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
