- delta = ss - self.ss_prev_step
- speed = self.samplerate / delta / self.scale
- speed_txt = self.format % speed
+ if self.samplerate:
+ delta = ss - self.ss_prev_step
+ speed = self.samplerate / delta / self.scale
+ speed_txt = self.format % speed
+ self.put(self.ss_prev_step, ss, self.out_ann,
+ [0, [speed_txt + ' ' + self.unit + '/s', speed_txt]])