def ensure_utf8
    # TODO Proper solution using https://github.com/brianmario/charlock_holmes & detection
    # processing copied from http://trackingrails.com/posts/video-encoding-processor-for-carrierwave
    cache_stored_file! if !cached?

    file_data = File.read(current_path)

    # Ugh. Only way to detect bad UTF8. See
    # http://bibwild.wordpress.com/2012/04/17/checkingfixing-bad-bytes-in-ruby-1-9-char-encoding/
    is_valid_utf8 = begin
      file_data =~ //
      true
    rescue ArgumentError => e
      if e.message == 'invalid byte sequence in UTF-8'
        false
      else
        raise
      end
    end

    if !is_valid_utf8
      # Assume that it's windows-1252
      File.open(current_path, 'w+') do |f|
        f.write file_data.encode('UTF-8', 'windows-1252', :replace => '?', :invalid => :replace, :undef => :replace)
      end
    end
  end