It can has audio in AC3 format, and we haven't decoder for it.
It can be encoded in profile higher than decoder supports(simple for MPEG4 ASP, and baseline for AVC).
It can be encoded with unsupported DivX/XviD features, like Bvop, QPel, GMC... Don't know what of this are supported.
But that support are same as in phones with correct stagefright-enabled official Gingerbread. So, its maximum what we can get from our QDSP
Yes, WMV are still not play. Don't know why. More work needed to understand what we missing for init it.
Where I take it? See that thread, this user are help me with it