[pulseaudio-discuss] Networked pulseaudio problems

Laurențiu Nicola lnicola at dend.ro
Tue Feb 18 07:10:36 PST 2014


Are you using RTP or the native protocol? I'm having this kind of
difficulties with RTP, but in my case it's caused by the WiFi latency
jitter. While the throughput is clearly enough for audio, my network has
latency spikes high enough to -- I assume -- confuse the clock skew
estimation in module-rtp-recv. [1] seems to be talking about the same
issue, and I think the patch from that repository reverts the code to a
much older version.

The effect is sometimes the audio cutting off about once a second --
even minutes after the spike has passed -- and sometimes stopping
completely. When it stops, I have to restart PA.

Can you try this over a wired connection?


[1] https://fruit.je/mpd-rtp , see the "Setting up the clients" section.

On Tue, Feb 18, 2014, at 16:20, ad at pk.dy.fi wrote:
> I've setup Pulseaudio so that I can direct the sound from my laptop to my 
> media player (Raspberry PI), but there is a problem. For some reason the 
> pulseaudio on PI starts to "cut" the sound every few minutes. By that I 
> mean that the playback pauses for a short while several times and then 
> continues. These "cuts" last a few seconds in total. I checked the 
> CPU-usage of Pulseaudio on PI to see if that was the problem (PI is not 
> terribly powerful), but Pulseaudio only seems to use around 20% CPU and 
> there isn't much else happening on the PI, so that's not likely to be the 
> problem.
> I also tried changing pulseaudio resampling method to see if that would 
> help. It does the same even with "trivial" resampler (though the overall 
> sound quality drops significantly). It seems to be a problem with wlan, 
> but how come 54 Mbps (802.11g) isn't enough for pulseaudio?! The pi is 
> using a wired connection. 150 MBps 802.11n would seem to work, but to me 
> that sounds like excess use of bandwidth.
> Any idea how could I fix them? Is there a way to increase some buffer or 
> something?
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