PC>XBOX 360>Integra Receiver>TV -- no digital audio

I installed serviio today and it is playing video well and there is sound. When I am using the Xbox(not serviio) it decodes and dolby digital. When I stream the file it only has analog audio. I have tried a number of different files and get the same results Ideas?

In codec info from VLC it says it is a MPEG AAC Audio(mp4a)