public com.google.protobuf.Duration.Builder getStartTimeOffsetBuilder() {
        bitField0_ |= 0x00000004;
        onChanged();
        return getStartTimeOffsetFieldBuilder().getBuilder();
      }
<pre>
The time to start the fade animation, in seconds. Default: 0
</pre>

<code>.google.protobuf.Duration start_time_offset = 3;</code>
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/Overlay.java