Values.AncillarySourceSettingsSourceSettings for ancillary captions source.
type nonrec t = {convert608To708 : AncillaryConvert608To708.t option;Specify whether this set of input captions appears in your outputs in both 608 and 708 format. If you choose Upconvert, MediaConvert includes the captions data in two ways: it passes the 608 data through using the 608 compatibility bytes fields of the 708 wrapper, and it also translates the 608 data into 708.
*)sourceAncillaryChannelNumber : int option;Specifies the 608 channel number in the ancillary data track from which to extract captions. Unused for passthrough.
*)terminateCaptions : AncillaryTerminateCaptions.t option;By default, the service terminates any unterminated captions at the end of each input. If you want the caption to continue onto your next input, disable this setting.
*)}