installing ffmpeg on Mac fail

Question

I tried to install ffmpeg on Mac(macOS 10.13) with : brew install ffmpeg

but I got below ....

Updating Homebrew...
Warning: You are using macOS 10.13.
We (and Apple) do not provide support for this old version.
You will encounter build failures with some formulae.
Please create pull requests instead of asking for help on Homebrew's GitHub,
Twitter or any other official channels. You are responsible for resolving
any issues you experience while you are running this
old version.

Error: ffmpeg: no bottle available!
You can try to install from source with:
  brew install --build-from-source ffmpeg
Please note building from source is unsupported. You will encounter build
failures with some formulae. If you experience any issues please create pull
requests instead of asking for help on Homebrew's GitHub, Twitter or any other
official channels.

Answer 1

Homebrew presently carries bottles for macOS 10.14 Mojave and later.

You can try to install from source with:

 brew install --build-from-source ffmpeg

Please note building from source is unsupported. You will encounter build failures with some formulae.