Re: [Stox] stox-media: format parameter translation
Peter Saint-Andre <stpeter@stpeter.im> Thu, 20 March 2014 03:50 UTC
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Date: Wed, 19 Mar 2014 21:50:28 -0600
From: Peter Saint-Andre <stpeter@stpeter.im>
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To: Jonathan Lennox <jonathan@vidyo.com>, "stox@ietf.org" <stox@ietf.org>
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Archived-At: http://mailarchive.ietf.org/arch/msg/stox/1kUKYs73oruR4fF9VZ43ueehyf8
Subject: Re: [Stox] stox-media: format parameter translation
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On 1/9/14, 10:22 AM, Jonathan Lennox wrote: > This is the issue I brought up at the Interim -- I'll try to put it > in writing. > > The point I raised is that the stox-media draft's section on format > parameter translation should try to focus on media types which are > actually used by existing, deployed Jingle clients, since this is > probably a relatively small set. The important question is which > payload formats in use by existing Jingle clients have SDP fmtp > formats that don't follow the normal semicolon-separated parameter > model. > > I of course haven't done a full inventory of such payload formats, > but two that seem reasonably likely and I think should be > particularly called out are: > > audio/telephone-event: RFC 4733: the fmtp contains the value of an > implicit "events" parameter. That one seems relevant. > audio/red: RFC 2198, with its media type registration in RFC 3555: > the fmtp is the payload types of the encompassed formats. The RFC > 3555 definition of the actual media type parameters is weird (in an > attempt to make it self-contained), and I doubt that any Jingle > client that does RED would actually use it that way. So we need to > figure out what any actual Jingle implementations do. > > Does anyone have a reasonably-authoritative list of which RTP payload > formats are supported by existing Jingle clients? I do not, but it's a small enough universe that we can poll the developers. (I expect it's mostly limited to common audio and video payloads - Speex, Opus, etc. - but we'll find out.) > Does anyone know > of any other real-world usage of codecs that have unusual fmtp > encodings? I think audio/telephone-event is a possibility. > Someone on the call mentioned that they thought that > Speex's was weird, but as far as I can tell, it's a normal > semicolon-separated encoding. Agreed. Peter
- [Stox] stox-media: format parameter translation Jonathan Lennox
- Re: [Stox] stox-media: format parameter translati… Peter Saint-Andre
- Re: [Stox] stox-media: format parameter translati… Saúl Ibarra Corretgé
- Re: [Stox] stox-media: format parameter translati… Peter Saint-Andre - &yet