Vorbis dev - Mar 2005 - CBC ogg/vorbis stream

Hi List!

In another forum [linux-audio-dev], I wrote:
> CBC Toronto is evaluating the Ogg Vorbis format for Internet 
> streaming.
> You can find it here:
> 
>  $ ogg123 http://oggtrial.nm.cbc.ca:80/cbcr2-toronto.ogg
> 
> It is only 32Kbit but, considering the low bandwith, sounds amazingly
> good. There are some annoying artifacts though:
> 
>   Certain announcers gets very metallic voices
>   Piano, Viola da Gamba etc "flutters" reminiscent of a cassette 
>   player.
> 
> Any idea why it flutters? Is it my player, their encoding setup or
> perhaps a limitation in the Vorbis codec itself?
> 
> 
> Oh, and remember to visit their feedback section to give them a thumbs
> up :)
> 

I have since then learned that mp3 also flutters/bubbles at extreme low
sample rates.

This is most pronounced with ie soft solo-piano. Would it help to lower
the samplerate for solo-piano?. Could it be autodetected?

The goal being listening to the musician and the music, rather than his
annoying (lack of?) equipment.
-- 

   (
    )
  c[]  //  Jens M Andreasen

Jens M Andreasen wrote:
>>Any idea why it flutters? Is it my player, their encoding setup or
>>perhaps a limitation in the Vorbis codec itself?
As far as I can see they are using an old, old encoder:

Xiph.Org libVorbis I 20030909 (1.0.1)

The latest official Xiph.org Vorbis version 1.1.0 has some very nice low
bitrate improvements. The vorbis.com website is, however, quite outdated
- so I recommend getting latest Ogg Vorbis encoders from
http://rarewares.org/ogg.html when you can?t compile from source code.

Even better than Vorbis 1.1.0 are the latest "aoTuV" encoders - you
can
get them at http://rarewares.org/ogg.html too.

The "megamix" or "GT3b2" encoders are mainly tweaked for
high bitrate
encodings - don?t use them for 32 kbps streaming.

Maik