Need some help here. I thought that using the optical output from the Apple TV into a reciever that can decode DTS would work. However none of my encodes work. I have a few that I set to AC3 and they work fine however any file that I am trying to stream from my PC will not work if it only has a DTS audio channel. Most of these were original mkv formats that I converted to mp4. Now that most of them are in mp4 format if i try to re-encode the file using Media Recode to get the audio into AC3, after conversion itunes will not add the file. No matter what i try iTunes will not add that file. Any suggestions or help?