Anyway requesting tesseract as decendacy of  ffmpeg makes no sense for me 
(and it is not listed at https://trac.ffmpeg.org/wiki/CompilationGuide/macOS). 
So something in homebrew should be fixed/setup correctly.


I did a little investigation and discovered that this is principally a 
Homebrew issue where:

- tesseract is a non-optional dependency of ffmpeg [1][2] (and the default 
tap doesn't allow configuration options)
- the homebrew recipe for tesseract always does a `make training` [3]

It looks like your options, if you want to stick with a Homebrew install of 
ffmpeg are:

- use the alternate Homebrew tap and don't specify --with--tesseract [4]
    brew tap homebrew-ffmpeg/ffmpeg
    brew install homebrew-ffmpeg/ffmpeg/ffmpeg

- use FFMPEG 2.8 which doesn't have the tesseract dependency [5]

Hope that helps!

Tom

[1] https://formulae.brew.sh/formula/ffmpeg#default
[2] 
https://github.com/Homebrew/homebrew-core/blob/000e5225e1c0db87622f89e61140637ef8e7a8d5/Formula/f/ffmpeg.rb#L59
[3] 
https://github.com/Homebrew/homebrew-core/blob/000e5225e1c0db87622f89e61140637ef8e7a8d5/Formula/t/tesseract.rb#L68
[4] https://trac.ffmpeg.org/wiki/CompilationGuide/macOS#Additionaloptions
[5] https://formulae.brew.sh/formula/ffmpeg@2.8 
 

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