Ancillary Data
Ancillary data is information such as closed captioning or embedded audio that is included in the non-active video portions of the video signal. These portions include the Horizontal Ancillary Data Space (HANC) and Vertical Ancillary Data Space (VANC).
Note:
Only ME and MiniME™ program/background busses pass VANC data in HD. All other ancillary data is stripped.
