Can gstreamer and VideoCapture share the same image data memory?

Autonomous Machines Jetson & Embedded Systems Jetson Nano
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1

Hi
This is the code to open VideoCapture

cv::VideoCapture camera("v4l2src device=/dev/video0 \
                    ! video/x-raw, format=UYVY, width=2592, height=1944, framerate=28/1 \
                    ! nvvidconv ! video/x-raw(memory:NVMM), format=I420 \
                    ! nvvidconv ! video/x-raw, format=GRAY8 ! appsink", cv::CAP_GSTREAMER);

We can get the video frame by

cv::Mat frame;
camera.read(frame);

which will result a time cost due to a memory copy from CPU memory used by gstreamer to frame especial for large size image.

Is there any method to share the frame data memory between VideoCapture read frame and the gstreamer CPU memory?
If yes, is there any sample code available?
Thanks

2

Opencv Mat can be a header only with size and channels, and a pointer to data according to its format.
For NVMM buffers and opencv cuda processing, you may have a look to this example.