private com.google.protobuf.SingleFieldBuilderV3<
            com.google.protobuf.Timestamp,
            com.google.protobuf.Timestamp.Builder,
            com.google.protobuf.TimestampOrBuilder>
        getPtsTimeFieldBuilder() {
      if (ptsTimeBuilder_ == null) {
        ptsTimeBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.protobuf.Timestamp,
                com.google.protobuf.Timestamp.Builder,
                com.google.protobuf.TimestampOrBuilder>(
                getPtsTime(), getParentForChildren(), isClean());
        ptsTime_ = null;
      }
      return ptsTimeBuilder_;
    }
<pre>
PTS of the frame.
</pre>

<code>.google.protobuf.Timestamp pts_time = 3;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/GstreamerBufferDescriptor.java