public Builder clearSegmentStartTime() {
      bitField0_ = (bitField0_ & ~0x00000001);
      segmentStartTime_ = null;
      if (segmentStartTimeBuilder_ != null) {
        segmentStartTimeBuilder_.dispose();
        segmentStartTimeBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
The beginning, inclusive, of the video's time segment in which the
current identifications happens.
</pre>

<code>.google.protobuf.Timestamp segment_start_time = 1;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/VideoObjectTrackingPredictionResult.java