Re: [rtcweb] revisiting MTI

Eric Rescorla <ekr@rtfm.com> Tue, 16 December 2014 20:40 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Tue, 16 Dec 2014 12:40:10 -0800
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To: Gaelle Martin-Cocher <gmartincocher@blackberry.com>
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Subject: Re: [rtcweb] revisiting MTI
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On Tue, Dec 16, 2014 at 12:35 PM, Gaelle Martin-Cocher <
gmartincocher@blackberry.com> wrote:
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> *From:* Eric Rescorla [mailto:ekr@rtfm.com]
> *Sent:* Tuesday, December 16, 2014 2:59 PM
> *To:* Gaelle Martin-Cocher
> *Cc:* John Leslie; rtcweb@ietf.org
> *Subject:* Re: [rtcweb] revisiting MTI
>
>
>
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> On Tue, Dec 16, 2014 at 11:56 AM, Gaelle Martin-Cocher <
> gmartincocher@blackberry.com> wrote:
>
> I am not sure on what you are basing your opinion.
>
>
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> As I said, the purpose of an MTI is to provide basic interop.
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>
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> That point is clear to all.  Sorry I was referring to “I would not
> imagine that we
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> would define a new required codec unless it was not just technically
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> superior but also definitively RF in the sense contemplated by Adam's
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> text.”
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> And I am not sure that holds true.
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>
Making a new non-RF codec MTI doesn't enhance basic interop.

  Waiting for an RF technically superior codec might not be pragmatic and
> can indeed prevent any evolution of WebRTC codec for a long time.
>
> Deprecating MTI can be done in steps (e.g. become SHOULD, then MAY)
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>
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> If this MTI text prevents codec evolution, this is a serious issue.
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> It doesn't prevent codec evolution. That's why we have negotiation.
> Browsers
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> are free to implement non-MTI codecs and I would anticipate that they
>
> will do so.
>
> And non-browser as well, but the spec will let us stuck for ever with low
> performing codec.
>

This doesn't follow at all. The IETF is free to in the future designate some
other codec as MTI and these not and this text doesn't preclude that.

-Ekr


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