How to configure video input?

[SourceChild]

What was the final solution?

[Leif]

What was the final solution?

It appears to have been a driver issue but I'm not completely sure.
The device finally showed up in Catalyst after we installed a new driver, so that was probably the issue.
It's very strange, however, that the test apps I used were able to find that source without a driver update. I would've guessed it to be an all-or-nothing situation, but apparently some apps could find it with the older driver, while Catalyst required a newer one.