[icecast] bit/bytes

oddsock oddsock at oddsock.org
Sun Feb 29 08:27:17 PST 2004



for most stations that have this kind of listener capacity, they are 
getting bandwidth from AOL/Nullsoft.  Nullsoft had (may still have) a 
policy of offering free bandwith to stations they hand-picked.  They 
were tapping into the rather huge amount of bandwidth that AOL had, and 
thus could offer the kind of listener capacity you are seeing.  
Alternatively, many stations also operate on bandwith donations (people 
offering relays because they like the station)....I'd say most (if not 
all) stations that have high listener capacity are operating using one 
of these two mechanisms.

oddsock

> Yeah, I knew they had several servers for the same content, but the
> financial cost of such internet connections still remain the same...
> 
> Cheers,
> 
> MAX
> -----Original Message-----
> From: owner-icecast at xiph.org [mailto:owner-icecast at xiph.org] On 
Behalf Of
> Joe Jones
> Sent: Sunday, February 29, 2004 1:33 PM
> To: icecast at xiph.org
> Subject: RE: [icecast] bit/bytes
> 
> 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.
> 
> 
> Joe.
> 
> 
> >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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