How to get USB camera to be default

[rtvideo]

Hello, I am working on an embedded board and inside the board it has a /dev/video0 and a /dev/video1 by default. I then plug in my USB camera and it usually is /dev/video2. My current code is taking the deafult camera and (which I want to be the USB camera) thinking it is the /dev/video0.

My code:

int find_device(){
    QString device_name;
    std::string defaultDevice;
    const QList<QCameraInfo> availableCameras = QCameraInfo::availableCameras();
    for (const QCameraInfo &cameraInfo : availableCameras) {
        if (cameraInfo == QCameraInfo::defaultCamera()){
               device_name = QCameraInfo::defaultCamera().deviceName();
               defaultDevice = device_name.toStdString();
        }
    }

Does anyone know how I would edit this to make the USB camera the one it defaults to or how it could find it? I dont think QCamerainfo::devicename will work for me because there are multiple USB cameras I plug in that have different names.

[SGaist]

Hi,

That is something that you have to setup on your system. If using udev for example, write a rule that gives a meaningful name to that camera and use that in your software.