Large-scale, real-time multimedia distribution over the Internet has been the subject of research for a substantial amount of time. A large number of mechanisms, policies, methods and schemes have been proposed for media coding, scheduling and distribution. IP multicast was expected to be the primary transport mechanism for this, though it was never deployed to the expected extent. Recent developments in overlay networks has reactualized the research on multicast, with the consequence that many of the previous mechanisms and schemes are being re-evaluated. One of the most important multicast services is real-time media streaming. This extended abstract discusses ongoing research on adapting a popular overlay distribution system, BitTorrent, to provide a streaming service with soft QoS guarantees.