Re: [rtcweb] How to multiplex between peers

[Colin Perkins <[e-mail]>]

On 20 Jul 2011, at 23:38, Matthew Kaufman wrote:
> On 7/20/2011 3:31 PM, Colin Perkins wrote:
>> On 20 Jul 2011, at 22:15, Aron Rosenberg wrote:
>>> Another +1 for multiplexing everything together. My only worry is that the base spec for RTCP doesn't mandate that SSRC is included in every RTCP message type, and thus you could end up with the multiplexing layer needing to understand every  RTCP messaged used for video (TMMBR, TMMBN, etc)
>> 
>> ...which is another reason why this doesn't work in all cases, in addition to the reasons we document in draft-perkins-rtcweb-rtp-usage-02
>> 
> 
> So let me get this straight... RTP and RTCP is broken and inflexible and therefore we must use it, and use it in the broken and inflexible way?
> 
> If anything this is an argument for ignoring RTP and RTCP and doing something entirely new that is actually appropriate for what we're trying to build, not living with crap just because there's an RFC for it.


You're free to re-invent that wheel, if you wish. However, if you want to use RTP for RTCWeb, then you need to accept that doing so has both some advantages and some disadvantages. One of those disadvantages, for this application domain, is that it requires an explicit demultiplexing layer for distinct RTP sessions. Whether that demultiplexing layer is UDP, or some yet-to-be defined shim layer is a question for this working group, but something is needed if RTP is used.

-- 
Colin Perkins
http://csperkins.org/