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FPS for USB WEB cam

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Please help me. I'am beginer? :( For this code (win 7) i have only about 6.8 FPS. i need 25. How to сapture at higher FPS. thank you. cap.get(CV_CAP_PROP_FPS)=0 int main() { VideoCapture cap(0); // open the video file for reading if ( !cap.isOpened() ) // if not success, exit program { cout << "Cannot open the video file" << endl; return -1; } double fps = cap.get(CV_CAP_PROP_FPS); //get the frames per seconds of the video if (fps==0) { fps=25; } cout << "Frame per seconds : " << fps << endl; CvSize size = cvSize( cap.get( CV_CAP_PROP_FRAME_WIDTH), cap.get( CV_CAP_PROP_FRAME_HEIGHT)); VideoWriter writer = VideoWriter("cap.avi",CV_FOURCC('M','J','P','G'), fps, size, 1); int cc=0; while(1) { Mat frame; bool bSuccess = cap.read(frame); // read a new frame from video if (!bSuccess) //if not success, break loop { cout << "Cannot read the frame from video file" << endl; break; } writer.write(frame); cc++; if(waitKey(1) == 27) { cout << "esc key is pressed by user" << endl; cout << cc << endl; waitKey(10000) ; break; } } writer.release(); return 0; }

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