Ios AVDRegister-AppleAVDCheckPlatform（）返回FALSE

我有一个

imagePickerController

，它选择视频，然后通过一个函数分割视频

我的问题是，在我第一次运行它时，它打印出

AVDRegister-AppleAVDCheckPlatform（），返回FALSE

，并且表视图为空，没有错误。但是我第二次运行代码时效果很好 同样的问题还没有得到回答

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

    videoURL = info[UIImagePickerController.InfoKey.mediaURL] as? NSURL
    self.dismiss(animated: true, completion: nil)
    print("VIDEO URL : ", videoURL!)

    // gets duration of video in seconds
    let asset = AVAsset(url: videoURL! as URL)
    let length = Float(asset.duration.value) / Float(asset.duration.timescale)
    print("video length: \(length) seconds")
    lengthOfVid = length
    numOfRows =  Int(ceil(lengthOfVid / Float(duration!)))

    //alert dialog if length of video is > 15 mins i.e 900s
    if length > 900 {
        let alert = UIAlertController(title: NSLocalizedString("alertTitle", comment: "alertTitle"),
                                      message: NSLocalizedString("alertMessage", comment: "alertMessage"),
                                      preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: NSLocalizedString("alertCancel", comment: "alertCancel"), style: .cancel))
        self.present(alert, animated: true, completion: nil)

    } else {
        //run on background thread
        DispatchQueue.global(qos: .userInteractive).async {
            self.trimingVideo(videoURL: self.videoURL!, repititions: self.numOfRows)

        }
    }
}