@java.lang.Override
  public com.google.protobuf.ByteString getVttFormatUriBytes() {
    java.lang.Object ref = vttFormatUri_;
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b =
          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
      vttFormatUri_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }
<pre>
The Cloud Storage URI to which recognition results were written as VTT
formatted captions. This is populated only when `VTT` output is requested.
</pre>

<code>string vtt_format_uri = 2;</code>

@return The bytes for vttFormatUri.
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/CloudStorageResult.java