Nvdc errors when running two instances of gstreamer

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

Im receiving the following error when trying to launch two instances of Gstreamer:

NvxBaseWorkerFunction[2575] comp OMX.Nvidia.std.iv_renderer.overlay.yuv420 Error -2147479552
nvdc: open: Too many open files
nvdc: failed to open '/dev/fb0'.
NvxBaseWorkerFunction[2575] comp OMX.Nvidia.std.iv_renderer.overlay.yuv420 Error -2147479552
nvdc: open: Too many open files
nvdc: failed to open '/dev/tegra_dc_1'.
NvxBaseWorkerFunction[2575] comp OMX.Nvidia.std.iv_renderer.overlay.yuv420 Error -2147479552
nvdc: open: Too many open files
nvdc: failed to open '/dev/tegra_dc_1'

The pipeline is very simple:

 std::ostringstream launch_stream;
  launch_stream <<
    "nvarguscamerasrc sensor-id="<<argus_device_idx_offset << 
    " sensor-mode=1 do-timestamp=true wbmode=1 aelock=0 exposuretimerange='11000 6954000'  ee-mode=0 gainrange='1 4' ispdigitalgainrange='1 1' aeantibanding=3 tnr-mode=2 tnr-strength=-0.2 ! "  <<
    "video/x-raw(memory:NVMM),width=" << w << ",height=" << h << ",framerate=" << frame_rate << "/1,format=NV12 ! " <<
    "nvvidconv interpolation-method=4 ! video/x-raw(memory:NVMM), format=NV12, width=960 height=540 ! " <<
    "nvvidconv name=myconv ! " <<
    "video/x-raw(memory:NVMM),format=RGBA ! " <<
    "nvoverlaysink ";

The custom nvvidconv is just getting the frame to perfrom opencv operations:

static GstPadProbeReturn conv_src_pad_buffer_probe(
  GstPad * pad, GstPadProbeInfo * info,
  gpointer u_data)
{
  JUtilsCameraDriver * jcd_ptr = reinterpret_cast<JUtilsCameraDriver *>(u_data);
  GstBuffer * buffer = (GstBuffer *) info->data;
  GstMapInfo map = {0};
  int dmabuf_fd = 0;
  gst_buffer_map(buffer, &map, GST_MAP_READ);
  ExtractFdFromNvBuffer((void *)map.data, &dmabuf_fd);
  //CUDA postprocess
  {
    EGLImageKHR egl_image;
    egl_image = NvEGLImageFromFd(egl_display, dmabuf_fd);
    CUresult status;
    CUeglFrame eglFrame;
    CUgraphicsResource pResource = NULL;
    cudaFree(0);
    status = cuGraphicsEGLRegisterImage(
      &pResource,
      egl_image,
      CU_GRAPHICS_MAP_RESOURCE_FLAGS_NONE);
    if (status != CUDA_SUCCESS) {
      printf("cuGraphicsEGLRegisterImage failed: %d \n", status);
    }
    status = cuGraphicsResourceGetMappedEglFrame(&eglFrame, pResource, 0, 0);
    status = cuCtxSynchronize();
    if (create_filter) {
      filter = cv::cuda::createSobelFilter(CV_8UC4, CV_8UC4, 1, 0, 3, 1, cv::BORDER_DEFAULT);
      //filter = cv::cuda::createGaussianFilter(CV_8UC4, CV_8UC4, cv::Size(31,31), 0, 0, cv::BORDER_DEFAULT);
    }

    cv::cuda::GpuMat d_mat_RGBA(h, w, CV_8UC4, eglFrame.frame.pPitch[0]);     //RGBA

    /* Get BGR */
    cv::cuda::GpuMat d_mat_BGR;
    cv::cuda::cvtColor(d_mat_RGBA, d_mat_BGR, cv::COLOR_RGBA2BGR, 3);
    cv::Mat myImageBGR;
    d_mat_BGR.download(myImageBGR);

    ++frame_num;
    status = cuCtxSynchronize();
    status = cuGraphicsUnregisterResource(pResource);
    NvDestroyEGLImage(egl_display, egl_image);
  }
  gst_buffer_unmap(buffer, &map);

  return GST_PAD_PROBE_OK;
}

If a launch more than one instance of the code, there errors appear and the 2nd instance crashes.
What is this error and what could be causing it?

2

Hi,
Seems like you would like to display multiple windows. For this use-case, please use nv3dsink or nveglglessink.

3

Thanks for the reply!

Im not looking to display the image. The code inside the conv_src_pad_buffer_probe(){...} was taken from an example for getting a frame out of the Gstreamer pipeline into OpenCV Mat for processing.

I commented out the entire function and left a print statement and Im still seeing the same issue of

NvxBaseWorkerFunction[2575] comp OMX.Nvidia.std.iv_renderer.overlay.yuv420 Error -2147479552
nvdc: open: Too many open files
nvdc: failed to open '/dev/fb0'.
NvxBaseWorkerFunction[2575] comp OMX.Nvidia.std.iv_renderer.overlay.yuv420 Error -2147479552
nvdc: open: Too many open files
nvdc: failed to open '/dev/tegra_dc_1'.
NvxBaseWorkerFunction[2575] comp OMX.Nvidia.std.iv_renderer.overlay.yuv420 Error -2147479552
nvdc: open: Too many open files
nvdc: failed to open '/dev/tegra_dc_1'

Does running a second instance failing have to do with egl_display.

Im open to other solution for getting a frame from the pipeline into OpenCV GPU Mat. This method works and is pretty optimized.
I have already been down the road of using OpenCV to create the pipe and fetch the image, but was looking for a more optimal way that would give me more control over the Gstreamer pipeline itself.

Thanks

4

I was able to solve my problem. The issue was I was using nvoverlaysink vs just fakesink in the gstreamer pipeline.

5

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