USB over Network camera is not working

[aliemrenebiler]

We designed an interface with three camera views, it detects cameras via QML files:

import QtQuick 2.0
import QtMultimedia 5.9

Item {
    Rectangle {
        anchors.fill: parent
        width: parent.width
        height: parent.height
        color: 'black'
    }

    Camera {
        id: camera
        // kamera seçimi yap
        deviceId: QtMultimedia.availableCameras[1].deviceId
    }

    VideoOutput {
        source: camera
        anchors.fill: parent
        focus : visible // to receive focus and capture key events when visible
    }
}

We also use USB over Network app to connect other devices cameras, but Qt has a problem with it.
It detects the network camera but won't show it. It just shows a black screen. Normally the app connects perfectly, we can use the network camera with other camera apps. How can we solve this? Why we can't get the data from network cameras.