[icecast] bit/bytes

Joe Jones joe_jones64 at hotmail.com
Sun Feb 29 04:33:19 PST 2004



If you look at the PLS file for SomaFM's "Goove Salad" channel you'll see :

------------------------------------------------
[playlist]
numberofentries=3
File1=http://64.236.34.97:80/stream/1018
Title1=SomaFM Presents: Groove Salad 128k (Feed #1)
Length1=-1
File2=http://205.188.245.133:8076
Title2=SomaFM Presents: Groove Salad 128k (Feed #2)
Length2=-1
File3=http://server2.somafm.com:8032
Title3=SomaFM Presents: Groove Salad 128k (Feed #3)
Length3=-1
Version=2
-----------------------------------------------

So for this channel they have 3 possible feeds to spread the load over.  You 
could be clever and set up some sort of 'round-robbin' system to spread the 
load evenly...but I imagine that in this case it's deteremined by the number 
of connections per server - Feed #1 fills up to max of say 500 users...so 
next user is forwarded to Feed #2.

<p>Joe.

<p>>From: "MacSym" <macsym69 at yahoo.fr>
>Reply-To: icecast at xiph.org
>To: <icecast at xiph.org>
>Subject: RE: [icecast] bit/bytes
>Date: Sun, 29 Feb 2004 13:16:55 +0100
>
>Hi Goeff,
>
>Thanks for your precisions. You wrote: "Internet connections are also
>expressed in bits, or kilobits, not Kilobytes"; then I guess a connection 
>of
>1Mb is also 1 megaBITS and NOT megaBYTES. There is something I don't
>understand; how are affording small radios that have up to 1000 concurrent
>listeners a 128Mb connection? Is there any magical solution I am not aware
>of?
>
>Thanks for clarifying this topic!
>
>MAX
>
>-----Original Message-----
>From: owner-icecast at xiph.org [mailto:owner-icecast at xiph.org] On Behalf Of
>Geoff Shang
>Sent: Sunday, February 29, 2004 12:59 PM
>To: icecast at xiph.org
>Subject: Re: [icecast] bit/bytes
>
>On Sun, 29 Feb 2004, MacSym wrote:
>
> > A 128K stream is a 128 KiloBITS (NOT kiloBYTES) per second stream; am I
> > right?
>
>Right.
>
> > Is a 512k internet connection a 512 kiloBITS or 512 kiloBYTES
> > connection?
>
>Internet connections are also expressed in bits, or kilobits, not
>kilobytes.  In this sense, calling it a 512k connection is actually wrong,
>as this implies kilobytes, not kilobits.  But everyone seems to do it.
>
> > 128 KiloBITS = 16 KiloBYTES (8 bits = 1 byte). I am wondering if a 512k
> > connection (upload and download) could THEORITICALLY handle 4 (512/128) 
>or
> > 32 (512/16) 128k streams?
>
>Unfortunately it's 4, not 32.
>
> > I am confused because I often read that to calculate the potential 
>number
>of
> > listeners with a given connection; you just divide the connection speed 
>by
> > the stream bit rate... is it true? In this case, how is doing SomaFM to
> > handle 4000 listeners at 128k?? Do they have a 512 MB connection???
>
>I guess they must.
>
>Geoff.
>
>
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