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I think problem in waitKey(0). AsI have the same issue. Don't use waitKey(0), use waitKey(1); Yes, FPS will little slow but no problem with Keys.

I think problem in waitKey(0). AsI As I have the same issue. Don't use waitKey(0), use waitKey(1); Yes, FPS will little slow but no problem with Keys.

I think problem in waitKey(0). As I have the same issue. Don't use waitKey(0), use waitKey(1); Yes, FPS will little slow but no problem with Keys.Keys. If it don't work please, use destroyWindow after all functions which assosiated with waitKey(0). Or use namedWindow("Frame",WINDOW_AUTOSIZE) before imshow;

I think problem in waitKey(0). As I have the same issue. Don't use waitKey(0), use waitKey(1); Yes, FPS will little slow but no problem with Keys. If it don't work please, use destroyWindow after all functions which assosiated with waitKey(0). Or use namedWindow("Frame",WINDOW_AUTOSIZE) before imshow;imshow; And why you are doing poliphormism. As you convert waitKey() value to Char, then to the Integer and then in if you using char->to int and then == 27) Why? Use waitKey as int and dont convert to char as you don't need in: Use this code:

int main()
{
 cv::VideoCapture cap(1);
 cv::Mat frame;

if (!cap.isOpened())
 {
    std::cout << "Error opening video capture." << std::endl;
    return -1;
  }

 while (1) {
cap >> frame;

if (frame.empty())
    break;

cv::imshow("Frame", frame);

int c = cv::waitKey(0);
std::cout << (c << std::endl;
if (c == 27) 
    break;
 }

 cap.release();
 cv::destroyAllWindows();
return 0;
        }