[vorbis] How to fit Oggs in a specific amount of space?

[Amy Schoenhofen]

By the time you typed this up and sent it on its way, you could have
graphed the major points :)

Honestly, wouldn't different music types would compress to different
sizes, so I wouldn't think you can get a one-size-fits-all lookup table.

<p><5 minutes of comparing music length to file size later>

Well, more and less difference than I thought. Depends on the artist
more than the genre, I guess.
Most music at q5.0 is about 1.05mb per 60 seconds, but I can tag a few
of the more "busy" artists and watch them consistently go to 1.2mb,
1.3mb per 60 seconds.

-----Original Message-----
From: owner-vorbis at xiph.org [mailto:owner-vorbis at xiph.org] On Behalf Of
Martin Fontaine
Sent: Monday, October 21, 2002 6:13 PM
To: vorbis at xiph.org
Subject: [vorbis] How to fit Oggs in a specific amount of space?

<p>        I took 5 albums (Classical music) and converted them to Ogg
Vorbis 
at "Full Bitrate" (-q10) and all 5 directories take up about 775 Megs 
which won't fit on a CD.  So I ripped them again in WAV first (And 
give my friend back his CDs) but now I wanna know what quality 
setting should I use to fit them on 1 CD (The highest possible with 
total space used just under 700 Megs)

        Is there a tool available that will analyse WAV files and
determine 
the "Nominal Deviation Factor" or something like that to figure out 
what quality setting I need to use to fit them in a specific amount 
of space.  Is this even consistant?  By that I mean if a certain song 
encoded at q4 (128k nom.) gets an average of 120kbps does that mean 
the same song encoded at q8 (256k nom.) will get an average of 
250kbps?  Or if it's not linear is there a way to predict the q 
setting to use.

<p>--- >8 ----
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