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Re: [Linphone-developers] Question about slide

From: Julien Chavanton
Subject: Re: [Linphone-developers] Question about slide
Date: Mon, 2 Dec 2013 13:02:01 +0100

I guess I am a little bit confused about the usage of slide, slide is
the "average packet transit time "

it does include latency and clock-slide, the dual purpose is sometimes
confusing me.

On Mon, Dec 2, 2013 at 12:14 PM, Julien Chavanton <address@hidden> wrote:
> Hi,
> I am trying to understand why the "slide" is fluctuating so much under
> significant jitter.
> Question 1: In the algorithm impemented in Linphone, the slide is
> trying to represent the difference between the sender time-stamp and
> the receiver timestamp (+latency) ?
>         "slide: an average of difference between the expected and the
> socket-received timestamp"
> Question 2: Instead of putting so much weight on the last packet = 1%,
> shouldn't we do a real average ?
> Question 2.2: Or why not taking the lowest value observed in "diff"
> between local and sender TS ? (We do not trust to remote clocking ?)
> Question 3: Reading :
>         "slide is used to make clock-slide detection and correction."
> Do we suspect remote phone will change it's clocking source and jump
> in the futur or the past and this is why we can not trust it ?
> thank you
> Julien

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