User's Manual
DVE transition parameters
DVE Rate The duration of the DVE transition in seconds and frames. Rotate the DVE rate
knob to adjust the DVE transition rate. The new rate is immediately displayed in
the transition rate window in the transition control block.
Symmetry Symmetry can be used to control the aspect ratio of the pattern.
For example, adjusting the symmetry will allow you to change a circle into an
ellipse. On the broadcast panel symmetry can be adjusted using the z axis of
the joystick.
Position If the wipe pattern has positioning then the joystick on the broadcast panel or
the x position: and y position: boxes in the transition palette of the software
control panel can be used to move the center of the pattern. Moving the
joystick dynamically updates the x and y position display in the software
control panel.
Normal The normal direction for closed patterns such as circles, diamonds and boxes
is to grow from the center of the screen and progress outward.
DVE key parameters
Enable key Enables/disables the DVE key. The DVE key is enabled when the button is
illuminated.
PreMult Select the DVE key as a pre-multiplied key.
Clip The clip level adjusts the threshold at which the key cuts its hole. Decreasing
the clip level reveals more of the background. If the background video is
completely black then the clip value is too low.
Gain The gain adjustment electronically modifies the angle between on and off
thereby softening the edges of the key. Adjust the gain value until the edge
softness is desirable but the background video luminance (brightness) is not
affected.
Inverse When the key is not pre-multiplied, inverts the key signal.
Sharing DVE resources
ATEM features a DVE channel which can be used to perform DVE transitions or used in an
upstream keyer. When you select a DVE transition, if the DVE is used elsewhere in the system,
the DVE transition type will not be available and a DVE unavailable message will be displayed.
In order to use the DVE transition you must free the DVE from where it is currently used. Verify
that the upstream keys currently on program or preview are not DVE keys and do not have
flying key enabled. To free DVE from the upstream keyer, change the key type to anything
other than DVE or disable flying key. The DVE will be released and therefore available for use
as a DVE transition.
The logo wipe transition is a popular transition that uses the DVE and moves a graphic across
the screen over a background transition. For example, the logo wipe moves a graphic over a
horizontal wipe, essentially replacing the wipe border. A logo mix spins the graphic across the
screen over a mix transition. Logo transitions are perfect for wiping the station logo or spinning
a football across the screen revealing a new background. Logo transitions use a special keyer
built into the transition block, leaving all of the upstream and downstream keyers available for
compositing the output. The following section explains how to build and perform
logotransitions.
The above image sequence provides an example of the program output for a graphic wipe transition.
115Using ATEM Hardware Panels