Hello,
I'm trying read the video from a camera connected to my computer using OpenCV.
I tried this first test, and I got the following error message :
"GStreamer Plugin: Embedded video playback halted; module v4l2src0 reported: Cannot identify device '/dev/video0'.
OpenCV Error: Unspecified error (GStreamer: unable to start pipeline
) in cvCaptureFromCAM_GStreamer, file 'file_location'/opencv-3.1.0/modules/videoio/src/cap_gstreamer.cpp, line 818
terminate called after throwing an instance of 'cv::Exception'
what(): 'file_location'/opencv-3.1.0/modules/videoio/src/cap_gstreamer.cpp:818: error: (-2) GStreamer: unable to start pipeline
in function cvCaptureFromCAM_GStreamer
Aborted"
Here is the code :
#include "opencv2/opencv.hpp"
#include
using namespace cv;
int main(int, char**)
{
VideoCapture cap(0); // open the default camera
if(!cap.isOpened()) // check if we succeeded
{
std::cout << " Cannot open video" << std::endl;
return -1;
}
Mat edges;
namedWindow("edges",1);
for(;;)
{
Mat frame;
cap >> frame; // get a new frame from camera
cvtColor(frame, edges, COLOR_BGR2GRAY);
GaussianBlur(edges, edges, Size(7,7), 1.5, 1.5);
Canny(edges, edges, 0, 30, 3);
imshow("edges", edges);
if(waitKey(30) >= 0) break;
}
// the camera will be deinitialized automatically in VideoCapture destructorcd ,,
return 0;
}
If someone has an idea that would be very helpful !
Thank you very much in advance.
Florence
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