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[ns] VBR video trace?



hi all...
I am doing some video simulations.
Is there any VBR video trace available?

By the way, mpeg1 is cbr or vbr?
            vcd is cbr or vbr?
In "Statistical properties of MPEG video traffic 
and their impact on traffic modeling in ATM systems" O. Rose
He uses mpeg1 software enconder and he calls it "vbr traffic".
But it seems that only mpeg2 support vbr.
Anyone could give me some advice about this?
thanks a lot... :)

           Jay...