----- Original Message ----- From: "Dane Trethowan" <[EMAIL PROTECTED]>
To: "PC audio discussion list. " <[EMAIL PROTECTED]>
Sent: Thursday, September 02, 2004 3:00 AM
Subject: Re: VARIABLE BIT RATES WITH LAME, SOME NOTES
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Ok! well I have a comment to make on this subject.
What you said below seems very general, I mean their are different things that people may want to encode, (music and speech for example) and (from what I understand) ABR will not work too well with music (VBR is supposed to work better) so you can see my concern when a manual for a product recommends one form of encoding over another in this way, if the manual actually provides some background information as to why the recommendation is made then fare enough.
Secondly, without casting any doubts or making any criticisms towards CDEX,
I ask the question, just how old is the manual we're referring to. Its
over 18 months since I've used CDEX and allot has changed in that period of
time with LAME, allot of work has gone into improving the whole LAME
software so what the manual says about LAME may not be accurate any longer,
of course (me having not used CDEX for such a long time, I've lost touch
and (for all I know) their may ahve been subsequent update releases of CDEX
too!).
Now ABR and VBR, 2 very different systems. ABR works out the average bit rate of a file and encodes it that way where as VBR works on each frame of the file and encodes each frame to the best bit rate appropriate to that frame, if you have silence then encoding drops down to the minimum set (by default this is 32KBPS).
The settings I spoke of in my original message were designed to get maximum
compression and quality using VBR, if the quality setting is either too
high or too low you either end up with a small file of lousy quality or a
massive file of good quAlity audio, people are under the impression that
(with the VBR method) the higher the quality number the better the quality
encoding so I was just making the point that the quality setting doesn't
work as simply as that.
01:55 AM 2/09/2004 -0400, you wrote:Hi all. I hear in the CDex manual that abr is maybe better than vbr. If you use variable bit rate, you should use the average bit rate, or abr. ----- Original Message ----- From: "Dane Trethowan" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, September 01, 2004 7:18 AM Subject: VARIABLE BIT RATES WITH LAME, SOME NOTES
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Greetings!
Sorry! I'm all over the place with e-mail at the moment.
Some time ago, someone on list asked about VBR quality with LAME, they said
that they were getting mixed results with a quality figure of 9.
This will indeed be the case as (with the VBR encoding) 9 is the worst
quality you can use. The quality for VBR encoding is slightly different to
that of Constant bit rate encoding, the quality setting for VBR
encoding affects both the encoded audio nad the size of the file thus the
best quality figure is probably about 5, where you get maximum quality and
maximum compression.
LAME boasts 2 VBR methods, "OLD" and "NEW", "NEW", is very fast but doesn't
produce as good a results as does "OLD", which is considerably
slower. Naturally! this situation will change as time goes on.
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