Accessing Multiple stream bufSurface

AI & Data Science Deep Learning (Training & Inference)
1

Hi, I am trying to access the surface list of NvBufSurface. I am only able to access the first element in the surfaceList. When I try to read surfaceList[1] elements it returns null.

Following is my code:

surface = (NvBufSurface *) in_map_info.data;  
    g_print("\nNumFilled: %d\n",surface->numFilled);
    g_print("\nSurface1 height: %d\n",surface->surfaceList[1].height);
    if(surface->surfaceList[1].mappedAddr.addr[0]!=NULL){
        g_print("\nWhy don't you write?\n");
    }else{
        g_print("\nIt won't write!\n");
    }

I get the following output:

In cb_newpad
In cb_newpad
In cb_newpad
In cb_newpad
Creating LL OSD context new

NumFilled: 2

Surface1 height: 1080

It won't write!
OpenCV Error: Assertion failed (total() == 0 || data != __null) in Mat, file /u$
terminate called after throwing an instance of 'cv::Exception'
  what():  /usr/include/opencv2/core/mat.inl.hpp:500: error: (-215) total() == $