ios - AVCaptureFileOutputRecordingDelegate函数给出的URL无法播放

Question

我正在尝试创建一个类似 Snapchat 的应用程序，用户可以在其中通过按住按钮来拍摄视频。但是，当用户完成拍摄视频并且委托(delegate)调用 fileOutput 时，无法使用 AVPlayer 播放给定的 url outputFileURL。我知道视频实际上是录制的，因为我可以将文件上传到 Firebase 并从那里下载。

这是我的 fileOutput 函数代码:

func fileOutput(_ output: AVCaptureFileOutput, didFinishRecordingTo outputFileURL: URL, from connections: [AVCaptureConnection], error: Error?) {
    if error == nil {
        videoURL = outputFileURL
        flipHiddenViews()

        // playback video
        player = AVPlayer(url: outputFileURL)
        playerLayer = AVPlayerLayer(player: player)
        playerLayer?.frame = self.view.bounds
        self.view.layer.addSublayer(playerLayer!)
        player?.play()
    } else {
        print(error?.localizedDescription)
    }

}

下面是我如何初始化用户按下的按钮:

let photoButton:UIButton = {
    let but = UIButton(type: .custom)
    but.layer.cornerRadius = 40
    but.layer.borderColor = UIColor.white.cgColor
    but.layer.borderWidth = 4
    but.clipsToBounds = true
    but.addTarget(self, action: #selector(takeVideo), for: .touchDown)
    but.addTarget(self, action: #selector(stopVideo), for: [.touchUpInside, .touchUpOutside])
    but.translatesAutoresizingMaskIntoConstraints = false
    return but
}()

这是 takeVideo 函数:

@objc func takeVideo() {
    let recordingDelegate:AVCaptureFileOutputRecordingDelegate? = self
    if captureSession?.outputs != nil && videoFileOutput != nil {
        captureSession?.removeOutput(videoFileOutput!)
    }
    videoFileOutput = AVCaptureMovieFileOutput()
    self.captureSession?.addOutput(videoFileOutput!)

    let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
    let filePath = documentsURL.appendingPathComponent("temp")

    // Do recording and save the output to the `filePath`
    videoFileOutput?.startRecording(to: filePath, recordingDelegate: recordingDelegate!)
}

最后，stopVideo 函数:

@objc func stopVideo() {
    videoFileOutput?.stopRecording()
}

我做错了什么？

Answer 1

试试这个:

// playback video
player = AVPlayer(url: outputFileURL)
let playerController = AVPlayerViewController()
playerController.player = player
present(playerController, animated: true) {
    player?.play()
}