Re: [MMUSIC] Fwd: New Version Notification for draft-ietf-mmusic-msid-01.txt

On 08/14/2013 07:28 PM, Paul Kyzivat wrote:
> I have a fundamental question about this draft:
>
> With Unified Plan we have a unique m-line for every MediaStreamTrack.
> Given that, why do we need the msid attribute? Isn't it sufficient to
> define a new semantic ("mediastream"?) for the grouping framework?
> (RFC3388).
>
> There would still be need for a way to convey the application data,
> but that can be done via another attribute ("mediastream-data"?)
> associated with the m-line.

I wondered about that too.
We have two IDs to convey:

- The ID of the MediaStream. The grouping can be a new semantic for the
grouping framework, but the actual ID value has to be carried somewhere
- it has to be associated with the group, so it can't be a session-level
attribute.

- The ID of the MediaStreamTrack. Now that MediaStreamTracks correspond
to m-lines, it makes sense to carry this in a media-level attribute.

I'm sure we can design another scheme for carrying those IDs around.
But I do wonder what the positive value of restructuring this is.

>
>     Thanks,
>     Paul
>
> On 8/13/13 2:24 PM, Harald Alvestrand wrote:
>> The auto-poster doesn't seem to want to tell mmusic about this....
>>
>> this is updated according to Unified-plan. Since it was only 1 day
>> before the old version had expired, the proofreading might be a little
>> light - please point out places where I had missed changing "SSRC" to
>> "m-line"!
>>
>> I retained some description of the old mechanism (using a=ssrc) in an
>> appendix. Please state opinions on whether this should be retained as
>> informative, promoted to normative, or removed entirely in the next
>> version.
>>
>> Hope this informs!
>>
>>         Harald
>>
>>
>> -------- Original Message --------
>> Subject:     New Version Notification for draft-ietf-mmusic-msid-01.txt
>> Date:     Tue, 13 Aug 2013 05:13:42 -0700
>> From:     internet-drafts@ietf.org
>> To:     Harald T. Alvestrand <harald@alvestrand.no>, Harald Alvestrand
>> <harald@alvestrand.no>
>>
>>
>>
>> A new version of I-D, draft-ietf-mmusic-msid-01.txt
>> has been successfully submitted by Harald Alvestrand and posted to the
>> IETF repository.
>>
>> Filename:     draft-ietf-mmusic-msid
>> Revision:     01
>> Title:         Cross Session Stream Identification in the Session
>> Description Protocol
>> Creation date:     2013-08-13
>> Group:         mmusic
>> Number of pages: 14
>> URL:http://www.ietf.org/internet-drafts/draft-ietf-mmusic-msid-01.txt
>> Status:http://datatracker.ietf.org/doc/draft-ietf-mmusic-msid
>> Htmlized:http://tools.ietf.org/html/draft-ietf-mmusic-msid-01
>> Diff:http://www.ietf.org/rfcdiff?url2=draft-ietf-mmusic-msid-01
>>
>> Abstract:
>>     This document specifies a grouping mechanism for RTP media streams
>>     that can be used to specify relations between media streams.
>>
>>     This mechanism is used to signal the association between the SDP
>>     concept of "m-line" and the WebRTC concept of "MediaStream" /
>>     "MediaStreamTrack" using SDP signaling.
>>
>>     This document is a work item of the MMUSIC WG, whose discussion list
>>     ismmusic@ietf.org.
>>
>>
>>
>>
>>
>> Please note that it may take a couple of minutes from the time of
>> submission
>> until the htmlized version and diff are available at tools.ietf.org.
>>
>> The IETF Secretariat
>>
>>
>>
>>
>>
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>
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