AVPlayerLayer 显示黑屏但声音正常

我正在尝试在中显示本地录制的视频AVP播放器层哪个有效有时。我可以听到录制视频中的音频，但看不到视频。有时视频和音频都可以工作，有时只有音频。

我都尝试过AVP播放器层 and AVPlayerViewController但这两种情况都会出现同样的问题。所以这不是因为框架错误。

示例代码AVPlayerViewController:

let player = AVPlayer(url: url)
let playerController = AVPlayerViewController()
playerController.player = player

self.present(playerController, animated: true) {
  player.play()
}

示例代码AVP播放器层:

let asset = AVAsset(url: url)
let item = AVPlayerItem(asset: asset)

self.player = AVPlayer(playerItem: item)
self.player?.addObserver(self, forKeyPath: "status", options: NSKeyValueObservingOptions(), context: nil)
self.playerLayer = AVPlayerLayer(player: self.player!)
self.playerLayer?.frame = imageView.bounds
imageView.layer.addSublayer(self.playerLayer!)

Edit 1:

在观察玩家的状态时，error is nil和status is readyToPlay

Edit 2:

如果 URL 是远程的，则工作正常。

Edit 3:

如果我在视频完成导出后等待几秒钟，似乎可以工作。是否是文件未 100% 写入文件系统的原因？

Edit 4: Video问题的根源，在本例中，它播放了第三次。

这是我在视频工作时设置 AVPlayerLayer 的方法（我认为您缺少的是videoGravity范围）。

let bundle = Bundle.main
let moviePath = bundle.path(forResource: "myVideo", ofType: "mp4")
let moviePlayer = AVPlayer(url: URL(fileURLWithPath: moviePath!))

playerLayer = AVPlayerLayer(player: moviePlayer)
playerLayer.frame = movieView.bounds
playerLayer.videoGravity = AVLayerVideoGravityResizeAspect
movieView.layer.addSublayer(playerLayer)
playerLayer.player?.play()