@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (!thumbnail_.isEmpty()) {
      output.writeBytes(1, thumbnail_);
    }
    for (int i = 0; i < segments_.size(); i++) {
      output.writeMessage(2, segments_.get(i));
    }
    for (int i = 0; i < frames_.size(); i++) {
      output.writeMessage(3, frames_.get(i));
    }
    getUnknownFields().writeTo(output);
  }
<pre>
All video frames where a face was detected.
</pre>

<code>repeated .google.cloud.videointelligence.v1beta2.FaceFrame frames = 3;</code>
java-video-intelligence/proto-google-cloud-video-intelligence-v1beta2/src/main/java/com/google/cloud/videointelligence/v1beta2/FaceAnnotation.java