Re: [AVT] alignment of layers issue

[Colin Perkins <csp at csperkins.org>]

On 21 Nov 2008, at 16:48, Franceschini Guido wrote:
> Hi all,
>
> I can present myself as a co-implementer of an RTP/RTCP suite.
> I do use RTCP, base my lip-sync on RTCP and have no troubles with it.
> However, when I generate RTCP reports my wallclock-RTPTS mapping is  
> not exact, but suffers from the imprecision of the getTimeXXX  
> functions.
> Similarly, when I examine the RTCP reports I receive from other  
> sources, I notice similar issues.
> Such imprecision is a don't care for lip-sync.
> But it becomes a must care for the layering stuff.
> This is a key difference that, by the way, invalidates my current  
> RTCP implementation (and I guess many others).

I understand that clock skew is an issue for some naive  
implementations that don't measure clock skew and compensate, but  
it's not clear what you mean by the "imprecision" of the getTimeXXX  
functions?

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



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