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Tell me how those different channels look like.

int main (int argc, char **argv)
{
   if (argc !=2)
   { 
   std::cout << "USE: " << argv[0] << " <video-filename>" << std::endl;
    return -1;
   }

  //Open the video that you pass from the command line
  cv::VideoCapture cap(argv[1]);
  if (!cap.isOpened())
  {
   std::cerr << "ERROR: Could not open video " << argv[1] << std::endl;
   return -1;
  }

  int frame_count = 0;
  bool should_stop = false;

  while(!should_stop)
  {
     cv::Mat frame;
     cap >> frame; //get a new frame from the video
     if (frame.empty())
     {
        should_stop = true; //we arrived to the end of the video
        continue;
     }

     vector<Mat> matVector;
     split( frame, matVector );

      char filename[64];
      char filename2[64];
      char filename3[64];
      sprintf(filename, "frame_%06d_b.jpg", frame_count);
      sprintf(filename2, "frame_%06d_g.jpg", frame_count);
      sprintf(filename3, "frame_%06d_r.jpg", frame_count);

      cv::imwrite(filename, matVector[0]);
      cv::imwrite(filename2, matVector[1]);
      cv::imwrite(filename3, matVector[2]);
      frame_count++;
 }

 return 0;
}

Tell me how those different channels look like.

int main (int argc, char **argv)
{
   if (argc !=2)
   { 
   std::cout << "USE: " << argv[0] << " <video-filename>" << std::endl;
    return -1;
   }

  //Open the video that you pass from the command line
  cv::VideoCapture cap(argv[1]);
  if (!cap.isOpened())
  {
   std::cerr << "ERROR: Could not open video " << argv[1] << std::endl;
   return -1;
  }

  int frame_count = 0;
  bool should_stop = false;

  while(!should_stop)
  {
     cv::Mat frame;
     cap >> frame; //get a new frame from the video
     if (frame.empty())
     {
        should_stop = true; //we arrived to the end of the video
        continue;
     }

     vector<Mat> vector<cv::Mat> matVector;
     split( cv::split( frame, matVector );

      char filename[64];
      char filename2[64];
      char filename3[64];
      sprintf(filename, "frame_%06d_b.jpg", frame_count);
      sprintf(filename2, "frame_%06d_g.jpg", frame_count);
      sprintf(filename3, "frame_%06d_r.jpg", frame_count);

      cv::imwrite(filename, matVector[0]);
      cv::imwrite(filename2, matVector[1]);
      cv::imwrite(filename3, matVector[2]);
      frame_count++;
 }

 return 0;
}

Tell me how those different channels look like.

int main (int argc, char **argv)
{
   if (argc !=2)
   { 
   std::cout << "USE: " << argv[0] << " <video-filename>" << std::endl;
    return -1;
   }

  //Open the video that you pass from the command line
  cv::VideoCapture cap(argv[1]);
  if (!cap.isOpened())
  {
   std::cerr << "ERROR: Could not open video " << argv[1] << std::endl;
   return -1;
  }

  int frame_count = 0;
  bool should_stop = false;

  while(!should_stop)
  {
     cv::Mat frame;
     cap >> frame; //get a new frame from the video
     if (frame.empty())
     (cap.grab() {
        cap.retrieve(frame, 1);

        char filename[64];            
        sprintf(filename, "frame_%06d.jpg", frame_count);           

        cv::imwrite(filename, frame);

        frame_count++;
      } else {
        should_stop = true; //we arrived to the end of the video
true;
        continue;
     }

     vector<cv::Mat> matVector;
     cv::split( frame, matVector );

      char filename[64];
      char filename2[64];
      char filename3[64];
      sprintf(filename, "frame_%06d_b.jpg", frame_count);
      sprintf(filename2, "frame_%06d_g.jpg", frame_count);
      sprintf(filename3, "frame_%06d_r.jpg", frame_count);

      cv::imwrite(filename, matVector[0]);
      cv::imwrite(filename2, matVector[1]);
      cv::imwrite(filename3, matVector[2]);
      frame_count++;
 }
 }

 return 0;
}

int main (int argc, char **argv)
{
   if (argc !=2)
   { 
   std::cout << "USE: " << argv[0] << " <video-filename>" << std::endl;
    return -1;
   }

  //Open the video that you pass from the command line
  cv::VideoCapture cap(argv[1]);
  if (!cap.isOpened())
  {
   std::cerr << "ERROR: Could not open video " << argv[1] << std::endl;
   return -1;
  }

  int frame_count = 0;
  bool should_stop = false;

  while(!should_stop)
  {
     cv::Mat frame;
     if (cap.grab() {
        cap.retrieve(frame, 1);

        char filename[64];            
        sprintf(filename, "frame_%06d.jpg", frame_count);           

        cv::imwrite(filename, frame);

        frame_count++;
      } else {
        should_stop = true;
        continue;
      }
 }

 return 0;
}