Torch/ Lua - Accessing onboard camera using OpenCV 3.1

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX1
4

Hi,

Thanks for your feedback.

Could you try if you can open onboard camera via this sample code?

#include <iostream>
#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/videoio.hpp>

int main(void)
{
    cv::VideoCapture cap("nvcamerasrc ! video/x-raw(memory:NVMM), width=(int)1280, height=(int)720,format=(string)I420, framerate=(fraction)24/1 ! nvvidconv flip-method=2 ! video/x-raw, format=(string)BGRx ! videoconvert ! video/x-raw, format=(string)BGR ! appsink");

    if( !cap.isOpened() )
    {
        std::cout << "Not good, open camera failed" << std::endl;
        return 0;
    }

    cv::Mat frame;
    while(true)
    {
        cap >> frame;
        cv::imshow("Frame", frame);
        cv::waitKey(1);
    }
    return 0;
}

nvcc topic_1005835.cpp -lopencv_core -lopencv_highgui -lopencv_videoio -o test && ./test

Please make sure you have built opencv with gstreamer enabled.
For example,

cmake -D WITH_CUDA=ON -D CUDA_ARCH_BIN="5.3" -D CUDA_ARCH_PTX="" -D WITH_GSTREAMER=ON -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=OFF -D BUILD_EXAMPLES=OFF -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..

Please also check cmake report has gstreamer enabled

--   Video I/O:
......
--     GStreamer:                   
--       base:                      YES (ver 1.8.3)
--       video:                     YES (ver 1.8.3)
--       app:                       YES (ver 1.8.3)
--       riff:                      YES (ver 1.8.3)
--       pbutils:                   YES (ver 1.8.3)

I will try to install torch-opencv and update information to you later.
Thanks.