public com.google.cloud.video.transcoder.v1.PreprocessingConfig.AudioOrBuilder
        getAudioOrBuilder() {
      if (audioBuilder_ != null) {
        return audioBuilder_.getMessageOrBuilder();
      } else {
        return audio_ == null
            ? com.google.cloud.video.transcoder.v1.PreprocessingConfig.Audio.getDefaultInstance()
            : audio_;
      }
    }
<pre>
Audio preprocessing configuration.
</pre>

<code>.google.cloud.video.transcoder.v1.PreprocessingConfig.Audio audio = 4;</code>
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/PreprocessingConfig.java