child_pid = fork do
      Signal.trap("HUP") { puts "Exiting..."; exit }
      daemonize
      system("ffmpeg -y -i #{digital_asset.path.gsub(/ /, '\ ')} -ar 22050 -s #{size[0]}x#{size[1]} #{shell_flv_path} > /dev/null")
    end

    DigitalAsset.new(:path => flv_path, :asset_id => digital_asset.asset.id,
      :file_name => digital_asset.file_name.gsub(/\..+/, PREVIEW_EXT),
      :content_type => "video/x-flv").save
    thumb_movie = RMovie::Movie.new(digital_asset.path)
    if thumb_movie.next_key_frame
      add_movie_thumbnail(thumb_movie, thumb_movie.frame_number, digital_asset)
      while thumb_movie.next_key_frame
        add_movie_thumbnail(thumb_movie, thumb_movie.frame_number, digital_asset)
      end
    else
      add_movie_thumbnail(thumb_movie, 1, digital_asset)
    end
    sleep 5
    if !File.exists?(shell_flv_path) || File.stat(shell_flv_path).size == 0
      Process.kill("HUP", child_pid)
    end