Re: [AVTCORE] Comments on draft-ietf-avtcore-monarch-04
Magnus Westerlund <magnus.westerlund@ericsson.com> Fri, 04 November 2011 10:02 UTC
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Date: Fri, 04 Nov 2011 11:01:56 +0100
From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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To: Qin Wu <bill.wu@huawei.com>
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Cc: IETF AVTCore WG <avt@ietf.org>, "draft-ietf-avtcore-monarch@tools.ietf.org" <draft-ietf-avtcore-monarch@tools.ietf.org>
Subject: Re: [AVTCORE] Comments on draft-ietf-avtcore-monarch-04
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On 2011-11-04 03:13, Qin Wu wrote: > ----- Original Message ----- > From: "Magnus Westerlund" <magnus.westerlund@ericsson.com> > To: "Qin Wu" <bill.wu@huawei.com> > Cc: "IETF AVTCore WG" <avt@ietf.org>; <draft-ietf-avtcore-monarch@tools.ietf.org> > Sent: Thursday, November 03, 2011 9:48 PM > Subject: Re: [AVTCORE] Comments on draft-ietf-avtcore-monarch-04 > > >> Hi, >> >> Removing all issues that don't need additional discussion or commenting. >> >> >> >> On 2011-10-25 07:45, Qin Wu wrote: >>> >>> 9. Section 4: >>> "It is also >>> fixed across multiple RTP sessions from the same source." >>> >>> I interpret "source" in the above as an end-point or RTP node. Which >>> causes me to have the following comment. >>> >>> This is very commonly true, but not universally true. As CNAME >>> identifies a synchronziation context, a given end-point could have media >>> sources that belong to multiple synchronization contexts in the same >>> session. For example have microphones and cameras from multiple rooms, >>> where each room will be its own synchronization context. >>> >>> >>> >>> [Qin]: Agree with your thinking, but here what we emphasize is "across multiple RTP session" >>> >>> Does this really conflict with what you said? >>> >>> Anyway I will reword this in the new vesion. >>> > >> No, as long as we consider source as media recording device(s) in a >> given synchronization context they will be fixed across multiple sessions. >> > > > [Qin]: Okay, do we have other use cases besides the above one you gave? Not from the top of my head. >>> >>> 21. Section 7.1: >>> >>> Strictly the RTP end >>> system can only conclude that its RTP has been lost in the network, >>> though an RTP end system complying with the robustness principle of >>> [RFC1122] should survive with essential functions unimpaired. >>> >>> What is the purpose with this sentence? And what is actually seen as >>> "essential functions"? >>> >>> >>> >>> [Qin]: I think essential functions are referred to as "media distribution" >> >> So you mean that a robustly built end-point will still be able to send >> its media despite the fact that media it should receive has been lost in >> between the sender and this receiver? > > [Qin]: That's my understanding, is that okay with you? Yes. > >>> >>> 23. Section 8. I agree that this draft shouldn't have a IANA >>> Consideration other to say that it is has no actions. However, I think >>> the document should consider if it has some guidance on IANA actions for >>> the monitoring architecture. Some part of this is clearly about the >>> consumption of XR block code points that isn't a major issue. And if we >>> do run out a second RTCP packet type for XR block 2 could be assigned. >>> >>> >>> >>> [Qin]: The WG consensus is space depletion is not issue >>> >>> if you really want space expansion, you can define one XR block type >>> >>> for vendor-specific extensions, with an enterprise number included >>> >>> to identify the vendor making the extension. So I prefer to say >>> >>> "There is no IANA action in this document" >> >> Yes, but if that is the conclusion, shouldn't we document it? > > [Qin]: Okay, I can put them in the new version. Great Cheers Magnus Westerlund ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ----------------------------------------------------------------------
- [AVTCORE] Comments on draft-ietf-avtcore-monarch-… 曹宁
- Re: [AVTCORE] Comments on draft-ietf-avtcore-mona… Qin Wu
- [AVTCORE] Comments on draft-ietf-avtcore-monarch-… Magnus Westerlund
- Re: [AVTCORE] Comments on draft-ietf-avtcore-mona… Qin Wu
- Re: [AVTCORE] Comments on draft-ietf-avtcore-mona… Qin Wu
- Re: [AVTCORE] Comments on draft-ietf-avtcore-mona… Magnus Westerlund
- Re: [AVTCORE] Comments on draft-ietf-avtcore-mona… Qin Wu
- Re: [AVTCORE] Comments on draft-ietf-avtcore-mona… Magnus Westerlund