Because these lines can be passed to the application, a developer could write
software to read the VANC data and use it for various purposes, e.g. 3-line
timecode and audio chasing, or other uses. This feature has unlimited uses!
You can use this feature with software, such as Deck Emulator software, to
create a disk recorder that captures and preserves on playback 3-line timecode
in telecine suites etc.
How the VANC Feature Works
This feature allows you to preserve lines of VANC in the vertical blanking and
store them into lines 1 to 3 of the video le. These lines are then inserted back
into the video blanking when the le is played back.
You can select to hide these lines from the application so they don’t look ugly,
or to let them be passed to the application if you are running software that
interprets this data.
An example of VANC data is 3-line timecode, which uses lines 18, 19, and 20
in NTSC or lines 19, 20 and 21 in PAL. 3-line timecode, as used in AATONTM
equipped telecine suites, feature audio timecode and keycode information along
with the normal timecode numbers.
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