[Telepathy] change speexenc settings for empathy

[Alexey Fisher]

Am Samstag, den 09.04.2011, 10:05 +0200 schrieb Alexey Fisher:
> Am Freitag, den 08.04.2011, 21:57 +0200 schrieb Alexey Fisher:
> > Am Freitag, den 08.04.2011, 12:16 -0400 schrieb 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.
> > 
> > Hmm, i'm confused.
> > if i understand correctly, the behavior like: 2 packets send / 2 packets
> > receive can be caused by firewall.
> 
> I digget i bit deeper in the firwall issue. It called "NAT traversal" or
> "UDP hole punching". TO keep the hole in firewall/nat we need only send
> empty udp packet.
> 
> So this will still reduce the traffic, but also keep as possible to keep
> connection open. This is mach better then doing that what we do now.
> 
> So the scenario is like this:
> 1) speex recognize silence and setting GAP flag on the packet
> 2) current rtp, by default, will not send packets with GAP
>  so it should be changed to produce keep alive packet or some thing
> similar
> 3) we do not need to pack empty rtp packet in udp. We can just send
> empty udp. So UDP should some how be noticed about it.

Thank you for pointing me this dtx issue. i made it as bug report here
https://bugzilla.gnome.org/show_bug.cgi?id=647252

-- 
Regards,
        Alexey