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 "ffmpeg-20180102-41e51fb-macos64-static.zip", but I don't know what to do with it. Thanks, Spencer Graves
Any other question that don't fit into the other support categorizes.
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