType: AVMediaTypeText, preferredTrackID: kCMPersistentTrackID_Invalid)

    try? subtitleTrack?.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset.duration), of: subtitleAsset.tracks(withMediaType: AVMediaTypeText)[0], at: kCMTimeZero)




    self.playerItem = AVPlayerItem.init(asset: mixComposition)
    self.playerObj = AVPlayer.init(playerItem: self.playerItem)
    self.playerController?.player = self.playerObj

    self.playerItem.addObserver(self, forKeyPath: Notification.Name.status.rawValue, options: NSKeyValueObservingOptions.new, context: nil)
    self.playerController?.player!.play()

    NotificationCenter.default.addObserver(self, selector: #selector(PlayerViewController.playerItemDidReachEnd(_:)), name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: self.playerObj.currentItem)
}