public Builder setAudio(com.google.cloud.video.transcoder.v1.PreprocessingConfig.Audio value) {
      if (audioBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        audio_ = value;
      } else {
        audioBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000008;
      onChanged();
      return this;
    }
<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