So I have an audio question that I'm having trouble finding an answer to using google/search function on this forum... I plugged my Apple TV 2 into my receiver using an optical cord for the first time today and am getting no 5.1 sound on files that I encoded using handbrake (DVD rips or converted .mkv files). If I turn off Dolby Digital completely, the stereo tracks play, but once I turn on Dolby Digital on everything is silent. When I encoded using Handbrake, the 5.1 audio is encoded as AC3 passthrough (default for Apple TV preset). Is there a way to fix it so the sound will work on my home theater? And, if I need to re-encode the sound, is there a fast way to do it rather than running everything through Handbrake again?