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).

The switcher can be configured to strip or pass this data from the video output. The amount of data, and how it is stripped, depends on the video format of the video signal.

Note: Frame Converters and Synchronizers strip embedded audio data from the video signal.

The following restrictions apply to ancillary data being included in the output:

  • All ME program buses pass ancillary data.
  • MultiViewer outputs do not include any ancillary data.
  • MiniME™ and MultiScreen outputs do not include any ancillary data unless an ME with ancillary data is re-entered onto the background bus.
  • ME Preview does not include ancillary data unless the background is not selected as part of the next transition.
  • A MiniME™ or MultiScreen can include ancillary data if an ME is re-entered onto the background.
  • Any format conversion on the input video signal.
  • Setting ancillary data to be stripped.
Table 1. Last Line of Vertical Ancillary Data
Video Format Normal Strip/Pass Long Strip/Pass
480i 19 21
576i 22 24
720p 25 25
1080i 20 20
1080p 41 41