Re: [MMUSIC] POF/PAN: SDP group attribute in a POF/PAN?

[Suhas Nandakumar <[e-mail]>]

On Mon, Oct 21, 2013 at 3:47 PM, Adam Roach <[e-mail]> wrote:

>  On 10/21/13 17:38, Suhas Nandakumar wrote:
>
>
>
>
> On Mon, Oct 21, 2013 at 3:29 PM, Paul Kyzivat <[e-mail]>wrote:
>
>> On 10/21/13 5:53 PM, John Leslie wrote:
>>
>>> Paul Kyzivat <[e-mail]> wrote:
>>>
>>>>
>>>> There remains the problem of indicating *which* (if any) group a newly
>>>> added m-line joins.
>>>>
>>>
>>>     Not only don't I see an _answer_ to this -- I don't even think we
>>> have
>>> a common understanding of the _question_.
>>>
>>>     :^(
>>>
>>
>>  Here is an example:
>>
>> a=group:bundle A B
>> a=group:bundle C D
>> m=audio ...
>> a=mid:A
>> m=audio ...
>> a=mid:B
>> m=video ...
>> m=mid:C
>> m=video ...
>> a=mid:D
>>
>> Then we do a POF
>>
>> m=video ...
>> a=mid:E
>>
>> We want to add this to the 2nd bundle. How do we say that?
>> I'm suggesting:
>>
>> m=video ...
>> a=mid:E
>> a=groupref:bundle C
>>
>> The only a=group that matches that is the second one, so this implicitly
>> updates that one to:
>>
>> a=group:bundle C D E
>>
>> Make sense? Its all a hack of course. But everything that is done to SDP
>> is a hack.
>>
>
>  I think even this case can break if you use FEC based grouping mechanism
>
>  a=group:FEC-XR a b c
> a=group:FEC-XR a d
>
>  now if we want to add the new "mid e" to the list where i have mid a
> listed , we end up at the same point.
>
>  How about  we can extend groupref to include the entire group line as
> below
>
> m=video ...
> a=mid:E
> a=groupref:FEC-XR a d
>
>  ==> this would end up as
>  a=group:FEC-XR a b c
> a=group:FEC-XR a d e   // new one added to the right line
>
>
>
>
> This is giving me a strong sense of deja vu.
>
> http://www.ietf.org/mail-archive/web/mmusic/current/msg12427.html
>
>
Completely agreed. It is the same solution.

/a
>