public com.google.protobuf.ByteString getDefaultSlateBytes() {
      java.lang.Object ref = defaultSlate_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
        defaultSlate_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<pre>
This must refer to a slate in the same
project. If Google Ad Manager (GAM) is used for ads, this string sets the
value of `slateCreativeId` in
https://developers.google.com/ad-manager/api/reference/v202211/LiveStreamEventService.LiveStreamEvent#slateCreativeId
</pre>

<code>string default_slate = 7 [(.google.api.resource_reference) = { ... }</code>

@return The bytes for defaultSlate.
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/LiveConfig.java