Welcome to the forum.
I can't really answer your question, since I haven't looked into DLNA streaming much, but a quick look at this device shows that it can accept a video stream over DLNA of certain types.
JRiver MC can supply a DLNA device with a transcoded video stream, so in theory it should certainly work with movies and recorded TV.
Currently, if I recall correctly, MC can't transcode Live TV on the fly, but it is something that has been suggested before on the forums. I'm not sure if it is something the Dev team are thinking about, but there has been a lot of TV development over the past few months. Who knows this may appear at some point.... and when it does, there would be no reason why this device wouldn't see it as a normal DLNA video stream.
SBR