[pulseaudio-discuss] Audio Capture ( recording a Skype conversation )

[Chris cowden]

Thanks for your response.  I will attempt your recommendation.  

> > pacat -r -d alsa_input.pci-0000_00_14.2.analog-stereo | pacat -p -d 
> > alsa_output.pci-0000_00_14.2.analog-stereo.monitor
> 
> This will certainly not work. YOu are trying to record from your input
> device (mic) and then play it back via another input device (the monitor
> of you output is an input!).

That's what I thought that command was doing, but I didn't have the confidence of a good knowledge base to rule it out.  

> This means that you will effectively be recording both your mic and the
> output of your sound card and playing back both streams on the null
> sink. As it is a null sink you wont be able to hear it, but you should
> be able to see the VU meter in the playback tab of pavucontrol.

When you say I won't be able to hear it, do you mean the recorded stream, or do you mean everything even my VoIP conversation?  

Thanks.

> > Dear PulseAudio community,
> > 
> > My apologies if this is either a double post or simply a stupid
> > question.  As the subject line suggests I'm interested in recording
> > something like a Skype conversation.  I say something like a Skype
> > conversation because I work with some similar voip teleconferencing
> > programs other than Skype.
> > 
> > I've been looking in several places for some information.  Hopefully I'm
> > close to having a solution, but I'm not quite there.
> > 
> > pacat -r -d alsa_output.pci-0000_00_14.2.analog-stereo.monitor
> > 
> > I've used the above command to capture audio passing through my sound
> > server. 
> 
> Good so far.
> 
> > I've also added a virtual device in my
> > /etc/alas/pulse-default.conf file.  So I can also capture that audio
> > with other programs such as Audacity.
> 
> THis is not really correct. For one you should not really edit the
> system files, but instead edit your own users' ~/.asoundrc file.
> 
> Secondly, what definition did you add here? In theory you should need
> none. You generally should just tell audacity to "use pulse" then when
> it is recording fire up an application like pavucontrol, go to the
> "Recording tab" and locate the Audacity recroding stream, then move it
> so that it is recording from the monitor device you want. This choice
> will be remembered for next time.
> 
> 
> >  So I need to include my
> > microphone to the recording. 
> > 
> > I've found the following command, which doesn't work for me, to pass two
> > streams:
> > 
> > pacat -r -d alsa_input.pci-0000_00_14.2.analog-stereo | pacat -p -d 
> > alsa_output.pci-0000_00_14.2.analog-stereo.monitor
> 
> This will certainly not work. YOu are trying to record from your input
> device (mic) and then play it back via another input device (the monitor
> of you output is an input!).
> 
> If you were to play it back properly, it would sound awful to the person
> speaking on the VoIP app in question.
> 
> I'll outline my recommendation below.
> 
> > The above results in:
> > 
> > Stream error: No such entity
> > write() failed: Broken pipe
> > 
> > for me.
> > 
> > So, is there a way to combine my two devices?  I'm assuming something
> > like a pacmd script will do the trick, but I don't yet understand how
> > the module-combine statements work. 
> 
> Well module-combine is technially module-combine-sink. i.e. is allows
> you to combine multiple outputs, but not multiple inputs.
> 
> What you want to do is take two inputs (your mic and the monitor of your
> output) and combine then and record them. There is not (currently) a
> module-combine-source so this is impossible.
> 
> However you can do soemthing that approximates this.
> 
> Firstly load a null sink:
> 
> pactl load-module module-null-sink sink_name='foo'
> 
> Then load two module loops backs:
> 
> pactl load-module module-loopback
> pactl load-module module-loopback
> 
> 
> Using pavucontrol, connect the output of the two loopbacks to the null
> sink. Connect the input of the two loopbacks to:
>  alsa_output.pci-0000_00_14.2.analog-stereo.monitor
> and
>  alsa_input.pci-0000_00_14.2.analog-stereo
> 
> This means that you will effectively be recording both your mic and the
> output of your sound card and playing back both streams on the null
> sink. As it is a null sink you wont be able to hear it, but you should
> be able to see the VU meter in the playback tab of pavucontrol.
> 
> Then in order to record the combined result, you will simply select
> foo.monitor.
> 
> pacat -r -d foo.monitor
> 
> 
> Jobs a good 'un! :p
> 
> HTHs
> 
> Col
> 
> 
> -- 
> 
> Colin Guthrie
> gmane(at)colin.guthr.ie
> http://colin.guthr.ie/
> 
> Day Job:
>   Tribalogic Limited [http://www.tribalogic.net/]
> Open Source:
>   Mandriva Linux Contributor [http://www.mandriva.com/]
>   PulseAudio Hacker [http://www.pulseaudio.org/]
>   Trac Hacker [http://trac.edgewall.org/]
> 
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