private com.google.protobuf.SingleFieldBuilderV3<
            com.google.protobuf.Duration,
            com.google.protobuf.Duration.Builder,
            com.google.protobuf.DurationOrBuilder>
        getTimeOffsetFieldBuilder() {
      if (timeOffsetBuilder_ == null) {
        timeOffsetBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.protobuf.Duration,
                com.google.protobuf.Duration.Builder,
                com.google.protobuf.DurationOrBuilder>(
                getTimeOffset(), getParentForChildren(), isClean());
        timeOffset_ = null;
      }
      return timeOffsetBuilder_;
    }
<pre>
The timestamp of the frame in microseconds.
</pre>

<code>.google.protobuf.Duration time_offset = 2;</code>
java-video-intelligence/proto-google-cloud-video-intelligence-v1p2beta1/src/main/java/com/google/cloud/videointelligence/v1p2beta1/ObjectTrackingFrame.java