Re: [MMUSIC] M-lines: Wikifying it

Christer Holmberg <> Mon, 03 December 2012 17:18 UTC

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From: Christer Holmberg <>
To: 'Harald Alvestrand' <>
Thread-Topic: [MMUSIC] M-lines: Wikifying it
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Date: Mon, 03 Dec 2012 17:18:46 +0000
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Subject: Re: [MMUSIC] M-lines: Wikifying it
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>>>>>>>> So, the exercise is NOT about how to apply attributes to individual sources?
>>>>>>> Only in the sense that it is about figuring out which attributes need to be applied to individual sources.
>>>>>> Well, I believe that was my original question :)
>>>>>> If you want to apply an attribute to an individual source, you must use the ssrc attribute.
>>>>> If you are in the camp that believes that there should be more than oneindependent source per M-line.
>>>>> That camp seemed to me to be in the minority in Atlanta; it was absolutely not the consensus opinion.
>>>> It's not about in which camp someone is, it's about the assumptions we make in the wiki study. If the assumption is one source per m- line, than I think it should be explicitly stated.
>>>> Trying again, since I'm obviously not making myself clear:
>>> The two alternative approaches are:
>>> - Everything that needs to be controlled separately is in its own M-line. Everything that needs to go on the same RTP session uses BUNDLE to get there. Transport parameters get figured out somehow.
>>> - Everything that goes on the same RTP session goes on the same M-line.
>>> Due to backwards compatible SDP, we may choose to use BUNDLE to lump video and audio together - or we may choose MMT if that works for people. Anything that needs separate control uses a=ssrc.
>> Exactly!
>> So, which (if any) approach do you assume in the wiki? :)
> For the 5th time: I'm NOT assuming one or the other approach.
> I'm trying to gather information that people can use to decide which approach to follow.
> That REQUIRES that the wiki does NOT assume one approach.
> Do you hear me now?

So, coming back to my original question: For "F", a *stream* refers to an individual source (and is not related to whether one m- line will or will not contain multiple sources). Correct?