I picked up a Mi Box at the local Wal-Mart and hooked it up via HDMI to my Harman Kardon receiver. So far I get perfect DTS and Dolby pass-through in SPMC, but nothing else I have tried gives anything but two channel audio. My audio options are HDMI, SPDIF or Auto (which chooses PCM). Is there something I'm missing here, or do Netflix, Hulu and others just not pass-through Dolby?
I was dealing with this same issue today, I tried every combo possible and I cant get any DTS from my receiver unless I force passthrough with SPMC. I had movie files on a usb drive and using other apps like vlc, I was not able to get it to register as anything other than PCM 2.0. I had one dolby digital movie that passed through correctly, but everything else that was DTS, DTS-HD, or AAC 5.1 would only register as PCM 2.0. My MiBox audio settings detect it as HDMI Passthrough, I also tried manually setting it to HDMI, but I got the same results no matter what. It's got the capability, but the only way I can get it is to force passthrough with SPMC. I hope someone will be able to figure it out.