From: Magnus Westerlund <magnus.westerlund@ericsson.com>
To: Bo Burman <bo.burman@ericsson.com>, "barryleiba@computer.org"
 <barryleiba@computer.org>
CC: "bernard.aboba@gmail.com" <bernard.aboba@gmail.com>,
 "draft-ietf-avtcore-multiplex-guidelines.all@ietf.org"
 <draft-ietf-avtcore-multiplex-guidelines.all@ietf.org>, "avt@ietf.org"
 <avt@ietf.org>
Thread-Topic: Moving draft-ietf-avtcore-multiplex-guidelines along
Thread-Index: AQHVaSOAPiVCMTzoDU+xzhTcn8adqacnzsjAgGvrjYCAAEf5oIAAARkAgBTNq4CAcj6zAIAArBSA
Date: Fri, 14 Feb 2020 14:57:24 +0000
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Subject: Re: [AVTCORE] Moving draft-ietf-avtcore-multiplex-guidelines along
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Hi,

Sorry, this has been down prioritized again by me. Will do my best to get i=
t
moving.

Cheers

Magnus

On Fri, 2020-02-14 at 04:41 +0000, Barry Leiba wrote:
> Hi... any progress on this?
>=20
> Barry
>=20
> On Tue, Dec 3, 2019 at 7:03 AM Bo Burman <bo.burman@ericsson.com> wrote:
> > Hi,
> >=20
> > I've started a (so far author-internal) draft -10 that tries to address
> > most=20
> > of Bernard's comments; in progress.
> >=20
> > I however didn't yet do a total re-haul to consider if use of MID/RID/R=
RID
> > is=20
> > sufficiently covered and described throughout the document. Help on=20
> > identifying potentially impacted text would be greatly appreciated, fro=
m my=20
> > co-authors as well as from the list.
> >=20
> > Regarding Bernard's comment to section 5.2:
> >=20
> > >  3.  For applications with dynamic usage of RTP streams, i.e.
> > >       frequently added and removed, having much of the state associat=
ed
> > >       with the RTP session rather than per individual SSRC can avoid
> > >       the need for in-session signalling of meta-information about ea=
ch
> >  >      SSRC.
> > >
> > > [BA] Not sure I grasp your point here.  If there are multiple SSRCs i=
n
> > the=20
> > > same RTP session, avoiding the need for in-session signaling typicall=
y=20
> > > requires:
> > >
> > > a. A mechanism for handling "unsignaled streams" (e.g. an Unhandled R=
TP=20
> > > event as in ORTC), OR
> > >
> > > b. Support for MID to allow routing to the correct RTP receiver witho=
ut=20
> > > in-session signaling of the SSRC.
> >=20
> > Firstly, I think the original text in bullet 3 doesn't consider use of
> > bundle=20
> > or MID but rather assumes the pre-bundle type of RTP session. Adding us=
e of=20
> > MID would be part of an RTP session state (e.g. mapping SSRC to an medi=
a=20
> > source, which would also map to an m=3D line if SDP is used) that doesn=
't=20
> > require in-session signaling. That would correspond to your alternative=
 b.
> >=20
> > Secondly, there could still be "unsignaled streams" handling, either wi=
thin=20
> > (using same) MID or when not using MID in the RTP session, where other =
RTP=20
> > session information can be used to allow proper handling of dynamically=
=20
> > occuring RTP streams, such as e.g. RTCP SDES CNAME to identify RTP stre=
ams=20
> > sent from the same endpoint (but not necessarily the same media source)=
.
> > What=20
> > type of RTP session information that is needed for proper RTP stream
> > handling=20
> > depends on, I must assume, application-dependent requirements. That wou=
ld=20
> > correspond to your alternative a.
> >=20
> > Bernard, you indicate "a OR b" above; should they be seen as mutually=
=20
> > exclusive or could they both apply in the way I indicate? Would adding =
a=20
> > clarification along the lines above address your concern?
> >=20
> > Cheers,
> > /Bo
> >=20
> > > -----Original Message-----
> > > From: Barry Leiba <barryleiba@computer.org>
> > > Sent: den 20 november 2019 07:22
> > > To: Magnus Westerlund <magnus.westerlund@ericsson.com>
> > > Cc: draft-ietf-avtcore-multiplex-guidelines.all@ietf.org; avt@ietf.or=
g
> > > Subject: Re: Moving draft-ietf-avtcore-multiplex-guidelines along
> > >
> > > Thanks; I'd love to move it forward.
> > >
> > > b
> > >
> > > On Wed, Nov 20, 2019 at 2:20 PM Magnus Westerlund
> > > <magnus.westerlund@ericsson.com> wrote:
> > > >
> > > > Hi Barry,
> > > >
> > > > Sorry, this has failed to get the necessary author time to take car=
e
> > > > of the comments. Will try to get it done soonish.
> > > >
> > > > Cheers
> > > >
> > > > Magnus Westerlund
> > > >
> > > >
--=20
Cheers

Magnus Westerlund=20


----------------------------------------------------------------------
Networks, Ericsson Research
----------------------------------------------------------------------
Ericsson AB                 | Phone  +46 10 7148287
Torshamnsgatan 23           | Mobile +46 73 0949079
SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com
----------------------------------------------------------------------



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