[vorbis] how low can it go... vorbis streaming

[Smörk]

Hi!

We have a little problem. We have to get 4 channels through a Dual-ISDN
Line (128k). MP3 sounds awful (tested with lame 24k). Real sounds good,
but I cannot encode 4 mono streams from a 4 channel soundcard, only 2
stereo streams.

So I tested Vorbis. I encoded a 22050Hz mono file with -b 112, but this
has a average bitrate of 59kbps. the 44100 mono file is 94kbps in
average and the stereo 44100 108kbps. It was the same song converted
with sox. The stereo file is only 14kbps bigger than the stereo file.

How could I achive lower bit rates without reducing the sample rate
below 22050Hz? I wonder how good Vorbis is at lower bitrates. At 60kbps
Vorbis and Lame sounds nearly the same.

Is there a streaming program vor vorbis and icecast? I compiled icecast
2.0, but cannot test it with live streaming (I was not able to compile
example). Are there any differences to the icecast 1.3.7 protocol (for
the encoder side)?

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