Re: [rtcweb] confirming sense of the room: mti codec

David Singer <> Fri, 12 December 2014 23:39 UTC

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From: David Singer <>
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Date: Fri, 12 Dec 2014 15:39:38 -0800
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Subject: Re: [rtcweb] confirming sense of the room: mti codec
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> On Dec 12, 2014, at 8:32 , Iñaki Baz Castillo <> wrote:
> 2014-12-12 16:27 GMT+01:00 Gaelle Martin-Cocher <>:
>> The question is not do we need multiple codecs but do we need multiple MTIs (and which).
> We need MTI codecs, but no patent/license polluted ones.

I think hoping for an RF codec is optimistic but may be achieved.  Hoping for a codec which has needs/has no license is definitely further out on the optimism scale.

We can hope for Reasonable licenses, of course, but then we rapidly find that we don’t have a consensus definition, in the industry, for what is reasonable. I have struggled with this for years.

> That's the
> reason of my question. Will those non 100% RF video codecs be removed
> as MTI *if* a new 100% RF good video codec appeared? Will we have to
> deal with non RF MTI codecs forever?
> The arguments I'm reading in this thread about the no-need for more
> MTI codecs in the future could also be applied for the no-need of
> defining any MTI codec now. At the end we do have a "codec
> negotiation/capability discovery" mechanism, right?

My experience is that once something is mandatory in a spec., it can get very wedged; people say (reasonably) it has to remain mandatory to ensure interop with the established base.  Part of my concern is that it may lock almost everyone into a state of perpetual unhappiness.

For example, it took many years to get 3GPP to move H.263 from mandatory to only recommended. :-(

This is, I admit, at odds with the “be agile” mood of the times.  YMMV.

best wishes of the season! sorry to be dismal.

David Singer
Manager, Software Standards, Apple Inc.