Opencv Error on Ubuntu Webcam (Logitech C270) Capture -> HIGHGUI ERROR: V4L/V4L2: VIDIOC_S_CROP
capture, opencv, webcam
Solution
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.
Problem
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 and further: Corrupt JPEG data: 2 extraneous bytes before marker 0xd1 Corrupt JPEG data: 1 extraneous bytes before marker 0xd6 Corrupt JPEG data: 1 extraneous bytes before marker 0xd0 Corrupt JPEG data: 1 extraneous bytes before marker 0xd0 I get frames but the values of frame width and height swapped when writing to a Mat object see below: ``` Mat frame; videoCapture = new VideoCapture(camId); if(!videoCapture->isOpened()) throw Exception(); cout << "Frame width: " << videoCapture->get(CV_CAP_PROP_FRAME_WIDTH) << endl; cout << "Frame height: " << videoCapture->get(CV_CAP_PROP_FRAME_HEIGHT) << endl; (*videoCapture) >> frame; cout << "Mat width: " << frame.rows << endl; cout << "Mat height: " << frame.cols << endl; ``` Output: ``` Frame width: 640 Frame height: 480 Mat width: 480 Mat height: 640 ```