It's just doesn't works for me.

[Hegosder]

Hi, everything seems fine for me. But it didn't work.

Google Chrome: 86.0.4240.193
Windows 10
I'm using Mix Stereo also.

But this thing says Error: no-speech.

Edit: I tried to talk with my mic and it worked. So it looks like my mix stereo settings are wrong. What should I do? Can you give some advices to me?

[JeanCaro]

1. In seconds 22 video, show change input record.
   https://youtu.be/Q-7P6Xgqwb0?t=22
   

2. Or Stereo Mix as the default recording device. (All applications that use the microphone will use the Stereo mix, as an input/recording device.)
   

3. links help
   https://www.partitionwizard.com/partitionmanager/stereo-mix-not-working.html
   https://www.howtogeek.com/howto/39532/how-to-enable-stereo-mix-in-windows-7-to-record-audio/

READ, READ; what-is-stereo-mix-supposed-to-be-used-for-in-windows
https://superuser.com/questions/753061/what-is-stereo-mix-supposed-to-be-used-for-in-windows

"Stereo Mix" is the name given to the output stream (presented as a virtual audio device) after all channels have been combined.
It's a mix of all the channels, and is sometimes referred to (in the past anyway) as "What you hear".