public Builder setSegmentStartTime(com.google.protobuf.Timestamp value) {
      if (segmentStartTimeBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        segmentStartTime_ = value;
      } else {
        segmentStartTimeBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000001;
      onChanged();
      return this;
    }
<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>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/VideoActionRecognitionPredictionResult.java