Re: [MEDIACTRL] Issue with mixer package <codec> element
Chris Boulton <chris@ns-technologies.com> Fri, 08 October 2010 10:13 UTC
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Date: Fri, 08 Oct 2010 11:14:39 +0100
From: Chris Boulton <chris@ns-technologies.com>
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Subject: Re: [MEDIACTRL] Issue with mixer package <codec> element
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+1. On 08/10/2010 04:47, Victor Paulsamy wrote: > Likewise -- works for me too. > > --victor > > On Fri, Oct 8, 2010 at 5:37 AM, Eric Burger > <eburger@standardstrack.com <mailto:eburger@standardstrack.com>> wrote: > > Works for me. Anyone else? > > On Oct 7, 2010, at 4:49 AM, McGlashan, Scott wrote: > > > Hi Jonathan, > > > > Thanks for the comment and apologies for the delay. > > > > Reviewing the XCON's definition, I see that they have a name > attribute > > which we have mistakenly not put in our definition of <codec>. > > > > Unless anyone on the mailing list objects, I'll add a mandatory name > > attribute to the <codec> element which specifies the top-level > media type > > of the codec. I'll also fix up the definitions of name and > <subtype> to > > map to the type-name and subtype-name of RFC 4288 as well as the > examples. > > > > Thanks > > > > Scott > > > > > > > > > > On 25/03/2010 21:58, "Jonathan Lennox" <jonathan@vidyo.com > <mailto:jonathan@vidyo.com>> wrote: > > > >> I'm sorry this is being raised so late, but I was looking over > the mixer > >> package's definition of <codec> (to recommend that MRB copy its > >> definition for its <rtp-codec>), and realized there was a problem. > >> > >> The problem is that mixer package's definition of <codec> > includes only > >> the media subtype (e.g. pcmu or h264), not its top-level media type > >> (audio or video). In most cases subtypes are unique, but there > are a few > >> "container" subtypes (e.g. rtx, fec, or red) that are registered as > >> multiple top-level types. I believe this is only by convention > and good > >> practice, however; RFC 4288 requires only that the type/subtype > pair be > >> unique. > >> > >> My recommendation would be to add a <type> element under > <codec>, whose > >> definition is the top-level content type, leaving <subtype> as the > >> subtype. (An alternative would be to change to only using > <type> as > >> type/subtype, e.g. audio/pcmu, which would probably be equally > good, but > >> this might make life unnecessarily harder for implementations > that want > >> to try to maintain backward compatibility with the draft as-is.) > >> > >> It is probably also worth pointing out that both type and > subtype names > >> are not case-sensitive. > >> > >> The other (minor) problem is that I'm not sure the defining the > values of > >> <subtype> by reference to a column IANA's RTP Payload Format > media types > >> table is the best choice, among other reasons being that that > table is > >> very incomplete, missing, for instance, video/h264. (This has been > >> raised with IANA.) I would instead define the value simply as > "the name > >> of the subtype of the codec's media format". The reference to > RFC 4855 > >> can remain. > >> > >> -- > >> Jonathan Lennox > >> Vidyo, Inc > >> jonathan@vidyo.com <mailto:jonathan@vidyo.com> > >> > >> > >> _______________________________________________ > >> MEDIACTRL mailing list > >> MEDIACTRL@ietf.org <mailto:MEDIACTRL@ietf.org> > >> https://www.ietf.org/mailman/listinfo/mediactrl > >> Supplemental Web Site: > >> http://www.standardstrack.com/ietf/mediactrl > > > > _______________________________________________ > > MEDIACTRL mailing list > > MEDIACTRL@ietf.org <mailto:MEDIACTRL@ietf.org> > > https://www.ietf.org/mailman/listinfo/mediactrl > > Supplemental Web Site: > > http://www.standardstrack.com/ietf/mediactrl > > > _______________________________________________ > MEDIACTRL mailing list > MEDIACTRL@ietf.org <mailto:MEDIACTRL@ietf.org> > https://www.ietf.org/mailman/listinfo/mediactrl > Supplemental Web Site: > http://www.standardstrack.com/ietf/mediactrl > > > > _______________________________________________ > MEDIACTRL mailing list > MEDIACTRL@ietf.org > https://www.ietf.org/mailman/listinfo/mediactrl > Supplemental Web Site: > http://www.standardstrack.com/ietf/mediactrl -- Chris Boulton CTO & Co-founder NS-Technologies <http://www.ns-technologies.com> m: +44.7876.476681
- [MEDIACTRL] Issue with mixer package <codec> elem… Jonathan Lennox
- Re: [MEDIACTRL] Issue with mixer package <codec> … McGlashan, Scott
- Re: [MEDIACTRL] Issue with mixer package <codec> … Eric Burger
- Re: [MEDIACTRL] Issue with mixer package <codec> … Victor Paulsamy
- Re: [MEDIACTRL] Issue with mixer package <codec> … Chris Boulton
- Re: [MEDIACTRL] Issue with mixer package <codec> … Lorenzo Miniero