Re: [MMUSIC] FW: New Version Notification - draft-mehta-rmt-flute-sdp-04.txt

Joerg Ott wrote:
> Hi Magnus,
> 
> if I am getting this right, nothing in our mail contradicts the
> m=/c= line approach for layered coding I mentioned below.  This
> would also address your uneasiness about the media attributes
> inherited from the first m= line since there will only be one.
> 

I don't think that using the / approach to layering is the right one. 
More and more SDP attributes apply to a single session and not a layered 
one. Consider for example the key management for SRTP. These applies to 
a single stream and does not work for multiple streams.

Thus I think using a structure with a grouping attribute is the way 
forward. Or actually the right way would be to abandon SDP totally and 
get a description format that actually can describe things properly with 
complex relations. But I guess we will continue to hack SDP for this.

But I do support your statement that we shouldn't change the default 
meaning of media line being a individual stream. And I don't see an 
issue of changing this for the FLUTE SDP draft. But more about this in a 
response to Rod's email.

Cheers

Magnus Westerlund

Multimedia Technologies, Ericsson Research EAB/TVA/A
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