Why the playing audio will be recorded into the mic?

[guest271314]

This
https://github.com/guest271314/captureSystemAudio?tab=readme-ov-file#pulseaudio-module-remap-source
is what I have used to create a remapped source that is the monitor device
that can be selected as a microphone by interfaces such as
navigator.mediaDevices.getUserMedia() on Chromium and Chrome browsers,
which forthe past 5 years did not provide a means to capture system audio,
until this
https://gist.github.com/guest271314/baaa0b8d4b034ff4e9352af4f2bbf42c was
recently implemented

pactl load-module module-remap-source \
  master=@DEFAULT_MONITOR@ \
  source_name=speakers source_properties=device.description=Speakers \
&& pactl set-default-source speakers

On Sun, May 26, 2024 at 7:07 AM 赵成义 <zhaochengyi at uniontech.com> wrote:

>
> Are you expecting to be able to record "What-U-Hear" in the headphones
> from the microphone?
>
> > Yes.
>
> On Wed, May 22, 2024 at 7:40 PM 赵成义 <zhaochengyi at uniontech.com> wrote:
>
>> Hi guys,
>>
>> >>  I mean I don't need to record played audio, but it is recored into
>> the mic.
>> >> I can confirm that ALSA loopback is set to false state, and the sink
>> monitor
>> >>  is not used.
>> > You probably need echo cancellation
>>
>> The output audio is not sent to the speakers, but from the headphones,
>> and the mic cannot pick up the played audio from the air,
>> so I don't think it's an echo issue.
>>
>> I am using a four-section headset, and the input and output are on the
>> same audio port.
>> Is it possible that there is signal interference in the input and output?
>>
>> Thanks,
>>
>> Chengyi
>>
>
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