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Re: [rtcweb] Call for Consensus Regarding Selecting Recommended Audio Codecs

<Markus.Isomaki@nokia.com> Thu, 20 December 2012 11:23 UTC

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From: Markus.Isomaki@nokia.com
To: magnus.westerlund@ericsson.com, rtcweb@ietf.org
Thread-Topic: [rtcweb] Call for Consensus Regarding Selecting Recommended Audio Codecs
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Date: Thu, 20 Dec 2012 11:23:49 +0000
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Subject: Re: [rtcweb] Call for Consensus Regarding Selecting Recommended Audio Codecs
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Hi,

I think we should make an attempt at 1), i.e. to at least find out if there is a consensus on such as small set of recommended codecs. I don't know what is small, but I would say no more than 1-3. And there has to be a convincing case for each why they add value over G.711 AND Opus.

My proposal would be to recommend AMR, and perhaps AMR-WB. The rationale is that those codecs are widely supported in mobile devices and in Circuit Switched and IMS/LTE based VoIP telephony. So they are helpful for transcode-free interoperability with the current and future :-) legacy systems, and in that dimension they would add value to G.711 and Opus. It is not a relevant use case for all WebRTC services, but to a large enough set I believe. Quite many people even proposed AMR/AMR-WB as mandatory for WebRTC. The main reason it was not acceptable was the IPR situation, which quite a few saw inhibitive. That has not changed, but I think the deliberations in that regard are different for "recommended" than "mandatory".

Markus


>-----Original Message-----
>From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf
>Of ext Magnus Westerlund
>Sent: 20 December, 2012 10:30
>To: rtcweb@ietf.org
>Subject: [rtcweb] Call for Consensus Regarding Selecting Recommended
>Audio Codecs
>
>WG,
>
>As an outcome of the Vancouver IETF meeting codec discussions we did
>promise to run a call for consensus regarding if the WG was interested in
>specifying a small set of recommended audio codecs. We are sorry this has
>been delayed until now.
>
>The question for the call of consensus is between two options.
>
>1) Run a process in the WG to select and specify a small set of audio/speech
>codecs that would be RECOMMNEDED to implement by a WebRTC end-points
>
>2) Do nothing and let the already specified Mandatory to Implement Audio
>codecs be the only audio codecs mentioned in the WebRTC specification.
>
>Please indicate your position by January 16th 2013.
>
>Regards
>
>Magnus Westerlund
>
>----------------------------------------------------------------------
>Multimedia Technologies, Ericsson Research EAB/TVM
>----------------------------------------------------------------------
>Ericsson AB                | Phone  +46 10 7148287
>Färögatan 6                | Mobile +46 73 0949079
>SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com
>----------------------------------------------------------------------
>
>_______________________________________________
>rtcweb mailing list
>rtcweb@ietf.org
>https://www.ietf.org/mailman/listinfo/rtcweb

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