c++ - Trouble writing video to file using opencv -

i trying write captured video file using opencv in c++ inside visualstudio 2013. programs seems capture video webcam on laptop , able save each frame image when write frames video file, end 6kb file. program gives me no error have followed instruction opencv document.

i pasting program review. please suggest how may make successful program.

thank you.

#include <stdio.h> #include <iostream> #include "opencv2\core\core.hpp" #include "opencv2\highgui\highgui.hpp"  using namespace std; using namespace cv;  int main() {     videocapture video_capture(0);      if (!video_capture.isopened())     {         cout << "error in opening video feed!" << endl;         getchar();         return -1;     }      // creating window view video feed     string window_name = "video_feed";     namedwindow(window_name, cv_window_autosize);      //     mat frame;      // filename     string filename = "...\\first_recording.avi";      // 4 character code     int fcc = cv_fourcc('m', 'p', '4', '2');      // frames per sec     int fps = 10;      // frame size     size frame_size(cv_cap_prop_frame_width, cv_cap_prop_frame_height);      videowriter video_writer = videowriter(filename,fcc,fps,frame_size,true);      if (!video_writer.isopened())// || video_writer.isopened == null)     {         cout << "error in opening video writer feed!" << endl;         getchar();         return -1;     }      int frame_count = 0;      while (frame_count < 100)     {         bool cap_success = video_capture.read(frame);          if (!cap_success)         {             cout << "error in capturing image camera feed!" << endl;             getchar();             break;         }          imshow(window_name, frame);         //imwrite("cap.jpg", frame);         video_writer.write(frame);          switch (waitkey(10))         {         case 27:             return 0;             break;         }         frame_count++;     }      //scvreleasevideowriter;     destroywindow(window_name);     return 0;  } 

please find below piece of code write video file.

 int main(int argc, char* argv[])     {         // load input video         cv::videocapture input_cap("test8.avi");         if (!input_cap.isopened())         {             std::cout << "!!! input video not opened" << std::endl;             return -1;         }      // setup output video     cv::videowriter output_cap("output.avi",                                  input_cap.get(cv_cap_prop_fourcc),                                input_cap.get(cv_cap_prop_fps),                                 cv::size(input_cap.get(cv_cap_prop_frame_width), input_cap.get(cv_cap_prop_frame_height)));      if (!output_cap.isopened())     {         std::cout << "!!! output video not opened" << std::endl;         return -1;     }      // loop read frames input capture , write output capture     cv::mat frame;     while (true)     {                if (!input_cap.read(frame))                          break;          output_cap.write(frame);     }      // release capture interfaces        input_cap.release();     output_cap.release();      return 0; }