无法播放AVCaptureFileOutput中的视频

Question

我无法播放来自AVCaptureFileOutputDelegate的视频。我想我在这里错过了一些我的代码。

   func recordVideo() {
            let recordingDelegate: AVCaptureFileOutputRecordingDelegate? = self
            self.session!.addOutput(videoFileOutput)
            self.session!.sessionPreset = AVCaptureSessionPresetHigh

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

            videoFileOutput.startRecording(toOutputFileURL: filePath, recordingDelegate: recordingDelegate)
        }

和代表。

func capture(_ captureOutput: AVCaptureFileOutput!, didFinishRecordingToOutputFileAt outputFileURL: URL!, fromConnections connections: [Any]!, error: Error!) {

        if error == nil {
            print("Play: \(outputFileURL!)")
            self.playVideo(path: outputFileURL!)
        } else {
            print(error)
        }
        return
    }

但视频没有播放。我想我错过了文件名或其他东西。请帮忙。谢谢！