public com.google.cloud.video.transcoder.v1.MuxStream.Builder addMuxStreamsBuilder(int index) {
      return getMuxStreamsFieldBuilder()
          .addBuilder(index, com.google.cloud.video.transcoder.v1.MuxStream.getDefaultInstance());
    }
<pre>
List of multiplexing settings for output streams.
</pre>

<code>repeated .google.cloud.video.transcoder.v1.MuxStream mux_streams = 4;</code>
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/JobConfig.java