Re: [Sframe] [dispatch] Magnus Westerlund's Block on charter-ietf-sframe-00-00: (with BLOCK and COMMENT)

Magnus Westerlund <magnus.westerlund@ericsson.com> Mon, 14 September 2020 14:12 UTC

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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
To: "magnus.westerlund=40ericsson.com@dmarc.ietf.org" <magnus.westerlund=40ericsson.com@dmarc.ietf.org>, "rlb@ipv.sx" <rlb@ipv.sx>, "sergio.garcia.murillo@gmail.com" <sergio.garcia.murillo@gmail.com>, "sergio.garcia.murillo@cosmosoftware.io" <sergio.garcia.murillo@cosmosoftware.io>
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Thread-Topic: [dispatch] [Sframe] Magnus Westerlund's Block on charter-ietf-sframe-00-00: (with BLOCK and COMMENT)
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Date: Mon, 14 Sep 2020 14:12:27 +0000
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Subject: Re: [Sframe] [dispatch] Magnus Westerlund's Block on charter-ietf-sframe-00-00: (with BLOCK and COMMENT)
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Sergio,

Having 20 years of experience with RTP payload format designs some of your
formulations made me a bit worried. After this discussion I think we are much
closer on a common understanding of the high level functionality necessary. 

However, there will be questions about where we document that interaction and
what dependencies that do exist on other specificaitons for scalable codecs that
are generic and is desirable to require from RTP middleboxes. In addition even
without RTP there will be need from the application to consider how it can
utilize one SFRAME key and its IVs to carry multiple application sub-streams and
the need to expose that to lower layer transport function to achiveve
performance goals. 

So I think some clarification on the RTP payload format work, and it that is
going to happen in the SFRAME WG. If happening in SFRAME WG I would like to have
a joint WG Last call with AVTCORE WG. 


On Mon, 2020-09-14 at 11:39 +0200, Sergio Garcia Murillo wrote:
> 
> This is already possible for any SVC codec re-using the Dependency 
> Descriptor header extension:
> 
> 
https://protect2.fireeye.com/v1/url?k=6efce3ab-305c2002-6efca330-86959e472243-20fbdf13d7e98258&q=1&e=d4082b1d-c5ac-4946-be12-6a70a4838aa1&u=https%3A%2F%2Faomediacodec.github.io%2Fav1-rtp-spec%2F%23a1-introduction
> 

So should defining the dependency descriptor in IETF be part of the SFRAME WG,
or is this a normative dependency? Currently this is a industry forum header
extension not an IETF product. And what short commings of Frame Marking is it
addressing. 

 
Cheers

Magnus Westerlund 


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