public Builder mergeTimeOffset(com.google.protobuf.Duration value) {
      if (timeOffsetBuilder_ == null) {
        if (((bitField0_ & 0x00000002) != 0)
            && timeOffset_ != null
            && timeOffset_ != com.google.protobuf.Duration.getDefaultInstance()) {
          getTimeOffsetBuilder().mergeFrom(value);
        } else {
          timeOffset_ = value;
        }
      } else {
        timeOffsetBuilder_.mergeFrom(value);
      }
      if (timeOffset_ != null) {
        bitField0_ |= 0x00000002;
        onChanged();
      }
      return this;
    }
<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