UIVideoEditorController忽略.videoQuality

Question

尽管在iOS 8.2和iOS 8.3中设置了UIVideoEditorController属性，但videoQuality剪裁的视频会被压缩并失去质量。

let controller = segue.destinationViewController as! UIVideoEditorController
    if let pathStr = mediaFile.pathStr {
        if UIVideoEditorController.canEditVideoAtPath(pathStr as String) {
            controller.delegate = self
            controller.videoMaximumDuration = 30
            controller.videoPath = pathStr as String
            controller.videoQuality = .TypeHigh
        } else {
            showAlert("Can not edit video")
        }
    }
}