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.
Normal
The normal direction applies the DVE effect on program, revealing
the preview channel.
Reverse
Reverse changes the direction so that the DVE effect is applied on the preview
channel. In the case of reverse, program is covered by a DVE effect with the
preview video.
FlipFlop
When FlipFlop mode is toggled on, the transition changes between normal and
reverse every time the transition is executed.
DVE key parameters
Enable key
Enables/disables the DVE key. The DVE key is enabled when the button
is illuminated.
PreMult
Selects 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, on the advanced panel the DVE button will be
disabled. 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 graphic transition is a popular transition that uses the DVE and moves a graphic across the
screen over a background transition. For example, the graphic wipe moves a graphic over a
horizontal wipe, essentially replacing the wipe border. A graphic mix spins the graphic across
the screen over a mix transition. Graphic transitions are perfect for wiping the station logo or
spinning a football across the screen revealing a new background. Graphic 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
graphic transitions.
The above image sequence provides an example of the program output for a graphic wipe transition.
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Operating your ATEM Switcher