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Today's Topics:
1. Well, THAT might be a problem: Virtual Server! (Gray Miller)
2. Using PHP to get number of users in Darwin (Graham Anderson)
3. Re: New to multicasting and large scale rtsp (Mark Fallu)
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Message: 1
Date: Fri, 18 Nov 2005 16:14:27 -0600
From: "Gray Miller" <email@hidden>
Subject: Well, THAT might be a problem: Virtual Server!
To: <email@hidden>
Message-ID: <email@hidden>
Content-Type: text/plain; charset="us-ascii"
Thanks to Ian and Doug for their info. I thought there might be some
kind of bandwidth throttle set on the server, so I contacted our IT
department to talk about the specifics of the server setup.
(A little background: I had set up a DSS on a dual Mac G4 here at the
studio as proof-of-concept; once we got the go-ahead, we had to give the
job to IT so that it would be accessible outside our firewall).
Turns out that we have this installed on a "virtual" machine, rather
than actual dedicated hardware. We're fixing that now, we'll see what
may change.
Thanks again.
Gray
----------------------------------------
Gray T. Miller
Telecast Operations Technician
email@hidden
(608) 663-1961
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Message: 2
Date: Fri, 18 Nov 2005 16:56:14 -0800
From: Graham Anderson <email@hidden>
Subject: Using PHP to get number of users in Darwin
To: email@hidden
Message-ID: <email@hidden>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
Is it possible to get the number of connected users on DSS with PHP
and/or some cgi script ?
I need to do this for a live streaming event....
So, basically, if there more than 150 users on a server....go to the
next server
I can make it happen if I can communicate with Darwin in some way :)
<?php
if(numConnectedUsers >200){
//goto this server
}
?>
Or, is there some kind of live updated text file that contains this info
If so, then I can fread the text file.
many thanks
g
------------------------------
Message: 3
Date: Sat, 19 Nov 2005 13:14:41 +1000
From: Mark Fallu <email@hidden>
Subject: Re: New to multicasting and large scale rtsp
To: Mark Fallu <email@hidden>
Cc: email@hidden
Message-ID:
<email@hidden>
Content-Type: text/plain; charset=ISO-8859-1
http://www.kontiki.com is the company the BBX and AOL are using to
implement their P2P based media distribution network.
Opensource alternatives exist but are not as developed - google p2p
streaming for more info.
On 11/18/05, Mark Fallu <email@hidden> wrote:
Sounds like you need to be investigating some of the peer to peer
options that are floating about, or investigate some of the edge
network stuff.
Multicast is generally restricted to individual networks - like in a
work place or a university campus - or even content offered by an
individual ISP.
The BBC is currently using peer to peer streaming to do their new
media distribution networks.
If you cant use p2p and cant afford the bandwidth you are currently
using - then it would sound like you:
a) have to convince them their demands are unreasonable (hard if you
just convinced them to give you the job and you didn't mention the
difficulty at the time)
b) have to investigate purchasing cheap bandwidth from streaming
company / edge network (akami etc)
c) Compress the hell out of the content or find other ways to limit
the bandwidth.
Option C is where you have the most control.
Without knowing the specifics of the type of audio video you are
dealing with it is impossible to make recommendations on how best to
compress your video. But if you are currently just using standard
settings - and all you are broadcasting is a talking head at a
shareholders meeting - then you can probably choose settings that are
more appropriate to that situation and that will save heaps of
bandwidth compared to full screen h264 2 30 fps.
Best of luck.
On 11/18/05, Marshall Eubanks <email@hidden> wrote:
> I maintain a multicast FAQ at
>
> http://www.multicasttech.com/faq .
>
> Multicast is generally not available on the commodity Internet; it's
> easy to
> set up relays with Darwin. To say much more would require more
> details.
>
> Regards
> Marshall Eubanks
>
> On Nov 17, 2005, at 11:13 AM, Graham Anderson wrote:
>
> > I just to took a gig where word-wide large scale rtsp is going to
> > be a big part of the job.
> > For them, unicasting has not been up to the task of their very
> > large audience.
> > Up to this point, peak rates are too high for them to manage.
> > Wonderfully, they are blaming QuickTime for this. Guess a scapegoat
> > was needed.
> >
> > So, is there a really good nuts and bolts primer on multicasting/
> > reflection or decent alternatives ?
> > Sending one stream out to 10-11 servers which reflects/tunnels the
> > stream to audiences in different geographic locations SOUNDS like
> > a good idea.
> > Is it not ?
> >
> > Other 'starter' questions include:
> > feasability of large scale rtsp... like managing client expectations,
> > sufficient a/v codecs to use,
> > reasonable bit rates of these codecs,
> > the server code syntax of the 'sdp' files, and other file formats
> > streaming servers to use: like Darwin vs Helix vs ???
> >
> > I prefer open source IF it works :)
> >
> > Be great to stream two formats: one stream for Real and QT, and
> > another stream for WMP
> > Pie in the sky, would love to stream one
> > format....but ...well...that's pretty unrealistic ;)
> >
> > I do not expect someone/anyone to respond to all of this....just
> > start a dialog and point me in a solid direction :)
> >
> >
> > many thanks
> > g
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