First off is it needed to convert 8 channel discrete AAC to 8 channel AC3 to pass this via HDMI to a multichannel home theater decoder? I have Transformers 3 BluRay ripped and I finally tracked down the 8 channel sound track and muxed it into the crappy 6 channel discrete (ok crappy is definitely not fair but 8 channel is such a "mines bigger" thing ). I haven't been able to test it (aside from down mixed version over optical which handles 5.1 for some reason..?..) as my current surround sound system does not have 7.1 surround set up yet but my family is getting a new system soon so if needed I would like to have everything properly encoded to test watch the glory . Second (or third haha) does anyone have any idea on where I can find a software encoder such as Handbrake but for audio (Handbrake doesn't go past 6 channel discrete). I want to be a little bit more crafty with my audio I would die and come back to life if I could find something that could create 6 or 8 channel audio by re-mixing it myself. I'd also like to be able to extract 8 channels from Transformers to get the raw audio file so I can mux it into a lower quality version for a friend who only has the DVD rip but I will hopefully convert him to an audiophile.