C++ RTSP取流报错 怎样基于C++解决RTSP取流报错问题

#include <string>
#include <iostream>
#include <time.h>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/opencv.hpp>
#include <opencv2/core.hpp>
#include <opencv2/videoio/videoio.hpp>
#include <opencv2/imgproc/imgproc_c.h>
//#pragma comment(lib, "")


using namespace std;
using namespace cv;

void Video_to_Image(Mat& frame);

int main()
{
  //string filename = "Wildlife.wmv";
  string filename = "rtsp://admin:abc.1234@10.12.18.131:554";
  Mat frame;
  VideoCapture cap;
  cap.open(filename);
  if (!cap.isOpened()) {
    cerr << "ERROR! Unable to open camera\n";
    return -1;
  }

  //--- GRAB AND WRITE LOOP
  cout << "Start grabbing" << endl
    << "Press any key to terminate" << endl;
  time_t start_time = time(NULL);
  for (;;)
  {
    // wait for a new frame from camera and store it into 'frame'
    cap.read(frame);
    // check if we succeeded
    if (frame.empty()) {
      cerr << "ERROR! blank frame grabbed\n";
      break;
    }
    // show live and wait for a key with timeout long enough to show images
    imshow("Live", frame);

    // 每隔2s保存图片
    time_t end_time = time(NULL);
    if ((end_time - start_time) >=2)
    {
      cout << "2s capture" << endl;
      Video_to_Image(frame);
      start_time = time(NULL);
    }

    if (waitKey(5) >= 0)
      break;
  }
  cap.release();

  return 0;
}

void Video_to_Image(Mat& frame)
{

  char image_name[PATH_MAX];
  sprintf(image_name, "%s%s", "test_image", ".jpg");
  imwrite(image_name, frame);

}