Version 2 of our software is based around the Video4Linux 2 API, along with features that we added into the V4L API. With that in mind, currently we do not support any other software compression capture card.
Technical note: We specifically wrote the drivers for the V4L API to make use of hardware compression MPEG-4 and H.264 streaming. We also use these card's built-in motion detection technology which greatly reduces the system resources. It is in the roadmap to add support for software compression cards, but no date is set for this option.