public Builder mergeOffset(com.google.protobuf.Duration value) {
      if (offsetBuilder_ == null) {
        if (((bitField0_ & 0x00000008) != 0)
            && offset_ != null
            && offset_ != com.google.protobuf.Duration.getDefaultInstance()) {
          getOffsetBuilder().mergeFrom(value);
        } else {
          offset_ = value;
        }
      } else {
        offsetBuilder_.mergeFrom(value);
      }
      if (offset_ != null) {
        bitField0_ |= 0x00000008;
        onChanged();
      }
      return this;
    }
<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