public Builder addFrameLabelAnnotations(
        com.google.cloud.videointelligence.v1p1beta1.LabelAnnotation value) {
      if (frameLabelAnnotationsBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        ensureFrameLabelAnnotationsIsMutable();
        frameLabelAnnotations_.add(value);
        onChanged();
      } else {
        frameLabelAnnotationsBuilder_.addMessage(value);
      }
      return this;
    }
<pre>
Label annotations on frame level.
There is exactly one element for each unique label.
</pre>

<code>
repeated .google.cloud.videointelligence.v1p1beta1.LabelAnnotation frame_label_annotations = 4;
</code>
java-video-intelligence/proto-google-cloud-video-intelligence-v1p1beta1/src/main/java/com/google/cloud/videointelligence/v1p1beta1/VideoAnnotationResults.java