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Ruby FFI bindings to libextractor, a library for extracting metadata from a variety of file formats.

libextractor is a simple library for keyword extraction. libextractor does not support all formats but supports a simple plugging mechanism such that you can quickly add extractors for additional formats, even without recompiling libextractor. libextractor typically ships with a dozen helper-libraries that can be used to obtain keywords from common file-types.

libextractor is a part of the GNU project.


require 'ffi/extractor'

FFI::Extractor.extract(data) do |plugin,type,format,mime_type,data|
  # ...

FFI::Extractor.extract_from(path) do |plugin,type,format,mime_type,data|
  # ...



$ gem install ffi-extractor


$ sudo yum install libextractor libextractor-plugins


$ sudo apt-get install libextractor libextractor-plugins


$ brew install libextractor


ffi-extractor - Ruby FFI bindings for libextractor

Copyright (c) 2012 - Hal Brodigan (postmodern.mod3 at

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA