private void ensureFramesIsMutable() {
      if (!((bitField0_ & 0x00000004) != 0)) {
        frames_ = new java.util.ArrayList<com.google.cloud.videointelligence.v1.FaceFrame>(frames_);
        bitField0_ |= 0x00000004;
      }
    }
<pre>
All video segments where a face was detected.
</pre>

<code>repeated .google.cloud.videointelligence.v1.FaceSegment segments = 2;</code>
java-video-intelligence/proto-google-cloud-video-intelligence-v1/src/main/java/com/google/cloud/videointelligence/v1/FaceAnnotation.java