'Clean-up and collect the process used to write the movie file.'

def cleanup(self):

    (out, err) = self._proc.communicate()
    self._frame_sink().close()
    verbose.report((u'MovieWriter    --    Command    stdout:\n%s' % out), level=u'debug')
    verbose.report((u'MovieWriter    --    Command    stderr:\n%s' % err), level=u'debug')
