notifyMinSegmentStartTime(startTime) {
    if (this.minSegmentStartTime_ == null) {
      // No data yet, and Math.min(null, startTime) is always 0.  So just store
      // startTime.
      this.minSegmentStartTime_ = startTime;
    } else if (!this.isLive2VodTransition_) {
      this.minSegmentStartTime_ =
          Math.min(this.minSegmentStartTime_, startTime);
    }
  }
Gives PresentationTimeline a Stream's minimum segment start time.

@param {number} startTime
@export