Roku Developer Program

[panzhuli]

HI all - I'm implementing closed captioning in my app, but they're appearing in the middle of the screen. I don't see an obvious way with the roVideoScreen to position the captions. Here's my code:

subtitle_config = {
      TrackName: episode.ccURL
  }
  metadata = {
      Stream: {
          Url: episode.stream
      },
      StreamFormat: "hls",
      SubtitleConfig: subtitle_config
  }
  screen.SetContent(metadata)

The captions are TTML and include the following:

<layout>
<region xml:id="subtitleArea" style="s1" tts:extent="560px 62px" tts:padding="5px 3px" tts:backgroundColor="black" tts:displayAlign="after"/>
</layout>

So there's nothing in there about positioning. Any advice is appreciated. Thanks!