diff --git a/components/rgbd-sources/src/stereovideo.cpp b/components/rgbd-sources/src/stereovideo.cpp
index 389b622e1b46be26ea8b8591faee4ec7c50f0675..6573f74f4d7cf1f3761f98a66c68c6963e10af31 100644
--- a/components/rgbd-sources/src/stereovideo.cpp
+++ b/components/rgbd-sources/src/stereovideo.cpp
@@ -193,7 +193,7 @@ bool StereoVideoSource::retrieve() {
 
 		if (frames_[1].hasChannel(Channel::LeftGray))
 		{
-			frames_[1].download(Channel::LeftGray);
+			//frames_[1].download(Channel::LeftGray);
 			auto &left_gray_prev = frames_[1].get<cv::cuda::GpuMat>(Channel::LeftGray);
 			auto &optflow = frame.create<cv::cuda::GpuMat>(Channel::Flow);
 			nvof_->calc(left_gray, left_gray_prev, optflow, stream2_);