there is a Bug in Resolume 4.1.7. Using USB Vdieo Caputre Devices with the same Chip, you can only use one.
In Resolume there a listed two (Sources), but if put both in the Clip line an activate one ofter the other it always shows the same one.
Using different USB Video Grabber all works fine.
If I open Video lan Player, it hat no Problem to open both Video Direct show devvices.
In Resolume the Direct Show Devices are listed this way:
Grabber
Grabber
Grabber
In VLC it list it that way:
Grabber
Grabber #1
Grabber #2
May be you would fix this in the next version

Thanks