[pulseaudio-discuss] Stuttering sound while recording more then one audio stream

hector at convivencial.org hector at convivencial.org
Tue Jul 28 02:59:05 PDT 2015

Hello Laurens,

I am no expert by any means, but it is my impression that the loopback 
module is "buggy", at some places at least.

For example, it does not honor requested latency really (for me sound 
stopped working too). You could try the patches Georg Chini submitted 
back in February and see if they fix your issues too, but note it might 
be a long shot:


They worked for me, but they are in queue for review 
(http://www.freedesktop.org/wiki/Software/PulseAudio/PatchStatus/) so 
you need to manually apply them (either to master or to the latest 
stable tag). I am not very sure who makes the reviews, but it strikes me 
that a contribution for a non-default module that turns something broken 
into something not so broken sits there just waiting forever. But well, 
that's another discussion.

I wish you luck on your issue,


On 2015-07-25 04:43, Laurens Nikolaisen wrote:
> Hello there!
> My plan is to do record game sound of an OpenGL game at the same time
> while I'm recording my microphones voice. If I try to do so using
> pulse audio the sound will stutter after a few seconds. In [0] they
> say it seems to be related to pulse audio - but still nobody could
> solve the problem.
> What I did:
> "Create null outputs and connect them with loopback streams so the
> game audio is sent to the speakers, but also combined with the
> microphone and sent to SimpleScreenRecorder. This is what we want to
> achieve:
> To do this, run the following commands:
> pactl load-module module-null-sink sink_name=duplex_out
> pactl load-module module-null-sink sink_name=game_out
> pactl load-module module-loopback source=game_out.monitor
> pactl load-module module-loopback source=game_out.monitor
> sink=duplex_out
> pactl load-module module-loopback sink=duplex_out
> Now you should open PulseAudio Volume Control and send the audio from
> the game to the second null output (game_out), and set the audio
> source in SimpleScreenRecorder to the first null output (duplex_out).
> This should be done from the input page - do not use PulseAudio Volume
> Control to change the audio source for SimpleScreenRecorder because
> the change will be lost whenever you pause and resume the recording."
> SOURCE: [0]
> Do you guys have any idea if this is a bug and if there's a known
> workaround?
> Many thanks in advance!
> Laurens
> [0]
> http://www.maartenbaert.be/simplescreenrecorder/recording-game-audio/
> [1]
> Links:
> ------
> [1] 
> http://www.maartenbaert.be/simplescreenrecorder/recording-game-audio/
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