AC3 dolby digital is currently being output as a stereo pcm stream on the optical output for devices connected by hdmi.
It works if you play a movie with ac3 sound from usb or stream it over the network from the pc, but if you use a hdmi device like an xbox360
or a standalone player all you get is stereo.
its just plain stupid if you have an xbox360
connected through hdmi and have to also connect the component cable so that you just can use the optical plug on it to connect it to the reciever.
it just contradicts the purpose of hdmi as a multimedia cable.
and even if your reciever has enough digital inputs, it sucks to be switching inputs on the reciever additionally to tv.
Samsung just says its not supported and you should have RTFM
It would be great to get this working, I have seen lots of people on different forums complain about this.