I've followed AE&ErMaC's guide but I guess this isn't supposed to happen since I didn't find anything, FAQ or such, about bugs in XviD (though I heard it's quite a "young" codec).
I'm using the XviD-04102002-1 alpha release, if this could help... I can't really try another version, it's the only one I've found (A&E's guide's link is broken).
