ios - 如何从 UIImagePickerController 获取 1080p 视频？

Question

当我使用 UIImagePickerController 导入 1080p 视频时，询问它的大小是多少，它报告说只有 720p。

这是我打开图像选择器的方式:

    let picker = UIImagePickerController()
    picker.sourceType = .PhotoLibrary
    picker.videoQuality = .TypeHigh
    picker.allowsEditing = false
    picker.delegate = self
    picker.modalPresentationStyle = .Popover
    picker.popoverPresentationController?.sourceView = self.view
    picker.popoverPresentationController?.sourceRect = self.findButton.frame
    picker.mediaTypes = [kUTTypeMovie as String]
    self.navigationController?.presentViewController(picker, animated: true, completion: nil)

然后，当用户选择图片时:

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

    let readMovieURL = info[UIImagePickerControllerMediaURL]
    // ...
}

稍后我要求大小:(这个位在 Objective-c 中)

NSDictionary *options = @{AVURLAssetPreferPreciseDurationAndTimingKey:@YES};
AVURLAsset *readMovieAsset = [[AVURLAsset alloc] initWithURL:readMovieURL options:options];

AVAssetTrack * track = [[asset tracksWithMediaType:AVMediaTypeVideo] firstObject];

// Why is it 720p?
CGSize size = track.naturalSize;

如何让用户从他们的库中选择一个 1080p 视频，然后以全分辨率使用它？

Answer 1

问题是使用 UIImagePickerControllerMediaURL。那特指处理过的(压缩过的)视频。切换到以下内容可获得完整的 1080p 视频:

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

    // Reference URL instead
    let readMovieURL = info[UIImagePickerControllerReferenceURL]
}

我不知道如何防止选择器首先经历压缩过程。