[Freeswitch-users] New codec integration and concurrent calls limitquestions

Dmitry Lysenko dvl36.ripe.nick at gmail.com
Fri May 17 12:56:55 MSD 2013


I think they mean modified CS-ACELP codec based on g.729.
50 simultaneously channels is low number on quad core I7, even using ITU
reference implementation.



2013/5/17 Steve Underwood <steveu at coppice.org>

> On 05/17/2013 10:54 AM, Fernando Hernandez wrote:
> > Thanks a lot to both for your advice, it has been really useful.
> >
> > Stephen, yes, I am referring to BBB. And I have a question, as far as
> > BBB is not limited by software and we need to run conference larger
> > than 25 we need to scale the hardware. But, I would like to know about
> > the possibility to distribute BBB across multiple servers, how can we
> > do it? do you know if there is any documentation about it?
> >
> > And about Misheshu comments, I think the licence issue will be a
> > problem. The implementation of G.729 I am talking about is
> > proprietary, not open at all, so we need to find out if it is possible
> > to use it with FreeSWITCH (I am not well versed on the licensing
> > issues, so I will read the licenses and try to understand them).
> > You can check this comparison table to have an idea about this codec
> > performance,
> >
> > Imágenes integradas 1
> >
> > And finally, about audio transcoding. We use BBB and speex for the
> > encoding, but as Stephen said before, maybe the audio is not the only
> > problem we have. We need to run more tests...
> >
> > Thank you very much and best regards,
> >
> > Fernando Hernandez.
> What is this table supposed to indicate? u-law, A-law and most forms of
> ADPCM (the table doesn't indicate which one) are only designed for use
> at 8k samples/second, and give poor results when used at higher rates.
> G.729 can *only* be used at 8k samples/second. Its just useless at
> higher sample rates. If "capacity" is supposed to be the number of
> channels of the codec which can be supported on an i7-2720QM why is the
> number for G.729 so low? Even a poor implementation should be faster
> than 50 channels on a quad core processor like that. The G.729 for
> Freeswitch is certainly a lot faster than 148 channels on such a processor.
>
> Steve
>
>
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