[Vorbis] Changing the bitrate (down) of an ogg file

[madsdyd at challenge.dk]

On Sat, 8 Jan 2005, Daniel Schregenberger wrote:

> On Sam, 2005-01-08 at 08:14 +0100, madsdyd at challenge.dk wrote:
> [...]
> > So my question is, if there is a tool to change the bitrate down to e.g. 
> > 220 kbps. I know I can do this with sox, or by decoding to wav, then 
> > recoding, but I was looking for a tool that "knew" ogg, and perhaps could 
> > change the bitrate in an "optimal" way, that is, throwing away the least 
> > significant components of the encoded file, or whatever.
> 
> You are searching for a peeler. 

Ah, I have been searching for hours for "recoding". Good to know the names 
;-)

> That is theoretical possible with Ogg
> (unlike mp3 and other formats) but I think still none exists.
> Unfortunately.
> 
> There was an effort of getting money to build one some time ago. What
> has happened there? I somehow lost track of it.

I found this:
http://wiki.xiph.org/Bounties

I reckon it is not possible then (yet). Or at least that no open 
source/Linux tool exist.

Could you perhaps recommend a "best" strategy for changing my ogg/vorbis 
256 kbps files into (say) 128 kbps files? I am capable of hacking scripts, 
and such, I am more looking for recommendation of the best tool: does sox 
produce good results, would you rather recommend ogg123 to wav, then 
oggenc, perhaps something entirely different?

Thanks in advance,

Mads

-- 
Mads Bondo Dydensborg.                               madsdyd at challenge.dk
The low quality of [MP3] files should prevent this format from threatening
control of our intellectual property. Why would anyone listen to a sub-CD
quality song when they can easily buy the CD at the local Tower Records?
                               - RIAA head, Hillary Rosen, March 1997