[icecast] bitrate for slow modems

Kelly Lee Myers k_myers at kyxpyx.com
Thu Apr 5 15:05:26 PDT 2001



Depending on what you are broadcasting, for 28.8 I would go 16kbps and be
really safe...

Lithium
----- Original Message -----
From: "John Griffiths" <john at capmon.com>
To: <icecast at xiph.org>
Cc: <icecast at xiph.org>
Sent: Thursday, April 05, 2001 3:12 PM
Subject: [icecast] bitrate for slow modems

> ok so 24kbps for 56k modems...
>
> can i go any lower and get the 28 k modems? (still a lot of them about) or
will 24 be good enough fo that?
>
> At 04:57 PM 4/4/2001 -0700, Jack Moffitt wrote:
> >> >
> >> > the bitrate on the mp3's is 128 (great for listening off the HD)
> >> >
> >> > whats a good bitrate to encode for streaming audio?
> >>
> >> I think this might be the problem 128kbps isn't going to work over a
modem.
> >>
> >> I think 24kbps is probably the pratical limit for 56k modems. 56k
modems might
> >> be able to get a 32kbps stream but only under optimal conditions.
> >
> >I believe he said the outgoing stream was two 128k ISDN lines, which
> >from my ISDN memory I remember as actually having a 112k throughput (the
> >other channel being used for signalling, etc).  Since you can only push
> >packets out one at a time with a single tcp connection (i think) 128 is
> >definately not going to make it out, even if the one possible listener
> >could receive data that fast.
> >
> >So a lower bitrate is most certainly necessary.  24kbps is a good one to
> >choose if you're interested in modem listeners.  A lot of people like
> >56k but I don't think they realize that most people with 56k modems get
> >more like 40k throughput or so.  I think going higher than 100k is
> >fairly wasteful.
> >
> >jack.
> >
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