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Re: [MMUSIC] New Version Notification for draft-abhishek-mmusic-superimposition-grouping-00.txt(Internet mail)

Christer Holmberg <christer.holmberg@ericsson.com> Tue, 19 January 2021 18:45 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, "rabhishek(RohitAbhishek)" <rabhishek@tencent.com>, "mmusic@ietf.org" <mmusic@ietf.org>
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Date: Tue, 19 Jan 2021 18:45:00 +0000
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Subject: Re: [MMUSIC] New Version Notification for draft-abhishek-mmusic-superimposition-grouping-00.txt(Internet mail)
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Hi,

...
 
>> *Rohit: The ordering mechanism will be needed. Suppose we have a 
>> background X with transparency=100, and a superimposed media A with 
>> transparency=50. A over X would mean that X would visible partially 
>> through A, however X over A would mean that A wouldn't show through 
>> X.*
>
> If the ordering is needed, then you need to specify how it is determined. IMO it is permissible to use the order of values in the
> a=group: line to specify this ordering. (RFC5888 doesn't ascribe any semantics to this ordering of values, but neither does it forbid assigning meaning for particular grouping semantics.)
> I am not certain if Christer agrees with me on this point. 

In BUNDLE we define semantics for the ordering of the values, by saying that the first value in the attribute line represents the so called "tagged m- line". The order of the other values have no semantics, though.

> The alternative is to use a new attribute in the grouped media descriptions for this purpose. 

Correct. If we anyway are going to need at least two values (order and value), one option is to put them in the same attribute.

Regards,

Christer

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