[vorbis] bitrate peeling

[Caleb]

No i don't think that there are any.

BTW, i wonder why the xiph guys didnt make any tool(s) that showcase
peeling...

Peeling can be useful in case u dont have the CD anymore, or the wav
file :)

BTW, does shoutcast automatically re-encode mp3s to lower bitrates??
coz a friend of mine played his mp3s which were 196kbps, and the radio
was only 96kbps.. i wonder how it works..

--- Andy Dale <andycool22 at peoplepc.com> wrote:
> so no other codecs really have peeling or at least not tools either?
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> ----- Original Message -----
> From: "Christian.Buchner" <Christian.Buchner1 at epost.de>
> To: <vorbis at xiph.org>
> Sent: Thursday, November 07, 2002 4:03 PM
> Subject: Re: [vorbis] bitrate peeling
> 
> 
> :
> :
> :
> : > do any other audio formats support peeling? cuz afaik you just
> reencode
> mp3z
> : > 'n' such to get lower bitrates also.
> :
> : Depends on the coding they use.
> :
> : As far as I know MP3 stores subband by subband in Huffman coding.
> : That means you can cut away whole subbands to cut off the high
> : frequencies for example. But that's about all you can do without
> : resorting to re-quantization.
> :
> : To be really peelable you have to code the data progressively.
> : And that is a form of art. ;)
> :
> : Bitplane coding for example can be used achieve that. You would
> : then encode bitplane by bitplane, for example using arithmetic
> : coding. And for peeling data off, you would simply drop the least
> : significant bitplanes. That is (somewhat simplified) what JPEG
> : 2000 does.
> :
> : I do not know enough about the entropy coding used in Vorbis
> : to comment on it. Maybe someone can shed some light on it with
> : a few sentences.
> :
> : Christian
> :
> :
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> 
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