[icecast] Q: Is it possible?

Raúl Wild-Spain rcruz at wild-spain.com
Fri Feb 13 05:50:09 PST 2004



oh!, very good graphics. These solve enough of my doubts about  "practices". Very thanks Enrico.    

Well, according to H323 graphic, it will be necessary to establish N to (N-1) channels on each speaker ...  or it seems. In any case I must to read about H323 a Mega-bit more ... ;-))

I suppose today someone must have solved this problem and it must exist some solution ... and open solution ;-)

I hope ...

best regards,

----- Original Message ----- 
From: "Enrico Minack" <enrico.minack at informatik.tu-chemnitz.de>
To: <icecast at xiph.org>
Sent: Friday, February 13, 2004 12:00 PM
Subject: Re: [icecast] Q: Is it possible?

<p>> > You will hit two problems though.  The first is that you will need to have
> > a stream for remote participants to listen to.
> Yeah, that's right. If you want the remote speakers to be able to listen to
> the other speakers this becomes a little complicated. If you hear your own
> voice with a latency more than 1/10 or 1/5 second it becomes very
> distracting! This latency really is a problem.
> 
> And mixing a certain signal for every remote speaker also means a huge
> effort. And you need to decode each of this signal, which means you need to
> create N MP3 streams, that's a lot of CPU laod.
> 
> But the remote Users don't need to hear the local speaker in 128kBit
> quality, therefore you could establish a H323 session with all remote
> speakers and the local speaker in it (if H323 works with multiple clients,
> I'm not sure). This can be in low quality. Everybody can hear the other
> speakers and vice versa. For broadcasting, the high quality signal from each
> remote speaker is send to the studio (just one direction).
> 
> Here are pictures of the two layers, layer 1 is the icecast MP3-stream,
> layer 2 is the H323 RTP-stream:
> http://www-user.tu-chemnitz.de/~mie/layer_1.gif
> http://www-user.tu-chemnitz.de/~mie/layer_2.gif
> 
> But I doubt that 2 programs (ices and the H323 software) can capture the
> microphone channel of one soundcard simultaniously. Maybe there are
> technologies out there to grant multiple access (I am sure there is),
> otherwise two soundcards and two mics at each remote speaker location would
> be necessary :-(
> 
> Well, this is getting quite complex ;-) I love it, though!
> 
> Enrico
> 
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