I'm in the process of converting my DVDs to AppleTV Large Format (m4v) in preparation of the new Apple TV. I have a Pioneer receiver that does all the high end audio codecs and running 5.1, which I know DVDs can't utilize, but I want to make sure that I am choosing the correct audio codecs that will still do the best sound that the DVD can support. I don't care about file size. I simply want the best that the movie can do. My question is. Which of these do I need to choose and possibly why? What setting should the DRC be on as well? Source: English (AC3) (5.1 ch) English (AC3) Dolby Surround) English (DTS) (5.1 ch) Audo Codec: AAC (faac) AC3 Passthru Mixdown: Automatic Mono Stereo Dolby Surround Dolby Pro Logic II 6 Channel Discrete Samplerate Audo 48 44.1 32 24 22.05 Bitrate: 32 40 .. .. .. 160 DRC: 0 - 4 Thanks so much!!!!