[vorbis-dev] Major quality decrease in RC3 compared to RC2

[Daniel B. Miller]

now that we have managed bitrates, I imagine it shouldn't be difficult to
build an ACM component that would work properly with AVI files, right?

I realize the quality will suffer.

 ___  Dan Miller
(++,) Founder, CTO, On2.com

On Sun, 6 Jan 2002, Jack Moffitt wrote:

> > But - sorry for objecting your work - one thing is strange: the so-generated
> > ogg file sounds much better than the one I did before (using -b 128).
> > Nevertheless, the new one is a bit smaller in size. Or to put it the other
> > way round: "-b 128" gives you less quality at bigger filesizes than "-q 3.5".
> > That way I would say the bitrate-management in RC2 was more useable than the
> > new one. (Sorry.)
>
> This is perfectly normal.  -b 128 turns on bitrate management, as you'll
> see a little note pop up in oggenc.  "Encoding with managed bitrates."
> These are made to restrict the VBR vorbis engine to produce files that
> are better suited for environments like streaming.
>
> -M and -m are also bitrate management flags, and specific maximum and
> minimum bitrates respectively.
>
> This is the first cut of bitrate management, so the quality will
> improve.  At the same time, it's not expected that this be heavily used,
> since it's a specialized feature so that one can make guaruntees about
> bandwidth or hardware performance, etc.
>
> -q uses the unconstrained engine tuned for certain 'areas'.  -q0 will
> produce something aroudn 64kbps, -q4 around 128, etc.  But -q will
> always sound better than -b or -M.
>
> Hope this explains it well enough.
>
> jack.
>
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