Is there a difference between Audigy 2 hardware decoding and DVD/MPEG-2 software decodi

I have a capture card and run my PC as a part time HTPC. The audio and video is analog captured and MPEG-2 encoded by the card.
I have the Nvidia DVD/MPEG-2 decoder set to SPDIF(reciever) so it sends the audio stream directly to the Audigy 2.
When playing any of these recorded shows, the only way I get any surround sound on my 5. speakers is to have CMSS () turned on, and it's ok (but not as good as true DVD quality 5.).
What I am wondering, would there be any difference if I upgraded the Nvidia codec to the platinum version, which does software 5. decoding? Would it do a better job of decoding any Dolby Surround material?

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