Stereo input only. Not very much to record in DD from DirecTV - TIVO captures DD 5.1 and will output regular L/R stereo or the recorded DD 5.1 through optical for playback - no digital audio recording input on this DVD recorder. Not trying to copy DVD's, if I want a full DD 5.1 DVD I'll buy it. Given the life span of recording disks its not worth the trouble trying to generate home made copies. I'll take a stereo sound track ( PLII ! )that might last a few years for my cost of $5. I'll be able to buy a replacement of it as a new DD 5.1 from the oldy moldy selection at walmart for $5 by then. I have been collecting movies for years - about 600 titles, through paying $20 for new relases. It's time to go HDTV !!