Grass Valley Karrera Video Production Center v.4.0 - Manual (Page 230)

230 KARRERA — User Manual
Section 7 — Advanced Operations
Though background and keyer transitions are described here as separate
procedures, effects can easily be built that include both background and
key transitions in the same keyframe by selecting the appropriate next tran-
sition element buttons.
E-MEM Transition Rules
Key Priority Transitions interpolate wipes and mixes as part of an E-MEM.
Note When creating a priority transition that will interpolate as part of an E-MEM,
it will only transition correctly if the ‘Next’ Priority Stack on the initial key-
frame is set to match the ‘Current’ Priority Stack of the subsequent keyframe.
• A background transition will occur only when the Bkgd next transition
element is selected on the initial keyframe AND the source selected on
the B bus of the initial keyframe matches the source selected on the A
bus of the following keyframe.
Note The decision to perform a background transition is based on keyframe
values, regardless of the state of Bus or Source Holds. If a Hold is active you
will not be able to tell by looking at the currently selected sources whether a
background transition will occur.
• A keyer transition will occur only when the Key 1-6 background transi-
tion element(s) for the keyers involved are selected on the initial key-
frame AND a keyer changes its on/off state at the following keyframe.
• If Effects Dissolve is on, when an effect is recalled transitions will occur
between the previous switcher state and the first keyframe of the effect,
following the rules above. If Effects Dissolve is off effect recalls will cut
to the first keyframe of the effect.
To Build Background E-MEM Transitions:
When building background transitions make sure the A and B background
bus selections are consistent through out the effect. Otherwise the back-
ground video may cut to different sources when keyframes are encoun-
tered. Plan ahead to the next transition when you create keyframes in an
effect that has multiple background transitions.
1. Go to the keyframe in the effect where you wish the background
transition to begin.
Note Adding new transition keyframes to the end of an effect is the easiest way to
build effects containing background transitions, though using this method is
not required.
2. Select the Bkgd next transition button.
3. Select the type of transition ( Mix , Wipe 1 , or Wipe 2 ).