add note about removing ffmpeg first

This addresses Homebrew/brew#5796
varenc · Feb 25, 2019 · 258de36 · 258de36
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commit 258de36
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diff --git a/README.md b/README.md
@@ -21,6 +21,8 @@ brew tap varenc/ffmpeg
 brew tap-pin varenc/ffmpeg
 ```
 
+**Note:** If you already have `ffmpeg` installed from Homebrew core, you need to first run `brew uninstall ffmpeg` before you can use this tap.
+
 ### Default installation
 
 To install the default version of the formula, run: