Docker container GUI ovxio

Robotics & Edge Computing Jetson & Embedded Systems Jetson Xavier NX
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1

Hi,
I made a container where I installed OpenCV and loaded the VisionWorks folder,
I wanted to simply read a image and show it on Display Host using ovxio, here is the code:

#include <iostream>
#include <sstream>
#include <iomanip>
#include <string>
#include <memory>

#include <NVX/nvx.h>
#include <NVX/nvx_timer.hpp>

#include <NVX/Application.hpp>
#include <NVX/ConfigParser.hpp>
#include <OVX/FrameSourceOVX.hpp>
#include <OVX/RenderOVX.hpp>
#include <NVX/SyncTimer.hpp>
#include <OVX/UtilityOVX.hpp>
#include "NVX/nvx_opencv_interop.hpp"

#include <opencv2/core/mat.hpp>
#include <opencv2/imgcodecs.hpp>
#include "opencv2/imgproc.hpp"
#include "opencv2/videoio.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/calib3d.hpp"

static void VX_CALLBACK logCallback(vx_context context, vx_reference ref, vx_status status, const vx_char message[])
{
    printf("[NVX LOG] context=" VX_FMT_REF ",ref=" VX_FMT_REF ",status=%d : %s \n", context, ref, status, message);
    fflush(stdout);
}
	
int main(int argc, char* argv[])
{

    ovxio::ContextGuard context;
    vxDirective(context, VX_DIRECTIVE_ENABLE_PERFORMANCE);
    vxRegisterLogCallback(context, logCallback,vx_false_e);
    std::unique_ptr<ovxio::Render> renderer(ovxio::createDefaultRender(context,"Stereo Matching ", (vx_uint32)2560/2, (vx_uint32)1440));
    if (!renderer)
    {
        std::cerr << "Error: Can't create a renderer" << std::endl;
        return nvxio::Application::APP_EXIT_CODE_NO_RENDER;
    }       

    cv::Mat frame_left = cv::imread("imgLeft.png",cv::IMREAD_COLOR);
    vx_image gray_left = nvx_cv::createVXImageFromCVMat(context, frame_left);
    
while(true){
        renderer->putImage(gray_left);
        renderer->flush();
        
    }
   
}

command launch container:

xhost +si:localuser:root
docker run --network host -it --rm -e DISPLAY=$DISPLAY  -v /tmp/.X11-unix/:/tmp/.X11-unix sa/vision-light:1.0

error:

Error: Can’t create a renderer

by removing the if control the error is:

Segmentation fault (core dumped)

if I use OpenCV with imshow from the container I can get the image on the host
Thanks

3

Hi,

Guess this issue comes from VisionWorks itself rather than docker.
Could you try the app directly on the device to see if the same error occurs?

Error: Can’t create a renderer

Thanks.

4

trying the same code on the device works.

Perhaps when loading the libraries on the container something is missing for VisionWorks? When I compile the project it does not give me link errors.

5

what if to use the docker --privileged
argument? that is less secure though thus not adviseable for frequent use, unless specifically required

6

just launch the container with the parameter --privileged?

sudo docker run --privileged [image_name]

EDIT
no it does not work the same with --privileged

7

Hi,

After internal checking, this is a known issue but does not have a solution or workaround yet.

We already pass your problem to our internal team again.
Will let you know once we got any feedback.

Thanks.

9

Fine, I look forward to an update from you.
Thank you
Salvatore