We use a USB capture device and vMix would best be described as a commercial version of Procaster...it's a software-based video/audio mixer: a been-around for a few years and updated regularly product like the new Livestream Production Switcher software I received a sales-pitch for today. Both the USB device and vMix worked with Procaster when I used it previously. I have not tried using a web-cam by itself because we don't even own one! The webcam I mentioned in my original message is a software web-cam interface that provides special effects. If it's worth noting, all three of those work fine with Webcast and Studio.
We want to use Procaster to get local recording since we can't be consistent results saving on the Livestream end, and we want to have mobile-viewing capability.
LATER EDIT: Since writing the above, I have installed Procaster on my Win7 machine in my office, along with vMix, and an USB capture device. Procaster complains that Adobe Flash is needed for Chat (which is irrelevant to our needs) but it otherwise works: it streams video from both the USB capture device and from vMix (fed video from the USB device). Procaster shows CPU at no higher than 44%.
BUT: Procaster will crash - in its message: <Procaster has stopped working> - after a while...times vary.
Aboonah