Re: How to control the right and left channel for a specific application using CLI ?

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Le 2020-11-03 23:49, Arun Raghavan a écrit :
On Tue, 3 Nov 2020, at 5:28 PM, 01ivier@xxxxxxxxxxxxx wrote:
Hello again,

I want to know if there is a way, still in command line, to control the
right and left volumes of an application.
With Pulseaudio Volume Control, you can click on the lock icon related
to a launched application, and two sliders appear to do so.
Is it possible in CLI ?

My goal is to run two applications on the same card, but to assign right
channel for one and left for the other.

Possible complication : the output of my application is in mono and with Pulseaudio Volume Control I don't get the two sliders if I click on the
lock icon.

You can use pactl to do this:

  pactl set-sink-input <sink input index> <volume for channel 1>
<volume for channel 2> ...

You can look up the sink input index and channel map for channel order with:

  pactl list sink-inputs

-- Arun

Hello Arun and thanks for the quick answer.

It's exactly the command I was looking for.
Unfortunately, as I thought, it doesn't work in my case because my output is in mono.
Here's what I get:
Failed to set volume: You tried to set volumes for 2 channels, whereas channel(s) supported = 1

I can't change the output of the software.
Is there possibly a way to create a virtual stereo output from the mono ?

Thank you.


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