docs: def time_seg_to_index(time_str, slide_step):
      """
      将时间片字符串转换为时间片索引值
      :param time_str: eg: '11:10:21'
      :param slide_step:
      :return:
      """
      minutes_idx = time_util.time_str_to_minutes(time_str)
      time_seg_idx = minutes_idx // slide_step
      return time_seg_idx