Re: [rtcweb] Plan A, respun

[Adam Roach <[e-mail]>]

On 5/8/13 06:00, Harald Alvestrand wrote:
> To put a blunt point on it: Either send less than ~32 streams, or give 
> a=ssrc attributes.

Let's call it 96, just to keep reality involved in the conversation (cf. 
RFC 3551, section 3, para 7; as updated by RFC 5761, section 4, para 10).

I'll also point out that you can always have more than one bundle; so, 
if you're willing to burn two ports rather than just one, you can double 
this to 192. Repeat as necessary.

> To me, that measn we're mandating one mechanism (PT values) for small 
> numbers of flows...

Uh... no? Small numbers of flows can use a=ssrc. They just lose some 
flexibility by doing so.

> ...and another mechanism (a=ssrc) for large numbers of flows - such 
> mechanism changes usually have "interesting" properties in what 
> happens at the changeover point.

Given the actual limit here is 96 *per* *port*, I'd be more inclined to 
characterize it as:

  * One very flexible mechanism for small, medium, and moderately large
    numbers of streams, and
  * Another less flexible mechanism for sessions of arbitrary size,
    including small numbers of streams


/a