On 14.06.2015 18:54, Nick wrote: > Greetings PulseAudio folks: > > I'm trying to pipe audio between an amateur radio (basically a USB sound > card) hooked to a Raspberry Pi and my laptop over a local network. I've > built PulseAudio 6 on a Raspberry Pi B+ and set up module-tunnel-sink > and module-tunnel-source, and that's all functioning. I can record audio > on my laptop and it seems to work well. However, I need to be able to > monitor the sounds coming out of the radio live, so I set up a > module-loopback with the source set to the USB sound card on the RPi. > > Here are the relevant bits in my system.pa config file: > > load-module module-tunnel-sink server=laptop sink_name=xps rate=11025 > load-module module-tunnel-source server=laptop source_name=xpss rate=11025 > load-module module-loopback > source=TI_USB_Audio_CODEC-00-CODEC.analog-stereo latency_msec=100 rate=11025 > > I've downsampled because I'm trying to minimize bandwidth and don't need > hi-fi audio (after all, it's a ham radio). This works, but only for a > few minutes. Then, the audio from the loopback becomes choppy and > eventually fades out completely. It sits silently for about a minute > (sometimes more) and then comes back in full quality. A minute or so > later, the process repeats. > > Some interesting tidbits: > 1) Only the loopback fades. If I'm recording in an application on the > laptop from the networked tunnel source directly, it holds the signal > nicely the whole time (even during the fadeouts). > 2) If I connect to my local network over a VPN, the loopback fading does > not occur at all. > 3) The fading happens both on wifi connections and on hard-wired ones. > 4) If I change the target of the loopback in pavucontrol's Playback tab > to something else and then back to my laptop speakers, it often stops a > fadeout and comes back strong for a minute or so (and then fades out > again). > 5) The fading occurs both with the downsampled rate set on the loopback > and with the default. > 6) This happens on multiple remix methods, including the default and > trivial. > 7) This happens on both the Raspberry Pi B+ and on the Raspberry Pi 2. > CPU on the RPi2 is at about 20%. > 8) The client (my laptop) has PulseAudio 4.0, not 6.0 like the server. > > I've uploaded a recording of the fading phenomenon that you can listen > to here: http://partofthething.com/upload/pulseaudio-fadeout.mp3 > > I'm not sure what to do to continue debugging. Any suggestions? > > Best regards, > -Nick > _______________________________________________ > pulseaudio-discuss mailing list > pulseaudio-discuss at lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss Hello Nick, can you send some debug output from your pulseaudio session? It might help to identify the problem. module-loopback should provide a state update each adjust_time. Regards Georg
