AVCaptureVideoDataOutputSampleBufferDelegate 새로운 video frame 객체를 만들때 불린다. (void)captureOutput:(AVCaptureOutput *)output didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection; CMSampleBufferRef -> CVImageBufferRef -> MLRImage - (MLRImage *)convertToMLImage { UIImageOrientation imageOrientation = [self imageOrientationFromSampleBuffer]; CVImageBuffe..