If you really want to stream it through AVR then you need one that supports DLNA video. There are a lot of AVR's that can stream audio and picutres over DLNA, but not so much for video. The reasonable way would be a separate media streamer as mentioned above. Another alternative could be a DLNA capable BluRay player instead of the media streamer. Or you could just connect the NAS over USB directly to your TV if yours supports it (most of TVs from last couple of years do).