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the keyer, we have to be a bit tidier. We need to assign a full field white key signal to any video source
that doesn’t specifically have an associated key signal. Pick an item from the left table that isn’t going to
have a dedicated key signal (like a camera) and perform the same procedure as above, except this time
look for the source WHITE in the right table (as of software version 12, it is source 90).
This will tell the keyer that the keyed video should replace the background completely whenever it’s
keyed. Don’t worry, if a bona fide video with matching key is on the keyer, both the keyer and the DME
will pass the true key signal, too.
The Main V/K Pair Assign area we are in is typically only accessed by engineers and not TDs, or switcher
operators. Once this section is setup, it is rarely touched unless something changes in the way the
switcher is actually wired – just like the back of the patch panel. However, the operators need to be
able to freely change where inputs appear on crosspoint buttons of the switcher. Therefore, there is
another section that allows this without changing video/key pair assignments. This section is analogous
to the front of the patch panel. It is quite normal for someone to make a patch on the front, but
unheard of to keep changing the “normal through” wiring on the back of the patch panel just to get a
different source patched. This same scenario works in setting up MVS.
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