[pulseaudio-discuss] rtp-send questions

[Matthew Patterson]

Otherwise wouldn't you have problems maintaining sync and buffering on 
the network? "Muted" just means silent PCM audio, not that no audio 
flows. One could probably implement "silence compression" such that a 
minimal timing stream flowed during mute periods, but that sounds like a 
lower priority issue, and they tend to get cut :)

Matt



Jim Duda wrote:
> 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
>>     
>
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