macOS installation of ffmpeg

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macOS installation of ffmpeg

Post by Spencerg » Thu Jan 04, 2018 3:15 pm

I have ffmpeg 3.1.1 under macOS 10.13.2. From something like "ffmpeg -i input.flv -vcodec libvpx -acodec libvorbis output.webm", I get "Unknown encoder 'libvpx'". One source suggested I upgrade using "brew update && brew upgrade ffmpeg --with-libvpx". When I try that, I get:

Error: /usr/local is not writable. You should change the ownership
and permissions of /usr/local back to your user account:
sudo chown -R $(whoami) /usr/local

This "sudo chown" command accepts my password, but 30 seconds later, I get "chown: /usr/local: Operation not permitted".

I downloaded "", but I don't know what to do with it. Thanks, Spencer Graves

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