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I can put hamburger on a fancy plate, cut it with a steak knife, and charge $25 for it --- but it's still not ever going to be a steak. The same can be said for consumer-level 5.1 AC3 audio. I can dump sound into all 6 channels, but that doesn't make it true 5.1 Dolby.
That camera's audio is a perfect example of a consumer gimmick. Given how it was recorded from a teeny tiny on-camera microphone (or cheapie external mic) -- correct me if I'm wrong -- there's no way this is surround sound. It's just mono or stereo crammed into 6 channels. Any good TV receiver does that already -- often better than the computer software or camera processing.
If you really want to go to all that work of preserving the camera's false 5.1, then DVDWS2 will pass it just fine. What I don't know about, however, is Premiere. Standard PCM audio is 2-channel. You can make 6-channel PCM, but I don't do it very often. It's an option in Besweet, for example.
The only time I work with 5.1 is when I'm downconverting it for studio projects, off their master sources, for special projects.
To make 5.1, you need to hand mix it. It takes a lot of skill, and it's not something automatic.
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