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POOpenCV: VideoCapture::get(CV_CAP_PROP_FPS) returns 0 FPS
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  1. POOpenCV: VideoCapture::get(CV_CAP_PROP_FPS) returns 0 FPS
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    copied!<p>I am trying to get the fps from my camera so that I can pass it to the <code>VideoWriter</code> for outputting the video. However, I am getting 0 fps by calling <code>VideoCapture::get(CV_CAP_PROP_FPS)</code> from my camera. If I hardcode it, my video may be too slow or too fast.</p> <pre><code>#include "opencv2/opencv.hpp" #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; using namespace std; using namespace cv; int main(int argc, char *argv[]) { cv::VideoCapture cap; int key = 0; if(argc &gt; 1){ cap.open(string(argv[1])); } else { cap.open(CV_CAP_ANY); } if(!cap.isOpened()) { printf("Error: could not load a camera or video.\n"); } Mat frame; cap &gt;&gt; frame; waitKey(5); namedWindow("video", 1); double fps = cap.get(CV_CAP_PROP_FPS); CvSize size = cvSize((int)cap.get(CV_CAP_PROP_FRAME_WIDTH),(int)cap.get(CV_CAP_PROP_FRAME_HEIGHT)); int codec = CV_FOURCC('M', 'J', 'P', 'G'); if(!codec){ waitKey(0); return 0; } std::cout &lt;&lt; "CODEC: " &lt;&lt; codec &lt;&lt; std::endl; std::cout &lt;&lt; "FPS: " &lt;&lt; fps &lt;&lt; std::endl; VideoWriter v("Hello.avi",-1,fps,size); while(key != 'q'){ cap &gt;&gt; frame; if(!frame.data) { printf("Error: no frame data.\n"); break; } if(frame.empty()){ break; } v &lt;&lt; frame; imshow("video", frame); key = waitKey(5); } return(0); } </code></pre> <p>How can I get <code>VideoCapture::get(CV_CAP_PROP_FPS)</code> to return the right fps or give a fps to the <code>VideoWriter</code> that works universally for all webcams?</p>
 

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