Re: [rtcweb] Query Regarding Mandatory audio codecs draft

Steev James <steev.a.james@gmail.com> Mon, 28 April 2014 09:25 UTC

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Date: Mon, 28 Apr 2014 14:55:55 +0530
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From: Steev James <steev.a.james@gmail.com>
To: Jean-Marc Valin <jmvalin@mozilla.com>
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Cc: "kiran.guduru@samsung.com" <kiran.guduru@samsung.com>, rtcweb@ietf.org, cary.bran@plantronics.com
Subject: Re: [rtcweb] Query Regarding Mandatory audio codecs draft
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Means you say that G.711 uses less bandwidth than Opus at the expense of
complexity.

Am I right ?


On Mon, Apr 28, 2014 at 11:23 AM, Jean-Marc Valin <jmvalin@mozilla.com>wrote:

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> So, if the other endpoint only supports G.711 (legacy), then it
> doesn't matter which codec you offer first. The the other endpoint
> supports both Opus and G.711, but only at 8 kHz, then it comes down to
> which of complexity or bandwidth is more important. On a corporate LAN
> you'd likely want to use G.711 while for chatting from your home,
> you'd usually want Opus. This is why the draft makes has no SHOULD
> when it comes to narrowband.
>
>         Jean-Marc
>
> On 28/04/14 12:40 AM, Steev James wrote:
> > Paul, What do you say, if another end point is using both G.711 and
> > Opus at 8kHz and why ?
> >
> > Steev.
> >
> >
> >
> >>> Is that means spec is recommending G.711 (PCMA/PCMU) for
> >>> sampling
> > rate
> >>> less than or equal to 8 kHz?
> >>
> >> No. Opus is still a good idea for 8 kHz, but it's not 2119
> >> RECOMMENDED since there are valid (mostly complexity-related)
> >> reasons to use G.711 despite the higher bit-rate.
> >>
> >> Jean-Marc
> >
> > Opus isn't a good idea for 8 KHz if you are trying to inter-operate
> > with another end-point using G.711.
> >
> > ...Paul
> >
> >
> >
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