I have been working on capture for a long time and I never could get it to be very stable. There is a possibility to license a API that may make it work very well but it is expensive and I would have to charge for such a tool. I'm not even 100% if that would even work well enough so as of right now sadly there are no plans for a capture tool. I really wish I could do it but it just isn't possible right now. There was once a chance to piggy back on the directshow version of the mpeg2 encoder that comes with Liquid. There were two problems however.
1. The encoder as we all know is single threaded which means it just isn't fast enough for realtime HD capture.
2. The encoder only works if you have Liqid installed. While this may be fine for most people it doesn't offer a perfect stand alone solution.
The other encoding API that is open source has no way of feeding through capture hardware and Directshow so I can't use that. That is why the only way to do capture may be to use a commercial encoder which will not be cheap. I will of course keep searching for a solution but after two years of searching I'm afraid it may never happen. I'm sorry.