Roku Ultra 4800x w/Blackbird hdmi audio extractor. New 4K tv, receiver only has 1.3 hdmi ports, using Blackbird hdmi audio extractor to route digital audio thru optical to receiver. No sound thru optical, tried another Roku, same result. Attached dvd player to hdmi input on Blackbird, audio works thru optical to receiver. Seems hdmi signal not standard? Passthru hdmi in Blackbird works fine at receiver and tv for audio.