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我正在尝试修改 Google在此处提供的设备上文本识别示例，以使其与实时摄像头馈送一起使用。

当将相机放在文本上时（适用于图像示例），我的控制台在最终耗尽内存之前在流中生成以下内容：

2018-05-16 10:48:22.129901+1200 TextRecognition[32138:5593533] An empty result returned from from GMVDetector for VisionTextDetector.

这是我的视频捕获方法：

func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {

        if let textDetector = self.textDetector {

            let visionImage = VisionImage(buffer: sampleBuffer)
            let metadata = VisionImageMetadata()
            metadata.orientation = .rightTop
            visionImage.metadata = metadata

            textDetector.detect(in: visionImage) { (features, error) in
                guard error == nil, let features = features, !features.isEmpty else {
                    // Error. You should also check the console for error messages.
                    // ... …