Hi and welcome to devnet, Qt uses native system call for that task so it returns whatever Windows wants to communicate about the hardware. However listing and accessing are likely two different independent aspects.

Hi, Are you running them from Qt Creator ? If not did you deploy the QtMultimedia plugins for your second application ?

@SGaist Ok I've put the environment variable you suggested in my Build Environment list. The application spat some output in which everything looks OK until this line: defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.camera" which looks like something that's querying the D-Bus for some services. I've checked every check box when I was installing Qt using the installer but It looks like it didn't install this or something else is needed but it's not documented.

Those plugins can be tricky… Happy coding !