Error: Could not symlink lib/librtmp.dylib
Target /usr/local/lib/librtmp.dylib
already exists. You may want to remove it:
rm '/usr/local/lib/librtmp.dylib'
To force the link and overwrite all conflicting files:
brew link --overwrite rtmpdump
To list all files that would be deleted:
brew link --overwrite --dry-run rtmpdump