ClutterTimeline @cluttertimeline: the object which received the signal. @cluttertimeline: the object which received the signal. @arg1: @cluttertimeline: the object which received the signal. @cluttertimeline: the object which received the signal. @nframes: @fps: @Returns: @timeline: @fps: @timeline: @timeline: @timeline: @timeline: @loop: @timeline: @Returns: @timeline: @timeline: @nframes: @timeline: @frame_num: @timeline: @Returns: @timeline: @Returns: @timeline: @Returns: