public com.google.cloud.videointelligence.v1p3beta1.LabelAnnotation.Builder
        getFrameLabelAnnotationsBuilder(int index) {
      return getFrameLabelAnnotationsFieldBuilder().getBuilder(index);
    }
<pre>
Label annotations on frame level.
There is exactly one element for each unique label.
</pre>

<code>
repeated .google.cloud.videointelligence.v1p3beta1.LabelAnnotation frame_label_annotations = 4;
</code>
java-video-intelligence/proto-google-cloud-video-intelligence-v1p3beta1/src/main/java/com/google/cloud/videointelligence/v1p3beta1/VideoAnnotationResults.java