private com.google.protobuf.SingleFieldBuilderV3<
            com.google.protobuf.Duration,
            com.google.protobuf.Duration.Builder,
            com.google.protobuf.DurationOrBuilder>
        getOffsetFieldBuilder() {
      if (offsetBuilder_ == null) {
        offsetBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.protobuf.Duration,
                com.google.protobuf.Duration.Builder,
                com.google.protobuf.DurationOrBuilder>(
                getOffset(), getParentForChildren(), isClean());
        offset_ = null;
      }
      return offsetBuilder_;
    }
<pre>
The offset in seconds if the event type is `PROGRESS`.
</pre>

<code>.google.protobuf.Duration offset = 4;</code>
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/Event.java