NewTek TriCaster 8000 - Manual (Page 174)

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8.2.2 ACT AS ALPHA
TriCaster optionally allows one or more neighboring pairs of video inputs to be
combined as a single ‘video + alpha’ channel (sometimes also referred to as “fill and
matte”).
The ability to configure one input as the alpha
channel source for another is absolutely
invaluable for installations employing video
feeds from high end external CG and
chromakeying systems (such as Chyron® and
Ultimatte® ).
To use this feature, select Act as Alpha Channel
for Input (#) as the Connection Type in the Input
Configuration panel for an even-numbered
input.
Note: The input configuration (video format and connection type) for the alpha input is
automatically configured to match the fill source it is paired with.
8.2.3 FRAME SYNC
FIGURE 133 (TRICASTER 8000)
TriCaster internal Frame Sync is enabled for all sources by default, allowing you to
work with a wide array of potential video sources without concerns about video
timing. For TriCaster 8000 (only), it is possible to ensure the very lowest possible
throughput latency for genlocked sources by disabling Frame Sync.
Sources with Frame Sync disabled must be genlocked, and further, must be ‘in phase’
(within 180° of the current switcher output); otherwise, video from the source will
simply not be visible.
In practice, then, disable Frame Sync for your genlocked sources, adjust the Phase
setting (see Section 8.1.2) until video is displayed and you should be all set.
FIGURE 132