def __init__(self, **kw):
super(View, self).__init__(**kw)
self.orientation='vertical'
self._do_update=False
progress=ProgressBar()
progress.size_hint=(1., None)
progress.height=3
self._progress=progress
self.add_widget(progress)
btn_0=Button(text='Pipe')
btn_0.bind(on_press=self.on_press_pipe)
self.add_widget(btn_0)
btn_1=Button(text='Transcoder')
btn_1.bind(on_press=self.on_press_transcoder)
self.add_widget(btn_1)
