Grass Valley Kayak HD v.6.9.3 - Manual (Page 50)

50 Kayak — User Manual
Section 2 — Concepts
Transition Rate
Cut transitions are instantaneous, but mix and wipe transitions have dura-
tions.
Transition durations can be set in advance to a specific transition rate, and
be initiated by pressing a button on the control panel. It is also possible to
manually control transitions using a lever arm.
On the Kayak system, one transition rate can be assigned to the main tran-
sition of the M/E. This type of transition can be controlled by that M/E’s
lever arm. Each of the four keyers on the M/E can also be assigned its own
transition rate, initiated with a separate
Key Mix button.
Flip Flop Background Buses
At the completion of a transition, the background buses swap their source
selections (flip flop). This makes the upper bus always act as the on-air bus,
and the lower bus act as a preset bus. The operator can reliably setup the
next source on the lower bus without disturbing the source selected on the
on-air upper bus.
For example, if a transition begins with source 1 on Background A and goes
to source 2 on Background B, as soon at the transition to source 2 completes,
source 2 will be taken to the Background A bus (without disturbing the
output of the M/E). The source 1 selection will also be immediately taken
to the Background B bus.
Look Ahead Preview
If a preview monitor is configured for Look Ahead Preview mode, the end
result of the upcoming transition can be viewed on that monitor. This lets
the operator know in advance what will occur for that next transition.
Current and Next Stack
Kayak uses a current and next stack approach for transitions that involve
multiple elements. The current stack is the current M/E output including
any keys that are on. The next stack is defined by the current stack and
whatever next transition elements have been selected. Look ahead preview
always displays the next stack. Next transition elements affecting stacks are
Keys 1 - 4, background, and key priority.
Kayak transitions always occur from the current stack to the next stack.
For example, if the current stack has Key 1 over Background A, and the next
stack specifies Key 2 over Background B, a mix transition will occur
between the composites (Key 1 over A to Key 2 over B). This is different