How to connect ip address cameras

[hupo376787]

Hi
How to connect ip address cameras？

And also, opencvsharp seems can not get the camera's name?

If it does, please tell me, thanks

[shimat]

It's very likely that you can connect ip cameras by using VideoCapture(string)

VideoCapture("http://192.168.0.1/foo/bar.mjpeg")

[hupo376787]

Thanks，And if i want the camera's name, not use "Camera 1", how to do it?

[turowicz]

@shimat I'm having an issue with a HoneyWell IP camera. It works in Python but not in OpenCvSharp:

var networkAddress = "rtsp://admin:1234@192.168.1.109:554/cam/realmonitor?channel=1&subtype=0";
var capture = new VideoCapture(networkAddress);

I get the following error and capture is null:

OpenCV: Couldn't read video stream from file "rtsp://admin:1234@192.168.1.109:554/cam/realmonitor?channel=1&subtype=0"

[turowicz]

Full python example that works no problems:

import cv2


def show_webcam(mirror=False):
    cam = cv2.VideoCapture("rtsp://admin:1234@192.168.1.109:554/cam/realmonitor?channel=1&subtype=0")
    while True:
        ret_val, img = cam.read()
        if mirror: 
            img = cv2.flip(img, 1)
        cv2.imshow('my webcam', img)
        if cv2.waitKey(1) == 27: 
            break  # esc to quit
    cv2.destroyAllWindows()


def main():
    show_webcam(mirror=True)


if __name__ == '__main__':
    main()

[shimat]

Probably this is because the OpenCvSharp's native wrapper (OpenCvSharpExtern.dll) is not built with gstreamer feature.

[turowicz]

@shimat can you tell me how can I build it so it does have that?

[turowicz]

@shimat, also the person above seems to be able to do it?
cc @hupo376787

[turowicz]

@shimat this person also seems to be able to do it:
#480
cc @vakym

[vakym]

@shimat
This worked by default for me. I installed the library from the nuget package.

[turowicz]

I'm about to test this on Windows. I'm developing on Mac, and I did have to compile the Extern myself, so maybe I did something wrong there (lib source: #515 (comment))

[turowicz]

Yep, works on Windows. @shimat can you tell me how can I build the libraries again in order to have them working on OSX and Linux.

[shimat]

I'm sorry, I may have misunderstood about rtsp. Could you show me the result of Cv2.GetBuildInformation() ? Your video backend libraries may be disabled.

Video I/O:
  DC1394 1.x:                  NO
  DC1394 2.x:                  NO
  FFMPEG:                      NO
     avcodec:                   NO
     avformat:                  NO
     avutil:                    NO
     swscale:                   NO
     avresample:                NO
  GStreamer:                   NO

[turowicz]

Hey @shimat, I was away for a few days. I will be back on Monday and will reply.