[Telepathy] change speexenc settings for empathy

[Olivier Crête]

On Fri, 2011-04-08 at 17:57 +0200, Alexey Fisher wrote:
> Hi
> Am Freitag, den 08.04.2011, 11:42 -0400 schrieb Olivier Crête:
> > > dtx=1
> > > # do not send any packets on silence
> > > # see Bug https://bugzilla.gnome.org/show_bug.cgi?id=646474
> > 
> > This gives you the impression that the bitrate is lower because you
> > don't send why not speaking. But it doesn't change the maximum bitrate
> > (when speaking) which is all that really matters for quality..
> >
> > It will also break if WMM is enabled, in that case, the wireless router
> > only sends out frames when it receives one, so you have to send
> > continuously to keep on receiving.
> 
> My fault in description. It send about 2 packets/sec to keep connection.

That's not enough.. You won't get incoming packets unless you send
outgoing packets.. so if you send 2 packets per second, it means you
only get incoming packets twice per second, which will destroy your
audio.

Unless someone tells me there is a reliable way to temporarily disable
WMM from an application, DTX is not usable with WiFi networks.

> > > nframes=4
> > > # allow better compression and bigger packet size. It reduce network
> > > # traffic to 13 packets/sec. (with default options ~50 packets/sec).
> > > # the value bigger than 4 will introduce stuttering. 
> > 
> > This will increase latency, but should definitely improve compression.
> > But it gives less leeway to the jitterbuffer to do its thing. Maybe we
> > can increase to 2 which is already 40ms.. 4 is 80ms which is way too
> > much (the default jb is 100ms in Empathy).
> 
> I'll try it.
> 
> Are there any way to change the settings for empathy? I tryed to add
> speexenc in element-properties file, but it looks like without any
> effect.

That should be all.

-- 
Olivier Crête
olivier.crete at collabora.co.uk
Collabora Ltd
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