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Windows XP
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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 file. These lines are then inserted back
into the video blanking when the file 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 AATON™
equipped telecine suites, feature audio timecode and keycode information along
with the normal timecode numbers.
Genlock
Genlock, also known as black burst or house sync is used to lock different
pieces of equipment to the same timing throughout a facility. When two or more
video devices are connected to the same sync signal, their video signals can be
switched without jumping or rolling. This is critical when more than two devices
are connected at the same time.
DeckLink and DeckLink HD cards are designed for direct connection to video
decks, and as such, do not have genlock connections. When using these or
any other Decklink cards directly with a deck, the deck can be synced to the
video signal coming from the Decklink card. The Blackmagic Decklink System
Preferences can set to provide a stable black signal to the deck during capture
operations, as found in Control Panels in Windows™.
All other SD DeckLink cards can be connected to standard bi level sync for
genlock. This standard composite video signal needs to be stable, which is why
we recommend a specific signal generator like a blackburst generator.
All other
HD DeckLink cards need to be connected to tri level sync when in HD mode,
to correctly lock. If these cards are running in SD mode then a standard bi level
sync can be used.
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