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                    VideoCapture video("Video.mp4");
        int video_length;

        video_length = video.get(CV_CAP_PROP_FRAME_COUNT);
        cout<< "FRAME COUNT = "<< video_length <<endl;

                    VideoCapture video("Video.mp4");
        int video_length;

        video_length = video.get(CV_CAP_PROP_FRAME_COUNT);
        cout<< "FRAME COUNT = "<< video_length <<endl;

in opencv cpp by using cap.get(CV_CAP_PROP_FRAME_COUNT); i get the count 34 which is too small because my camera fps is 30 and i am recording video for 10 second so expected frame count is nearly equal to 300

 VideoCapture video("Video.mp4");
 int video_length;

 video_length = video.get(CV_CAP_PROP_FRAME_COUNT);
        video.get(CV_CAP_PROP_FRAME_COUNT); 
cout<< "FRAME COUNT = "<< video_length <<endl;