Gstreamer not opening camera in OpenCV

Robotics & Edge Computing Jetson & Embedded Systems Jetson TK1
1

System info:

  • Tegra K1
  • Ubuntu 16.04 - Linux for Tegra
  • OpenCV 3.1.0 built from source with Gstreamer support -DWITH_GSTREAMER=ON \ -DWITH_GSTREAMER_0_10=ON
  • Camera is OV5640 connected to the board via CSI

    • Code to replicate problem

    //Various Pipelines I have tried//
//const std::string gst_pipeline = "v4l2src ! queue ! 'video/x-raw-yuv,format=(fourcc)Y444,width=1920,height=1080,framerate=25/1' ! queue ! appsink";
const std::string gst_pipeline = "v4l2src ! videoconvert ! appsink";
cv::VideoCapture cap(gst_pipeline, cv::CAP_GSTREAMER);
if (!cap.isOpened()){
	printf("Camera not opened \n");
	return -1;
}
    // View video
cv::Mat frame;
 for(int i = 0; i < 1500; i++) {
       cap >> frame;  // Get a new frame from camera
}

    Doing this I get

    Camera not opened

    printed to the terminal.

    If I try to use the default camera, i.e.

    cv::VideoCapture cap(0);

    the camera opens but the output is not anything I can use. rhs is the output from using the default camera. https://drive.google.com/file/d/1D7OxTj2UecsbtiihJPzMdOkJBEjdsvwk/view?usp=sharing
    This image is not a bayer image, it is a 3-channel image and none of the colorspace conversions help.

    My Questions

  • Any advice on opening the camera and getting useable image data from it? Ideally with Gstreamer so I can control the resolution and the colorspace
  • Should I try to rebuild OpenCV with V4L flag turned on?