Me contribution information – Grass Valley Switcher Products User Manual
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Switcher Products — Protocols Manual
Section 1 — Tally Protocol
ME Contribution Information
Kalypso systems have up to 4 MEs. Each ME has 12 input buses (4 video/
key pairs, 2 backgrounds and 2 utility buses), 4 program outputs (PGM A
– PGM D) and two preview outputs. PVW A is always associated with
PGM A. PVW 2 is selectable as the preview for PGM B, C or D. Preview
output contribution depends on the preview mode selected and active
keyer “hold to previews” or “show keys”. Contribution information is pro-
vided for all six real outputs and for the look-ahead state of the four
program outputs. “LAP” contribution always indicates what the program
contribution information would be following a main transition.
Zodiak system MEs have only one utility bus, and only one program and
one preview output. Contribution information for these will be generated,
but none will be generated for utility 2 which is not present. Contribution
information for missing inputs and outputs will always be false.
On a Zodiak 2.5-ME system, PGM PST-DSK has three downstream keyers
and no utility buses, and two program and two preview outputs. Zodiak
PGM PST-DSK is reported as Pgm-Pst. It will only report keys 1-3 as con-
tributing to the composite, and only show PGM A and B outputs active. ME
3 is not active.
On a Zodiak 3-ME system, PGM PST feeds the downstream keyer and is
reported as ME 3. The DSK is reported as Pgm-Pst, and has three down-
stream keyers, no utility buses, and no B bus. The DSK has two program
and two preview outputs.
The Keyer buses “in use” flags indicate whether or not the cut and fill
would be visible if the keyer was contributing to an output. The Contribu-
tion flags indicate whether or not the keyer contributes to the output. These
flags need to be combined (ANDed) to determine if a keyer cut or fill bus is
actually contributing to the output. This was done to limit size of the
message without eliminating information.
The source information indicates which source is feeding the ME inputs.
These may be primary sources or reentries. Sources and in use flags apply
to all outputs from an ME, but contribution information may be different
for each output. Refer to
.