[theora] A comparison of VP3, and two MPEG-4 variants

Christoph Lampert chl at math.uni-bonn.de
Tue Mar 25 01:26:53 PST 2003

On Mon, 24 Mar 2003, Dan Miller wrote:

> well we can agree to disagree.  There is no reason why a properly
> designed multi-pass encoder cannot compress a file to a very close
> approximation of the desired total bit allocation using a fixed-Q
> approach.  At worst, it may dither between two sequential Q values
> simply because the codec's Q levels are too coarse.

Sure it can. But that this would mean encoding to optimal quality, that 
I doubt. Anyway, for benchmarking, comparing fixed Q is of course the only
way to test encoding efficiency without testing ratecontrol efficiency at
the same time. 


<p><p>--- >8 ----
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