使用OpenCV检索视频帧-未处理的异常

Question

I am getting video frames using cvQueryframes , but in few videos of avi file I get :

Unhandled exception at 0x715c14f0 0xC0000005: 
    Access violation reading location 0x02f509f0.

I am using visual studio 2010 with OpenCV 2.4.5 and Qt5

CvCapture* cap= cvCaptureFromFile(file);
frame = cvQueryFrame(capture);

Answer 1

There could be multiple reasons for this, link wrong file name, codec not found etc. Try putting debug printf before opening file to see if file name is proper also check for cap if it is not NULL. You can try something like this

int main(int argc, char*argv[])
{

    char *my_file = "C:\\vid_an2\\desp_me.avi";
    std::cout<<"Video File "<<my_file<<std::endl;
    cv::VideoCapture input_video;

    if(input_video.open(my_file))
    {
         std::cout<<"Video file open "<<std::endl;
    }
    else
    {
        std::cout<<"Not able to Video file open "<<std::endl;

    }
    namedWindow("My_Win",1);
    namedWindow("Segemented", 1);
    Mat cap_img;
    for(;;)
    {
         input_video >> cap_img;
         imshow("My_Win", cap_img);
          waitKey(0);
    }
   return 0;
 }