well Dr. divx is the best so far , but if you want a complete studio of the applications use the VIRTUAL DUB its free and its actually a complete movie studio
its not fast as the Dr. divx but the good thing is its free , if you are looking for Dr. DivX its very expensive ! and its very hard to find cracks or serials also for that perticular software
so use Virtual DUB for VCD's and try Easy Divx for DVD's
both are free for life time