如何在AVPlayer中获取HLS流的视频大小？

Question

我正在尝试在播放hls流时获得视频分辨率.我有典型的玩家初始化:

let urlAsset = AVURLAsset(URL: currentVideoUrl)
 self.player=AVPlayer(playerItem: AVPlayerItem(asset:urlAsset))
 .......

我使用KVO,当我获得AVPlayerItem的.ReadyToPlay状态时,我尝试获取视频大小:

    func resolutionSizeForVideo() {

    guard let videoTrack = self.player.currentItem?.asset.tracksWithMediaType(AVMediaTypeVideo).first else
    { return
    }

    let size = CGSizeApplyAffineTransform(videoTrack.naturalSize, videoTrack.preferredTransform)
    let frameSize = CGSize(width: fabs(size.width), height: fabs(size.height))
    print ("video size: \(frameSize)")

}

问题是tracksWithMediaType()总是返回空数组(但适用于非流文件,例如.mov).

如何在AVPlayer中播放HLS视频的大小(CGRect)？

Answer 1

您是否能够使用此方法至少记录视频信息？

func checkVideoRez(videoURL: NSURL) -> Bool {

let videoAssetSource = AVAsset.init(URL: videoURL)
let videoTrack = videoAssetSource.tracksWithMediaType(AVMediaTypeVideo)[0]
let size = videoTrack.naturalSize
let txf = videoTrack.preferredTransform

let realVidSize = CGSizeApplyAffineTransform(size, txf)

print(videoTrack)
print(txf)
print(size)
print(realVidSize)

...

}

Answer 2

使用HLS时,曲目将始终返回nil.如果你有一个UIView子类layerClass用AVPlayerLayer 覆盖它来播放视频你可以得到大小

playerView.layer.videoRect

这只是视频而不是整个图层的大小.

或者,您可以使用KVO观察项目的presentationSize

player.addObserver(self, forKeyPath: "currentItem.presentationSize", options: [.Initial, .New], context: nil)