private void maybeForceBuilderInitialization() {
      if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {
        getPreprocessingConfigFieldBuilder();
      }
    }
<pre>
Input asset.
</pre>

Protobuf type {@code google.cloud.video.transcoder.v1.Input}
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/Input.java