Opencv Error on Ubuntu Webcam (Logitech C270) Capture -> HIGHGUI ERROR: V4L/V4L2: VIDIOC_S_CROP

Question

this erorr message appears on running simple camera capture on Ubuntu with logitech C270 (OpenCV 2.4.2/C++):

HIGHGUI ERROR: V4L/V4L2: VIDIOC_S_CROP

Answer 1

The width of an image is given by its number of columns. Your code should be

cout << "Mat width: " << frame.cols << endl;
cout << "Mat height: " << frame.rows << endl;

So there is no swap between width and height.