Send the computer's sound from a Mac

A browser on a Mac cannot capture the computer's sound directly. Install the free BlackHole virtual device, send the Mac's output to it, then choose Input device and BlackHole 2ch in the console.

The console’s guide to capturing computer sound on a Mac.
  1. Install BlackHole 2ch. Download it from existential.audio/blackhole, or with Homebrew run: brew install blackhole-2ch.
  2. Open Audio MIDI Setup and create a Multi-Output Device with both BlackHole 2ch and your speakers, so you still hear the sound.
  3. In System Settings → Sound, set Output to that Multi-Output Device.
  4. In the console, step 2 (Audio): choose This browser, set Input type to Input device, then Device to BlackHole 2ch.
  5. Play the audio and press Start broadcast.

Good to know: The console shows these same steps: choose Input device and press macOS system audio? Setup guide.

I only need the sound of one video in the browser.
Then you do not need BlackHole. Choose Browser tab, which works on a Mac as it is.
What about Windows?
No extra software is needed. Choose System audio.
My speakers went quiet after the service.
Set Output in System Settings → Sound back to your speakers.
See it in the video guideOpens the film at this chapter

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