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[MMUSIC] Change Alert [Re: Modifying an approved document: MSID]

Flemming Andreasen <fandreas@cisco.com> Thu, 26 January 2017 13:54 UTC

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To: Harald Alvestrand <harald@alvestrand.no>, mmusic@ietf.org
References: <24b5eee4-29b1-33b0-ecea-58c766636311@alvestrand.no> <50b49dbf-7de1-a7c4-923f-f702ac14215e@alvestrand.no> <0df3cbb0-a3e7-011c-c4d5-63aad9350283@alvestrand.no>
From: Flemming Andreasen <fandreas@cisco.com>
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Date: Thu, 26 Jan 2017 08:54:10 -0500
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Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>
Subject: [MMUSIC] Change Alert [Re: Modifying an approved document: MSID]
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Hi Harald

Since the document is not yet in Auth48 and the change is relatively 
minor, it is possible to update it during Auth48.

However, from an MMUSIC chair point of view, I would like to get 
positive confirmation from some of the stakeholders that this change is 
indeed desired. Similarly, if anybody has any concerns with the 
suggested change, please send an e-mail to that effect.

Thanks

-- Flemming (as MMUSIC co-chair)



On 1/23/17 10:18 AM, Harald Alvestrand wrote:
> Den 19. jan. 2017 13:31, skrev Harald Alvestrand:
>> Ted pointed out to me that I sent this to the wrong group.
>>
>> Chairs and members, please advise.
> My proposed change is here:
>
> https://github.com/alvestrand/rtcweb-msid/pull/16
>
> The filed issue is here:
>
> https://github.com/alvestrand/rtcweb-msid/issues/15
>
> (CCing RTCWEB - please keep discussion, if any, on mmusic)
>
>>
>>
>> -------- Forwarded Message --------
>> Subject: 	[rtcweb] Modifying an approved document: MSID
>> Date: 	Wed, 18 Jan 2017 23:22:14 +0100
>> From: 	Harald Alvestrand <harald@alvestrand.no>
>> To: 	rtcweb@ietf.org <rtcweb@ietf.org>
>>
>>
>>
>> When reviewing the implications of the PeerConnection API change to
>> support AddTrack rather than AddStream, I found an issue.
>>
>> This issue concerns draft-ietf-rtcweb-msid, which is currently in
>> REF-WAIT state (I believe).
>>
>> The issue is that it is possible to add a track without specifying a
>> stream. Since the track's ID needs to be carried, we have to send an
>> "a=msid" line, but the track's ID is the *second* field on that line,
>> with the first being the stream's ID.
>>
>> This creates a problem.
>>
>> Suggested fix: Insert two lines in the document:
>>
>> 1) On SDP generation:
>>
>> "If there is no stream associated with the track, use the reserved ID
>> value '-'"
>>
>> 2) On SDP parsing
>>
>> "If the stream ID is the reserved value '-', the track is not associated
>> with a stream, and no stream is signalled or created."
>>
>> If this is OK with the community, I'll issue an updated draft with this
>> change.
>>
>>
>> -- 
>> Surveillance is pervasive. Go Dark.
>>
>> _______________________________________________
>> rtcweb mailing list
>> rtcweb@ietf.org
>> https://www.ietf.org/mailman/listinfo/rtcweb
>>
>>
>>
>> _______________________________________________
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>> mmusic@ietf.org
>> https://www.ietf.org/mailman/listinfo/mmusic
>>
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