[speex-dev] Server based audio merge

[Allen Drennan]

I tend to disagree.  It normal human conversation it wouldn't make much
sense to have 2 people talking over each other at the same time.  Thus,
it most scenarios you would have only one talker anyway.  Additionally,
encode->decode/mix/encode->decode isn't a very efficient CPU process for
a server, it's complicated to keep timing correct and it has a negative
impact on total latency.
 
The overhead required to mix merge and re-encode is usually not worth
the benefit as in most situations you are not really saving any
bandwidth.

-----Original Message-----
From: owner-speex-dev at xiph.org [mailto:owner-speex-dev at xiph.org] On
Behalf Of Carsten Breuer
Sent: Thursday, November 20, 2003 1:56 PM
To: speex-dev at xiph.org
Subject: [speex-dev] Server based audio merge

Hi all,

<p>once again i came up with my conferencing stuff.

On a conference with more then two people it's a waste
of bandwidth, that every entity send it's data to every
entity. Since there is only one audio line, the audio must
be merged on the server.

Here are my questions:

- How many audio chanels can a server process (let's say a 3GHz machine)
   in this way: decode all speex chanels, merge them into one chanel and
   then encode the result again? This means that some chanels are merged
   to one chanel and this multiple.
- Could aditional DSP-PCI-Boards help to do this?
- Is it posible to merge without decode?

Any help is welcome.

Thanks,

<p><p>Carsten Breuer

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