private com.google.protobuf.SingleFieldBuilderV3<
              com.google.protobuf.Duration,
              com.google.protobuf.Duration.Builder,
              com.google.protobuf.DurationOrBuilder>
          getStartTimeOffsetFieldBuilder() {
        if (startTimeOffsetBuilder_ == null) {
          startTimeOffsetBuilder_ =
              new com.google.protobuf.SingleFieldBuilderV3<
                  com.google.protobuf.Duration,
                  com.google.protobuf.Duration.Builder,
                  com.google.protobuf.DurationOrBuilder>(
                  getStartTimeOffset(), getParentForChildren(), isClean());
          startTimeOffset_ = null;
        }
        return startTimeOffsetBuilder_;
      }
<pre>
The time to start displaying the overlay object, in seconds. Default: 0
</pre>

<code>.google.protobuf.Duration start_time_offset = 2;</code>
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/Overlay.java