RE: [dccp] Re: [AVT] Would DCCP kill Internet real-time media dis tribution?

I think this proves my point.
>I have never heard/seen a codec that can dynamically, in real time,
>vary its rate in response to network conditions in a way that
>is not objectionable to the user.

This product cannot dynamically vary its rate in response to network
conditions.  It appears to vary rates of multiple streams to keep
the aggregate within a fixed rate, which indeed, as you say, may
portend the possibility of dynamically varying the rate in response
to network conditions.  The algorithm, as described, probably is
not suitable for interactive streams, because of delay considerations,
as I suggested might be a concern.

If we had a reasonable amount of experience using techniques such as
this one in real networks, then I might have to change my opinion.
As it stands, this is pretty far from what I would need to
change our product, or to get me to believe that any substantial
part of the VoIP market would deploy such algorithms any time soon.
If you and Eddie want to keep slogging on DCCP for this kind of
codec, please continue, but I'm still in the skeptical stage.

Brian 

> -----Original Message-----
> From: philippe.gentric@philips.com 
> [mailto:philippe.gentric@philips.com]
> Sent: Thursday, December 04, 2003 4:58 AM
> To: Rosen, Brian
> Cc: avt@ietf.org
> Subject: RE: [dccp] Re: [AVT] Would DCCP kill Internet real-time media
> dis tribution?
> 
> 
> 
> Rosan you wrote:
> 
> >I'm dimly aware of what Philippe is talking about, but I don't
> >think it does what the first paragraph above describes today.
> 
> have a look at things like:
> 
> http://www.nextream-online.com/nextream/documents/pdf/WP%20FLE
XTREAM.pdf

the type of rate change these things do is pretty flexible, they actually
change the rate
several times *inside one video frame*  and the range of changes can be
pretty large.
quality is "tunable" and .... well just switch on your TV and look !

regards,

Philippe Gentric
Chief Architect
Philips Software
philippe.gentric@philips.com
http://www.software.philips.com

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