[Ekiga-list] Poor audio quality

[yannick]

Hi

Le dimanche 12 novembre 2006 à 16:25 +0000, Mario Rossi a écrit :
> Hi
> 
> I've finally installed ekiga 2.0.3 (compiled from sources) and I've
> done some testing using the dmix plugin.

http://wiki.ekiga.org/index.php/Getting_several_applications_using_the_sound_card_at_the_same_time_%3F as a start.

Regards,
Yannick

> 
> During the tests I've used no webcam (so to avoid any overload of the
> system) and tried the echo server of ekiga.
> 
> Using the direct alsa output, jitter buffer goes at 20 and the quality
> is very good. In my tests sometimes it increases to 40, most of the
> times stays at 20.
> 
> Using the "default" (i.e. dmix) the quality is bad while the jitter
> buffer increases.
> In the worst cases it keeps increasing till 500 (very fast), other
> times it slowly increases, sometimes it stabilises at around 300.
> Usually (but not always) the quality improves when the jitter stops.
> 
> If there is an other application playing sond, the growth of the
> jitter to 500 is usually faster.
> 
> Sorry about my ignorance, but what is the jitter buffer? How does it
> interact with dmix and alsa?
> 
> I've found that using the sound event settings I can have the "ring"
> with dmix and then before answering I have to stop other applications
> playing sound, so in my case the limitation of dmix is not really that
> big, but anyway...
> 
> Thanks
> 
> >>
> >> If I use the hardware directly the quality improves but I still have
> >> some problems when I set the full screen.
> >>
> >> Is there any setting that could affect audio quality?
> >>
> 
> >If it happens when you set to fullscreen, you are probably using too
> >much CPU ressources.
> 
> >Be careful also that you are perhaps wasting your bandwidth with too
> >large video transmission or too high settings.
> 
> >Just check the value of your jitter, it will help a lot to determine if
> >there is a problem related to CPU/Bandwidth (if it goes over 500ms, then
> >the problem is at this side, if not, then the problem is on the ALSA
> >side).
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