I guess thats because when I override the audio output to DD5.1 for my Denon receiver using optical output, the HDMI also outputs in that same format and the TV can't process it in that format? Some other HDTVs apparently can decode DD or DTS, since my other HDTV (a Samsung) in Roku audio auto mode detects "DD5.1/DTS" for that TV without any receiver, just the TV. I also notice that the HDMI audio output to my 2012 Panasonic plasma HDTV from the Roku Ultra only is audible thru the TV if PCM stereo audio mode is selected, thats also what is selected if "auto" is used since stereo is detected from the TV.
The audio was present from the TV speakers quieter as would be expected with AC3 vs PCM, but no drop-outs. I confirmed that it was 5.1 program (the optical is still connected to my receiver, so the display confirmed 5.1). Also works for youtube videos that have DD5.1 or DD+, as well as video files on a USB flashdrive with DD5.1 or DTS audio tracks. I set my HDMI audio to AC3, re-enabled the in-built speakers on my TV and then selected an HD movie channel. My older Denon receiver doesn't support DD+ so the 4640 apparently is as expected converting DD+ to DD5.1 on the optical audio output OK. Unfortunately at this time, we are unable to guaranteed USB Voice Chat compatibility. as they downmix the audio to a 2 channel stereo track for output. A few options you have as backup is you can use the optical output on your TV if it does have the ability to passthrough Dolby Digital from the HDMI ports or you can purchase an HDMI audio extractor with an optical output to add one on to your console. This is working for me with Netflix, Amazon prime video and VUDU both for DD5.1 or DD5.1+ title. The reason for this is that while many TVs will accept a Dolby 5.1 channel encoded as. I manually select DD5.1 or DD5.1/DTS for the optical/HDMI audio output format in the Roku's settings. I can confirm that with my new Roku Ultra 4640 connected via optical cable to my older Denon receiver I get DD5.1 with the latest current v9.0 firmware release.
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