[pulseaudio-discuss] rtp-send questions

[Jim Duda]

I think I understand #2.  I believe all behave the same, the fact that I 
have multiple systems sending RTP was causing confusion.

The only real question is:

Is is unreasonable to expect the RTP traffic to be silent when an RTP 
source is muted?

Jim

Jim Duda wrote:
> I have 4 linux machines on my local network using pulse audio.
> All of which are running pulseaudio 0.9.8.
> 
> Each has rtp-send and rtp-recv installed.
> By default, each rtp-send is muted.
> 
> Question #1:  rtp-send mute
> 
> When rtp-send is muted, I expect that no rtp traffic will be sent.
> Is this a correct assumption?
> 
> This doesn't appear true, and I am surprised by this.   I have one 
> machine with a combined-sink, with one out being rtp-send.  When playing 
> any audio to this combined-sink, I get a constant stream of network 
> bandwidth on the order of 192K bytes/second.  When I stop the audio, the 
> network bandwidth goes down into the noise level.
> 
> The default.pa for this machine is:
> 
> This machine is a server which runs with --system mode.
> 
> load-sample-lazy pulse-hotplug /usr/share/sounds/startup3.wav
> load-module module-hal-detect
> load-module module-cli-protocol-tcp
> load-module module-http-protocol-tcp
> load-module module-esound-protocol-unix
> load-module module-native-protocol-unix auth-anonymous=1
> load-module module-native-protocol-tcp auth-anonymous=1
> load-module module-zeroconf-publish
> load-module module-null-sink sink_name=sphinx_record description="Sphinx 
> Recording Source"
> load-module module-null-sink sink_name=sphinx_playback 
> description="Sphinx Playback Source"
> load-module module-rtp-recv
> load-module module-null-sink sink_name=rtp format=s16le channels=2 
> rate=44100 description="RTP Multicast Sink"
> load-module module-rtp-send source=rtp.monitor
> load-module module-combine sink_name=combined 
> master=alsa_output.pci_1274_5880_alsa_playback_0 
> slaves=alsa_output.pci_8086_24d5_alsa_playback_0,rtp,sphinx_playback
> load-module module-volume-restore
> load-module module-default-device-restore
> load-module module-rescue-streams
> load-module module-suspend-on-idle
> load-module module-gconf
> set-default-sink combined
> set-default-source alsa_input.pci_1274_5880_alsa_capture_0
> set-sink-mute rtp 1
> 
> Question #2: one machine acts different
> 
> One machine appears to be sending rtp traffic when rtp-send is 
> included., even when no audio is playing.  When this one machine has 
> rtp-send installed, and muted, and no audio is plaing, I see a constant 
> stream of network traffic on the order of 192K bytes/second.
> 
> This machine is a standard desktop which doesn't run with --system
> 
> What could be causing this condition, independent of question #1 above?
> 
> I have confirmed that no streams are playing on this machine, but yet, I 
> see the 192K bytes of traffic.  The traffic comes and goes as a function 
> of including rtp-send on this machine.
> 
> The default.pa for this machine is:
> 
> load-sample-lazy pulse-hotplug /usr/share/sounds/startup3.wav
> load-module module-hal-detect
> load-module module-esound-protocol-unix
> load-module module-native-protocol-unix auth-anonymous=1
> load-module module-native-protocol-tcp auth-anonymous=1
> load-module module-http-protocol-tcp
> load-module module-zeroconf-publish
> load-module module-null-sink sink_name=rtp format=s16le channels=2 
> rate=44100 description="RTP Multicast Sink"
> load-module module-rtp-send source=rtp.monitor
> load-module module-rtp-recv
> load-module module-volume-restore
> load-module module-default-device-restore
> load-module module-rescue-streams
> load-module module-suspend-on-idle
> load-module module-x11-publish
> load-module module-gconf
> set-sink-mute rtp 1
> 
> Thanks for any insight.
> 
> Jim