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

<stephane.proust@orange.com> Wed, 13 March 2013 17:12 UTC

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From: <stephane.proust@orange.com>
To: Tim Panton <tim@phonefromhere.com>, "Bogineni, Kalyani" <Kalyani.Bogineni@VerizonWireless.com>
Thread-Topic: [rtcweb] Agenda time request for draft-marjou-rtcweb-audio-codecs-for-interop-01
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Date: Wed, 13 Mar 2013 17:12:06 +0000
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Cc: MARJOU Xavier OLNC/OLN <xavier.marjou@orange.com>, "rtcweb@ietf.org" <rtcweb@ietf.org>
Subject: Re: [rtcweb] Agenda time request for draft-marjou-rtcweb-audio-codecs-for-interop-01
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> 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

-----Message d'origine-----
De : rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] De la part de Tim Panton
Envoyé : mercredi 13 mars 2013 17:11
À : Bogineni, Kalyani
Cc : rtcweb@ietf.org; MARJOU Xavier OLNC/OLN
Objet : Re: [rtcweb] Agenda time request for draft-marjou-rtcweb-audio-codecs-for-interop-01



On 13 Mar 2013, at 14:37, Bogineni, Kalyani wrote:

> There are 6.4 billion cellular connections worldwide.
> 
> http://www.3gpp.org/3GPP-Family-2012-Statistics
> 
> Regards,
> Kalyani Bogineni

Following that logic we'd mandate GSM.610 since _all_ of those 6B devices support it.

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.

Tim.
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