Re: [AVTCORE] I-D Action: draft-ietf-avtcore-multiplex-guidelines-12.txt

Magnus Westerlund <magnus.westerlund@ericsson.com> Wed, 24 June 2020 12:42 UTC

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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
To: "gunnar.hellstrom@ghaccess.se" <gunnar.hellstrom@ghaccess.se>, "magnus.westerlund=40ericsson.com@dmarc.ietf.org" <magnus.westerlund=40ericsson.com@dmarc.ietf.org>, "avt@ietf.org" <avt@ietf.org>
Thread-Topic: [AVTCORE] I-D Action: draft-ietf-avtcore-multiplex-guidelines-12.txt
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Date: Wed, 24 Jun 2020 12:42:10 +0000
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Subject: Re: [AVTCORE] I-D Action: draft-ietf-avtcore-multiplex-guidelines-12.txt
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Hi,

For your knowledge I didn't manage to get the edits into a draft that got
submitted prior to the IESG approval. I have sent the suggested edits to the
RFC-editor so they will be considered in the editing process. 

Cheers

Magnus

On Mon, 2020-06-22 at 14:05 +0000, Magnus Westerlund wrote:
> Hi Gunnar,
>  
> Thanks for the feedback.
>  
> From: Gunnar Hellström <gunnar.hellstrom@ghaccess.se> 
> Sent: den 20 juni 2020 11:38
> To: Magnus Westerlund <magnus.westerlund@ericsson.com>om>; avt@ietf.org
> Subject: Re: [AVTCORE] I-D Action: draft-ietf-avtcore-multiplex-guidelines-
> 12.txt
>  
> Hi,
> Thanks for an inspiring draft.
> I have two issues:
> 1.) In section 3.4.2 it is said:
> "RTP Considerations for Endpoints Sending Multiple Media Streams" [RFC8108].
> I first got the impression that this would refer to a section in RFC 8108, but
> there is none with that title.
> And it is also not the title of RFC 8108. I suggest that you update the string
> to what it was intended to refer to.
> [MW] Yes, the title should really be changed. I am not certain I understand
> the first part. This whole document do discuss and clarify how to handle the
> aspects that are raised. So I tried to clarify that “These” really refer to
> aspects and not anything else. Updated paragraph below.
> Using multiple SSRCs at one endpoint in an RTP session requires resolving some
> unclear aspects of the RTP specification. These aspects could           
> potentially lead to some interoperability issues as well as some  potential
> significant inefficiencies, as further discussed in “Sending Multiple RTP
> Streams in a Single RTP Session" [RFC8108]. An RTP application designer should
> consider these issues and the possible application impact from lack
> of            appropriate RTP handling or optimization in the peer endpoints.
>  
>  
> 2.) I see a contradiction between two statements:
> ------------------------------------------------------------------------------
> --
> I.) In 3.4 you say:    "Using multiple RTP streams is a well-supported feature
> of RTP."
> II.) In 5.2, 4.b you mention a disadvantage with using multiple streams for
> the same media type in one RTP session:
> "b. There is some potential for concern with legacy implementations that don't
> support the RTP specification fully when it comes to handling multiple SSRC
> per endpoint."
> ------------------------------------------------------------------------------
> -------------
> Can you in some way tell for which cases there is concern and for which it is
> a well-supported feature.
> My interest is for the multi-party-rtt drafts, where we have so far avoided
> the solution with multiple media streams of one media type in a single RTP
> session saying that there may be lack of support for it in current RTP stacks.
> Our current choice to instead have a mixer combine all streams into one stream
> has some disadvantages and does not seem to be your recommendation.
> [MW] So the 3.4 is related to the RTP protocols capabilities as specification.
> The second aspect is related to system employing RTP and what capabilities
> they have required and can be expected to support.
>  
> Cheers
> Magnus Westerlund
> _______________________________________________
> Audio/Video Transport Core Maintenance
> avt@ietf.org
> https://www.ietf.org/mailman/listinfo/avt
-- 
Cheers

Magnus Westerlund 


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