subtitles for smooth streaming with silverlight player

Since subtitles are not supported for smooth streaming with silverlight player, what are the steps to create custom handlers on wowza for this. My initial guess is to create a reader to parse the subtitle file (for our case it is a dfxp file) but I am stuck at how I can provide chunks of this file to the player. Which interfaces/classes should I override and what are the necessary configuration changes?

Thanks.

We don’t have any guidance for this. I’m not sure what to suggest.

Richard