HIGHGUI error while using opencv to stream video from eye toy webcam

Question

I am a beginner to use OpenCV right now. I am trying to stream video from a webcam (eye toy webcam) using OpenCV libraries. I know that the webcam is working fine because I used VLC to stream video and it was working fine. I have the following program:

int main(){
    VideoCapture cap(0); // open the video camera no. 0

    if (!cap.isOpened())  // if not success, exit program
    {
        cout << "Cannot open the video file" << endl;
        return -1;
    }

    double dWidth = cap.get(CV_CAP_PROP_FRAME_WIDTH); //get the width of frames of the video
    double dHeight = cap.get(CV_CAP_PROP_FRAME_HEIGHT); //get the height of frames of the video

    cout << "Frame size : " << dWidth << " x " << dHeight << endl;

    namedWindow("MyVideo",CV_WINDOW_AUTOSIZE); //create a window called "MyVideo"

    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 a frame from video file" << endl;
             break;
        }

        imshow("MyVideo", frame); //show the frame in "MyVideo" window

        if (waitKey(30) == 27) //wait for 'esc' key press for 30ms. If 'esc' key is pressed, break loop
       {
            cout << "esc key is pressed by user" << endl;
            break; 
       }
    }
    return 0;
}

When I run this I get the following output:

HIGHGUI ERROR: V4L/V4L2: VIDIOC_CROPCAP
Frame size: 640x480
select timeout

I am sure that the the error is thrown when the device is being attached using VideoCapture. I have searched a lot on the net but could not find explanation for this specific error.

Any help will be appreciated.

Your code runs fine on my machine. Are you sure you have configured your openCV library properly. — Sohaib, Oct 05 '13 at 18:56
http://stackoverflow.com/questions/16287488/runtime-opencv-highgui-error-highgui-error-v4l-v4l2-vidioc-s-crop-opencv-c — Sohaib, Oct 05 '13 at 18:59
open a terminal type gstreamer-properties click enter click video try v4l1 and v4l2 click the bottom test buton for each 1 and do not open cheese Source: http://ubuntuforums.org/showthread.php?t=1455700 — Sohaib, Oct 05 '13 at 19:06
Thanks a lot for your reply Sohaib. I ran gstreamer-properties and it seemed to do something with the webcam (I could again see the activity LED glowing), but there was no video stream. Is that supposed to happen. I am now inclining towards re configuring the OpenCV libraries. Will let you know how that works out. — Kartik, Oct 06 '13 at 17:45

score 2 · Answer 1 · answered Jul 22 '15 at 19:41

2

I fixed this by installing: libv4l-dev then recompiling opencv. Check your cmake output to make sure that V4L is actually being linked in properly.

answered Jul 22 '15 at 19:41

TheBat

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score 0 · Answer 2 · edited May 23 '17 at 12:16

0

Please have a look at the following links:

1. Stackoverflow

2. Ubuntu Forums

The problem could be with your webcam.

edited May 23 '17 at 12:16

Community

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answered Oct 06 '13 at 17:59

Sohaib

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score 0 · Answer 3 · answered Jul 17 '15 at 19:23

0

I haved the some error when trying to execute a code that does facedetection , i solved it by adding the files needed in my working folder (source folder). you can show us the entire code to find out what exactly you need .

answered Jul 17 '15 at 19:23

The Beast

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HIGHGUI error while using opencv to stream video from eye toy webcam

3 Answers3