DirectShow Virtual Camera does not appear in the list on some configurations

Question

I\'m using DirectShow filter as virtual camera (CLSID_VideoInputDeviceCategory). It\'s working good but some apps/configurations do not display this feed as source. For example

Answer 1

DirectShow virtual cameras are only visible to same bitness applications, which consume video capture using DirectShow (or, in some cases, Video for Windows). If you have a bitness problem, you can fix it by building/registering virtual camera for respective bitness. If the application consumes video using Media Foundation, the virtual DirectShow camera won't bee seen/accessible. Applicability of Virtual DirectShow Sources blog post explains this a bit further and with a picture.

Firefox is supposedly using DirectShow, so it might be a bitness problem.

Another problem might be related to Windows 10 Anniversary Update, which changed behavior of DirectShow sources. You might want to apply a registry fix mentioned here to see if it restores the earlier behavior (to find out whether the experienced issue is related to Anniversary Update changes).