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

Marco Al marco at simplex.nl
Tue Mar 25 12:10:50 PST 2003

From: "Colin Mckellar" <blibblelibby at black-market-babies.com>

> I use a constant quantizer when possible.
> Even though many people do not use constant quantizer when encoding, I
> think it is still relevant, as it gives the best over all quality that
> a codec can produce.

Sure, if you are using a fixed quantizer of 1 for all frequencies the codec
can be said to produce the best quality it can overall.

How meaningfull is that though? Most people are interested at the best
overall quality at a given filesize, or the smallest file at a given
quality. Fixed quantizer does not give the best overall quality in the first
case, precisely because fixed quantizer does not give fixed quality (which
covers the second case).


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