Google DVD43 and ANYDVD
one is free (you get what you pay for) the other is paid but very good.
Use ANYDVD in congunction with Nero Recoder (not free) and you will be very happy. This will work fine with the dlink active tv and is the same setup a buddy of mine has.
i'm using the dsm-510 with nero essentials media server, nero recoder 3, and anydvd.