The problem nearly goes away, as long as pavucontrol is running... skipping then works without hiccups and fading volume only causes a little bit of rasping. Sadly this causes the cpu load to raise over a level that I can accept on this old netbook for a longer time. So this is no workaround for me. Does this give anybody a clue to the cause? This sounds utterly ridiculous to me.... Thanks for any help 2013/11/22 Daniel <windseeker at gmx.de> > Hello Tanu, > > that's a nice catch! Indeed this is exactly what I have, just that volume > changing triggers it way more noticably, because of the high frequency of > triggers. And indeed it's also there when recording from an > alsa-sink.monitor. I just thought this would be fine, because the audio out > of the speakers is fine, but the recorded result is broken just as with a > null-sink. > > I could reproduce that on 3 different machines, so it's reproducable > anytime. Record any audio from any sink.monitor and change volume of the > stream input or the sink itself and watch it happen. > > I am able to grab source code out of a VCS, I can patch and I can compile, > I can package and I can test and analyze. The only thing I cannot do, is > writing code :( > > Anyway: Thank you very much. > > Best, > Daniel > > > 2013/11/22 Tanu Kaskinen <tanu.kaskinen at linux.intel.com> > >> On Fri, 2013-11-22 at 13:56 +0100, Daniel wrote: >> > Dear list, >> > >> > I ask you for some assistance with null-sink and skipping/stutter. >> > >> > On client connect/disconnect and volume changes and many more things, >> > pulseaudio does a buffer rewind to let the changes take effect >> immediately. >> > So far,s o good, on all my soundcards this works like a charm. >> > >> > Now I have some audio stream setup where I play audio to a null-sink and >> > record it from null.monitor. This works really great, until some action >> > like pause/play, volume change, or connecting another audio client is >> > causing a rewind. Then the recorded audio hangs for approx 200ms or even >> > more. On soft volume changes, there are many many rewinds done, and so I >> > have many of these skips. >> > >> > The skipping audio is actually hanging, it does not drop any data. >> There is >> > just a silent break of about 200ms inserted into the stream. >> > >> > Of course it would be great to make rewinding on null sink just work as >> it >> > does on alsa sinks, but in case this is inevitable, I would be fine with >> > some possibility to disable rewinding. I know that all action then are >> > delayed, but that would be okay for me as the stream is delayed about 8 >> > seconds anyway, until it reaches the receiver. >> >> There's no reason why those glitches should be inevitable, so probably >> module-null-sink or the rewind handling of monitor sources in general >> has some bug. Now we just need someone to send a fix for the bug... >> >> Not that this will help you much, but this bug might have the same root >> cause: https://bugs.freedesktop.org/show_bug.cgi?id=68107 >> >> -- >> Tanu >> >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20131224/45751099/attachment.html>
