[Mp4-tech] Anybody experienced on Sigmadesigns mpeg4 decoder solutions?

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Hi All,
Our company begin project on IP-box, the box should decode media including ISOmpeg4, The Sigmadesigns solution is one of several solution in our sight. Anybody has experience on Sigmadesigns 85XX series?
1: It seems the 85XX series does not support ISO mpeg4 format( for divx is OK) up to now, do u think the solution can decode ISO mpeg4 by develop more driver or microcode?
2: The 84XX series support both Divx & ISO mpeg4, but Audio decoding( Mp3 / AAC )is realized by software, will this method occupy much CPU resource?
Thanks in Advance!
Kang Lei