public Builder clearStartTimeOffset() {
      bitField0_ = (bitField0_ & ~0x00000008);
      startTimeOffset_ = null;
      if (startTimeOffsetBuilder_ != null) {
        startTimeOffsetBuilder_.dispose();
        startTimeOffsetBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Ad break start time in seconds relative to the start of the VOD asset.
</pre>

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