[icecast] bitrate for slow modems

John Griffiths john at capmon.com
Thu Apr 5 15:12:18 PDT 2001



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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