我的简单代码如下

int main()
{
  CvCapture *capture=cvCaptureFromFile("C:\\vid\\op.mp4");
  if(capture==NULL)
   {
 printf("can't open video");
   }
   Mat frame,first_frame,current_frame;
  char buffer[100];
  int frame_count=1,p=1;
  while(1)
   {
   /*Getting the current frame from the video*/
    frame=cvQueryFrame(capture);
    cv::cvtColor(frame,current_frame,1);   //saving current frame 
    sprintf(buffer,"C:\\frames\\image%u.jpg",p);    
    imwrite(buffer,current_frame);
    p++;

     waitKey(1);
   }
   return 0;
}

有人请帮忙

解决方案：我在读取每个文件之后添加了一个检查,

if(frame.empty()){
    fprinf("cannot access frame");
    return -1;
}