public com.google.protobuf.Timestamp getSegmentStartTime() {
      if (segmentStartTimeBuilder_ == null) {
        return segmentStartTime_ == null
            ? com.google.protobuf.Timestamp.getDefaultInstance()
            : segmentStartTime_;
      } else {
        return segmentStartTimeBuilder_.getMessage();
      }
    }
<pre>
The beginning, inclusive, of the video's time segment in which the
actions have been identified.
</pre>

<code>.google.protobuf.Timestamp segment_start_time = 1;</code>

@return The segmentStartTime.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/VideoActionRecognitionPredictionResult.java