Re: [MMUSIC] Wisdom sought: Prioritization of codecs

[Adam Roach <[e-mail]>]

On 11/15/12 10:57, Paul Kyzivat wrote:
> The whole notion of codec preference breaks down even more for 
> multiplexed streams. You may very explicitly prefer/require different 
> streams to use different codecs.
>
> So I don't think we can rely too much on parsing the existing text for 
> guidance on how to use SDP to represent multiplexed sessions. (Unless 
> of course we use bundle, with a separate m-line for each stream.) 
> AFAIK we are breaking new ground here.

This kind of "we fixed this problem once and get to fix it all over 
again" issue is exactly the kind of thing I was speaking to at the 
microphone in MMUSIC in Atlanta. The further we drift from the 
established semantics of SDP, the less applicable previously developed 
mechanisms become. Bundle and similar approaches that maintain one m= 
line per stream allow us to leverage 14 years of extensions and 
clarifications. If we decide to split from that (rather fundamental, 
IMHO) characteristic of SDP, we are effectively forking the protocol, 
and throwing away years of prior work.

/a