Avid Technology Digidesign USD User Manual page 56

A window dub can be very helpful for any-
one involved in audio-for-picture, since it
gives you an instant, visual cue as to where
you are in time.
When working with Pro Tools, for in-
stance, you can use a window dub to help
locate a particular video frame that has
been cued by the director for a particular
sound effect. Or, if you're using Pro Tools
and you want to spot a region to the same
video frame at which you've paused your
videotape, you can enter the time code
reading you see in the window dub into the
Auto Spot dialog. (This is especially useful
if your only time code reference from the
tape is LTC, as Auto-Spot requires VITC.)
The USD's character generator obtains its
time code address from the chosen Posi-
tional Reference.
Window Dub Requirements
Existing Video Signal The USD can only
burn a window dub onto an existing video
signal. This means that at least one video
"source" signal (from a VTR, nonlinear ed-
iting system, or other video device) must be
present at one of the USD's video input
connectors (Video In or Video Ref In).
When generating a window dub, the two
VITC Timing and VITC Video Source Rules
apply.
USD Output The signal from the USD's
Video Out connector must be routed to a
video "destination" (such as another VTR
or nonlinear editing system).
52 Universal Slave Driver
To burn a window dub onto a video signal from
Pro Tools:
Choose Setups > Peripherals and display
1
the Synchronization page.
Assuming USD is enabled already, the
2
Window Dub controls should be available.
Configuring USD Window Dub from Pro Tools.
Click Enable Dub Window.
3
Configure the Window burn appearance
4
settings: Size, Vertical Position, Horizontal
Position, and Color. (See "Window Burn
Display Options" on page 53 for details.)
After configuring the dub window set-
5
tings, click OK to close the Peripherals win-
dow.
To configure Window Dub using USD Setup:
In the Dub Window section of USD
1
Setup, select Window Enabled.
Specify the appearance of the window
2
dub with the pop-up menus for Vertical Po-
sition, Horizontal Position, and Color.
(See"Window Burn Display Options" on
page 53 for details.)