public Builder setTrackId(long value) {

      trackInfoCase_ = 5;
      trackInfo_ = value;
      onChanged();
      return this;
    }
<pre>
Streaming mode ONLY.
In streaming mode, we do not know the end time of a tracked object
before it is completed. Hence, there is no VideoSegment info returned.
Instead, we provide a unique identifiable integer track_id so that
the customers can correlate the results of the ongoing
ObjectTrackAnnotation of the same track_id over time.
</pre>

<code>int64 track_id = 5;</code>

@param value The trackId to set.
@return This builder for chaining.
java-video-intelligence/proto-google-cloud-video-intelligence-v1/src/main/java/com/google/cloud/videointelligence/v1/ObjectTrackingAnnotation.java