In QT5 qtmultimedia, directshow plugin can't open two same camera. It's always open first camera.

In Function: DSCameraSession::setDevice(const QString &device):
use "FriendlyName" not correct. two or more same camera, the first camera always opened.

the "FriendlyName" is usually as display to user, maybe add deviceUniqueId to identify device, eg "DevicePath".