Re: [AVT] time alignment capability

[Colin Perkins <csp at csperkins.org>]

On 2 Mar 2006, at 21:46, Herlein Greg wrote:
> > There is also a class of applications (largely but not exclusively  
> > of "professional" type) which do not tolerate such artifacts well  
> > and would benefit
> > from additional features supporting phase synchronization of  
> > sources and receivers.
>
> I concur completely.  I posted a few months ago about this topic  
> asking for state of the art.  Our application involves multiple  
> receivers that are on the same VLAN and are receiving the same  
> multicast transmission - but viewers can see (and more importantly,  
> hear!) from more than one end point at once.  If those end points  
> get out of sync - even by a small amount - the viewer experience is  
> less than satisfactory (echo effect mostly).

I assume you've seen J. Escobar, C. Partridge and D. Deutsch, Flow  
Synchronization Protocol, IEEE/ACM Transactions on Networking, Volume  
2, Number 2, April 1994?

> We'd like to see a standards-based solution to this problem.  I've  
> been closely following the SMPTE time code approach in hopes it  
> would lead the way to a solution.
>
> What can I do to help this effort along?

Write an internet-draft outlining the problem you need to solve, and  
explaining why it can't be solved using existing standards. Show you  
have a community willing to work on solving the problem.  Then talk  
to the working group chairs and/or area directors, and we'll figure  
out how to charter the work so it can get published.

Colin

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