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Hi Sean, </div>
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<br>
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thanks a bunch for your hints, I appreciate it !</div>
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The 'qpwgraph' GUI really helps me picturing how all inputs and outputs are supposed to get connected,</div>
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so I go from there !</div>
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<br>
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so, thanks again and have a nice day !</div>
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<br>
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Pieter</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>Van:</b> pulseaudio-discuss <pulseaudio-discuss-bounces@lists.freedesktop.org> namens Sean Greenslade <sean@seangreenslade.com><br>
<b>Verzonden:</b> donderdag 12 mei 2022 08:36<br>
<b>Aan:</b> General PulseAudio Discussion <pulseaudio-discuss@lists.freedesktop.org><br>
<b>Onderwerp:</b> [EXTERNAL] Re: [pulseaudio-discuss] pavucontrol : input device listed, but no signal</font>
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<div class="PlainText">On Fri, May 06, 2022 at 11:33:55AM +0000, Pieter J Voet wrote:<br>
> Hi all,<br>
> <br>
> I'm running Fedora 35 which has pipewire. Next, I have an external USB DAC ( Behringer Firepower FCA610 ).<br>
> My speakers are connected to the USB DAC, and it's configured as the default output sink.<br>
> This all works fine, audio on my laptop plays thru the USB DAC.<br>
> I have three userspace processes running : 'pipewire', 'pipewire-pulse' and 'wireplumber'.<br>
<br>
In that case, this is probably not the right place to ask for help.<br>
Pipewire bills itself as a replacement for pulseaudio. If you are<br>
running pipewire, you should probably find a pipewire support list<br>
instead.<br>
<br>
> Now, I have a keyboard plugged in the USB DAC analog input, and can hear it's sound on my speakers.<br>
> I can play audio on my laptop, play something on the keyboard simultaneously, and it all plays fine<br>
> with audio output on my speakers.<br>
> <br>
> So far, so good. But what I want is to record from the USB DAC analog input.<br>
> Unfortunately that's not working. Using Audacity, I can click 'Start Monitoring' , but there's no sound.<br>
> <br>
> To simplify things and rule out Audacity, I see that 'pavucontrol' ( GUI ) lists the UDB DAC both as an Output and an<br>
> Input Device. But the 'Input Devices' tab does not show output signal level upon pressing the<br>
> keys on the keyboard...<br>
> Again, I can hear the keyboard on the USB DAC attached speakers. This means that the input stream<br>
> is somehow redirected to the output-sink right ?<br>
<br>
Based on my limited skim of the pipewire docs, it seems that pipewire<br>
just presents a pulseaudio-compatible API for the purpose of allowing<br>
existing pulse client software to work as-is. They may not have gone to<br>
the trouble of exposing all the APIs that pavucontrol needs. Using<br>
pavucontrol with pipewire may not work as expected.<br>
<br>
If you're looking for GUI tools to control pipewire, maybe check these<br>
out:<br>
<br>
<a href="https://wiki.archlinux.org/title/PipeWire#GUI">https://wiki.archlinux.org/title/PipeWire#GUI</a>
<br>
<br>
> I'm a long-time Linux user, but Pipewire/Pulseaudio really confuses me. I don't know what to do..<br>
> <br>
> To make the story even weirder : sometimes after a reboot the USB DAC 'Input Device' actually has<br>
> a signal !! And I can then record in Audacity.<br>
> But that's 'sometimes'.. My latests attempts by rebooting do not give me inputsignal level anymore.<br>
> <br>
> This all probably is caused by my lack of knowledge of pipewire/pulseaudio.. but hopefully somebody<br>
> can educate me a bit on this.<br>
<br>
Pipewire and pulseaudio are two different sound servers, and it's<br>
unlikely that they will coexist cleanly on the same machine. If you want<br>
to stick with pipewire, then seek help on a pipewire forum. If you want<br>
to try pulseaudio, you will need to figure out how to disable pipewire<br>
and install / enable pulseaudio.<br>
<br>
--Sean<br>
<br>
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