public Builder clearStartTimeOffset() {
        bitField0_ = (bitField0_ & ~0x00000002);
        startTimeOffset_ = null;
        if (startTimeOffsetBuilder_ != null) {
          startTimeOffsetBuilder_.dispose();
          startTimeOffsetBuilder_ = null;
        }
        onChanged();
        return this;
      }
<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