> and dividing region0/1/2 is determined by looking up the subdv_table[].
> However, I am afraid this method is not the best.

It is indeed not best.

> 
> Does the MP3 standard says that we *must* use this dividing method ?
> Or is it only the recomendation ?

It's not in the standard at all; it's in the example implementation.

> 
> If it is only the recomendation, I hope it will be dramatically improvement
> the bit allocation to change the dividing method.

Better subdv tables gain you about 8%
Exhausive search gets you about 5% more

Ciao,

Segher

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