Re: [rtcweb] Agenda time request for draft-marjou-rtcweb-audio-codecs-for-interop-01

Tim Panton <tim@phonefromhere.com> Wed, 13 March 2013 19:35 UTC

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From: Tim Panton <tim@phonefromhere.com>
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Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>, "Bogineni, Kalyani" <Kalyani.Bogineni@VerizonWireless.com>, MARJOU Xavier OLNC/OLN <xavier.marjou@orange.com>
Subject: Re: [rtcweb] Agenda time request for draft-marjou-rtcweb-audio-codecs-for-interop-01
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On 13 Mar 2013, at 17:12, <stephane.proust@orange.com> <stephane.proust@orange.com> wrote:

>> I'd also like to point out that the "massive" transcoding cited already occurs between mobile devices that support various codecs (GSM, AMR etc) and the PSTN - (g711, g729) and the sky hasn't fallen yet.
> 
> But transcoding to G.711 has simply absolutely nothing to do in terms of impact on gateways costs and capacities !
> Transcoding to G.711 almost cost nothing.
> For your information: complexity of G.711 is around 0,01 WMPOS when AMR-WB is at 40 WMOPS and OPUS still higher... 
> So we speak about a factor of more than 1000 in terms  transcoding complexity and related impact on gateways !
> And even with respect to AMR, G.722 or AMR-WB, transcoding from/to OPUS will still be more costly
> 
> Stéphane


When the PSTN <-> mobile network gateways were first set up the cpus were 1000x slower. 
No one seriously considered imposing G711 on the mobile network, because it was unsuitable.

T.