The functionality is mentioned in passing in the description of manifestData (https://sdkdocs.roku.com/display/sdkdoc/Video#Video-Fields)
A new field, "manifestData", has been added to the Video node to detect the periods in a DASH manifest before they are played back. One major use case for this is to display ad markers in the trickplay progress bar.
Is there an example of this somewhere? I want to insert a visual indicator of ad breaks in the progress bar.