> Codecs are not a factor; its the main program's ability to multi-thread that make the difference.
Is that right? Consider benchmarks here:http://www.tomshardware.com/reviews/multi-core-cpu,2280-7.html
The TMPGEnc benchmarks show a noticeable multi-core improvement when encoding DivX but not Xvid. And in the (Tom's) reviews it's not uncommon to find sentences like: "...the DivX codec results show a notable nod to threading, while the Xvid codec does not."
It's evidence like this that makes me think there's more to it than just the main program's ability to multi-thread.
Also, if it's just a matter of the app being multi-threaded, are there audio encoders out there that benefit from multiple cores?