We currently only have plans to support a single virtual camera output of the main output at this time.
I still use the 25.0.8. I use 6 camera: 3 USBs and 3 NDI. Never had issues of stability. I'm afraid it depends by the architecture.My set up involves 2 NDI HX PTZs, one BirdDog encoder, and two iPhones. This is the first version of OBS that's been able to keep all 5 cameras steady and in relative sync. Awesome.
The Virtual Cam Plugin doesn't have audio either, hopefully it changes in the future, by the way you can use both the plugin and the default virtual cam, giving you 5 virtual cameras.The cynic in me would think this was deliberate to make you buy the full version of Teams, Skype etc rather than let you use OBS. However in my case the new virtual camera works with zoom but Skype only works with OBS-Camera, not this new version in 26. This is a mute point as there is currently no audio associated with the new virtual camera which rules it out anyway unless you are a practising mime. I am sure it will be providing audio soon. In the meanwhile the excellent plugin still delivers.
Hmm - so where is my virtual source "OBS-Audio" coming from? I assumed it was the virtual camera plugin. When I stop the plugin it disappears. Very strange. I will investigate how something that does not exist appears to exist.The Virtual Cam Plugin doesn't have audio either, hopefully it changes in the future, by the way you can use both the plugin and the default virtual cam, giving you 5 virtual cameras.