Simple video player in Ruby

gistfile1.rb

# Written by Pioz.
#
# Deps:
#  sudo apt-get install libgtk2.0-dev libgstreamer0.10-dev gstreamer0.10-plugins-base
#  gem install gtk2 gstreamer

require 'gtk2'
require 'gst'

if ARGV.size != 1
  puts "Usage: #{$0} <file>"
  exit 0
end

class VideoWidget < Gtk::DrawingArea
  def initialize(file)
    super()  
    @pipeline = Gst::ElementFactory.make('playbin')
    @pipeline.uri = "file://#{File.absolute_path(file)}"
    @pipeline.video_sink = Gst::ElementFactory.make('xvimagesink')
    @pipeline.video_sink.force_aspect_ratio = true
    @pipeline.audio_sink = Gst::ElementFactory.make('autoaudiosink')
    @pipeline.signal_connect('notify') do
      @pipeline.video_sink.xwindow_id = self.window.xid
      @pipeline.video_sink.expose
    end
    @pipeline.ready
  end

  def play
    @pipeline.play
  end

  def pause
    @pipeline.pause
  end

  def stop
    @pipeline.stop
  end

  def seek(time)
    @pipeline.seek(1.0, Gst::Format::TIME,
                  Gst::Seek::FLAG_FLUSH | Gst::Seek::FLAG_KEY_UNIT,
                  Gst::Seek::TYPE_CUR, time * Gst::SECOND,
                  Gst::Seek::TYPE_NONE, -1);
  end
end



window = Gtk::Window.new
video = VideoWidget.new(ARGV.first)

buttonbox = Gtk::HButtonBox.new

button = Gtk::Button.new(Gtk::Stock::MEDIA_PLAY)
button.signal_connect('clicked') { video.play }
buttonbox.add(button)

button = Gtk::Button.new(Gtk::Stock::MEDIA_PAUSE)
button.signal_connect('clicked') { video.pause }
buttonbox.add(button)

button = Gtk::Button.new(Gtk::Stock::MEDIA_STOP)
button.signal_connect('clicked') { video.stop }
buttonbox.add(button)

button = Gtk::Button.new(Gtk::Stock::MEDIA_REWIND)
button.signal_connect('clicked') { video.seek(-10) }
buttonbox.add(button)

button = Gtk::Button.new(Gtk::Stock::MEDIA_FORWARD)
button.signal_connect('clicked') { video.seek(10) }
buttonbox.add(button)

hbox = Gtk::HBox.new
hbox.pack_start(buttonbox, false)

vbox = Gtk::VBox.new
vbox.pack_start(video)
vbox.pack_start(hbox, false)

window.add(vbox)
window.signal_connect('destroy') do
  video.stop
  Gtk.main_quit 
end
window.set_default_size(640, 480)
window.window_position = Gtk::Window::POS_CENTER
window.show_all

Gtk.main