[vorbis] quality settings

[John Denton]

OK, I'm confused.

I'm more than happy using the quality settings. But if I use the bitrate
settings (into OggEnc), I find:

-m96 -b192 -M320

gets into the Ogg file as -1, 192, -1 and OggEnc actually reports that it is
encoding with managed bitrates at 192 (no mention of min or max bitrates).

If I use just -M64 I find, in the Ogg file, -1, 64, -1 (min, nom, max). If I
use quality I get the same sort of figures (min and max always -1) -
although OggEnc has indicated that it is using VBR.

So as far as I can see -m and -M always result in -1 actually in the Ogg
encoded file and I can't tell any difference if I encode -b64 or -M64 (the
example given) -q0 sounds much better anyway.. The only use I can see for
bitrate encoding is that you can take the encoded bitrate above -q10.

Would someone exxplain.. Are the three (-m -b -M) intended to be used
together (to form a sort of encoding envelope) or are they intended to
perform some different function used separately (that is either -m or -b
or -M in a particular file)

<p><p><p>J.
----- Original Message -----
From: "Geoff Shang" <gshang at uq.net.au>
To: <vorbis at xiph.org>
Sent: Saturday, January 05, 2002 2:26 AM
Subject: Re: [vorbis] quality settings

<p>> On Fri, 4 Jan 2002, Philip M. White wrote:
>
> > At 08:26 1/4/2002, you wrote:
> > >He also said that RC4 will
> > >cope better with lower bitrates than RC3 currently does.  And this is a
> > >good thing.  Try doing 44.1khz stereo at 64kbps or lower.
> >
> > I encoded my entire Tchaikovsky CD into Ogg at quality 0, and to me in
my
> > pretty expensive headphones it sounds just like the original.  I have
good
> > ears, too! :)
>
> I was talking about -b 64 or -M 64, not -q 0.  This is an important
> distinction to make.  Whilst I wouldn't call -q0 transparent, it does
sound
> pretty good considering what it's trying to do.  -M 64 on the other hand
> sounds quite dodgy, (you can really hear it breathing), and -M 56 and -M
48
> sound much worse.  But apparently RC4 will sound much more acceptable and
> consistant.
>
> Geoff.
>
>
>
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<p><p>--- >8 ----
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