Instruction manual

19
Blackmagic Software
Setting Blackmagic Preferences
Preserving Blanking Data or VANC
This feature lets you use up to 3 video lines at the top of a captured movie file to store any 3 lines
from vertical blanking. This allows 3 line timecode, VITC (vertical interval test signals) subtitle info or
any other VANC data to be preserved during capture. These lines are then inserted back into the
video blanking when the file is played back.
To preserve VANC data:
1. Open the DeckLink control panel.
2. Select the VANC and 3:2 Pulldown tab and tick the On check box for video line 1, 2 or 3
depending on how many blanking lines you want to capture.
Note: Video file line 1 needs to be enabled for lines 2 and 3 to work.
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.
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, featuring audio
timecode and keycode information along with the normal timecode numbers.
VANC preferences.
Blackmagic Software