change owner of brew to root, which is common for files in /usr/local directory ( opposed to either /home or /Users )

sudo chown root /usr/local/bin/brew

and/or add the admin group
sudo chown root:admin /usr/local/bin/brew


sudo brew install ffmpeg --with-fdk-aac --with-ffplay --with-freetype --with-frei0r --with-libass --with-libvo-aacenc --with-libvorbis --with-libvpx --with-opencore-amr --with-openjpeg --with-opus --with-openssl --with-rtmpdump --with-schroedinger --with-speex --with-theora --with-tools --with-x265 --with-faac --with-lame --with-x264 --with-xvid