Hi,
I'm currently having a hard time to get 5.1 sound from netflix.
Took me a while to figure out, that Netflix uses DD+ (EAC3) and that my old receiver (no HDMI) was not able to get this over SPDIF (toslink).
So I replaced it with an AV receiver (Onkyo SR-508) which supports DD+.

Setup is: MiBox > Receiver > TV
So no pass-through/ARC

I got DD+ working when playing a file with Plex. (afaik Plex does not transcode)
Still in Netflix I only get PCM sound. (no 5.1)

Any idea?