MxlOutputSettings.ancillaryFrameRate property
Grain rate for this output’s "ancillary" and "subtitle" flows, and the rate their CTA-708 CDPs are written at.
Each flow is its own MXL writer, so a subtitle flow with no video flow beside it has nothing to infer a rate from — set this to the programme’s frame rate in that case, or the flow is published at a rate that does not match the captions it carries. Defaults to the rate of a video flow on this same output, and to 25/1 if there is none.
Signature:
ancillaryFrameRate?: FrameRate;