I have brand new Sony DVD Player (model DVP-NC875V) with the audio plugged into a new Denon AVR-1905 receiver with an optical cable. It plays sound fine, but I cant get it to play in Dolby Digital or DTS (The movies are Dolby or DTS). I have my hdtv cable plugged into the Denon also via a different optical cable and it plays Dolby Digital just fine. I have switched the cables around to make sure it wasn't that and no change.

Does anyone have any advice?

Thanks a lot.
Bryan