Re: [Linphone-users] Possibilities for smaller jitter buffer?

[Simon Morlat]

Hi,
>
> 1. Is it possible to extend the possible range towards smaller values, e.g.
> having 5 ms or 10 ms as the smallest possible buffer size?
There are good reasons for not going under 10ms:
* The OS resolution is usually 10 ms, except with some linux-2.6
* The size of RTP packets is usually 20 (the default value), however it can be 
lowered with the drawback of increasing bandwidth because of overhead of 
ip/udp/rtp headers.
* the soundcards/drivers of our pc have usually bigger latencies (up to 1 
second in the worse case), and around 32 ms with the best drivers (though it 
can be possible to lower it again).
>
> 2. Is it possible for me to manipulate some source file in linphone-1.2.0
> to give this a quick try, or would this change require changes in many
> parts of the source?
>
> I think it would improve the speech quality if the jitter buffer could be
> smaller. Right now I experience an audible delay in the receive direction.
> (But this can of course have other reasons as well).

Yes I think it's better to know where the delay comes from before lowering 
values somewhere that are not related with the delay you observe.
I don't remember if I asked you a complete call log (linphone --verbose). If 
not, please send to me.

Simon

>
> I know that in for example X-Lite (popular SIP UA for Windows) it is
> possible to set the jitter buffer to 10 ms as a minimum value.
>
> Best regards,
>
> Lasse
>
>
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