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[Rmt] 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
----------------------------------------------------------------------
Ericsson AB                | Phone +46 8 4048287
Torshamsgatan 23           | Fax   +46 8 7575550
S-164 80 Stockholm, Sweden | mailto: magnus.westerlund at ericsson.com

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