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

[Per Wigren]

I've noticed that a lot of my old (70s/80s) punkrock records uses a very high 
bitrate compared to newer music.. I don't think it is because the punk is 
more "noisy" (in fact, a lot of the music is not noisy at all, even quite 
soft sometimes), but because they are cheap recordings with a lot of "silent 
subnoise" like a buzzing amplifier or two in the background, cheap 
microphones that distorts a little on loud sounds etc...
I also have well-produced 90s punkrock and death+black metal that although the 
music is _extremly_ noisy, vorbis needs very few bits to encode at super 
quality....

// Wigren

Tuesday 22 October 2002 02.15 skrev 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.
>
>
> <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?
>
>
> 	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.
>
>
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