public Builder setStartTimeOffset(com.google.protobuf.Duration.Builder builderForValue) {
      if (startTimeOffsetBuilder_ == null) {
        startTimeOffset_ = builderForValue.build();
      } else {
        startTimeOffsetBuilder_.setMessage(builderForValue.build());
      }
      bitField0_ |= 0x00000040;
      onChanged();
      return this;
    }
<pre>
Start time in seconds, relative to the output file timeline. Determines the
first sprite to pick. The default is `0s`.
</pre>

<code>.google.protobuf.Duration start_time_offset = 7;</code>
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/SpriteSheet.java