[vorbis] just an idea about quality evaluation

Daniel Schregenberger npfdd at gmx.net
Sat Jan 25 13:32:35 PST 2003


 ('binary' encoding is not supported, stored as-is)
Lorenzo Prince wrote:

> The problem with using technical methods to judge the quality of a
> perceptual codec is that the codec is designed to be tuned to the human ear.

hmmm...maybe this is a bad idea too, but couldn't I use it then to see the
difference of two lossy formats? I mean encode a wav with q4 and q5 and see how
different the output was with the method Stoffke described.
Or maybe to find some decent quality settings to convert mp3s to ogg: If I have
a 256k mp3, what quality should I use to

a) not lose to much (converting is bad I know, but 256k -> q10 shouldn't be
that bad)
b) not waste too much space (maybe 256k -> q8 results in almost the same)

-- Daniel

<p>"Not only is this incomprehensible, but the ink is ugly and the paper
is from the wrong kind of tree."
                -- Professor W.

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