any video converter multiple audio tracks?

I didn't found any feature related to that on their site (correct me if I am wrong). But I know winx hd video converter (deluxe version) supports hd multi-track videos, it should be a good alternative for you.

I'm pretty sure every video editor/converted simply compresses all audio tracks into one once you save.

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ImTOO DVD Ripper Ultimate

No, it can't afford your needs. Maybe you should try Winx or enolsoft ones.