You can't create a re-stream unless you record it and then do it with other software, but to use the uStream application, the connection has to be direct. However, you can do it in VLC with the Play and Stream option. Install or open VLC, then go to Media > Open Captured Device. Select all the parameters, then click the arrow next to Play and choose Stream. Paste the stream in a compatible application and that's re-streaming, but I don't think it's available for uStream Producer.