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>
Start time in seconds for the atom, relative to the input file timeline.
The default is `0s`.
</pre>

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