Ops 4–14 • Switcher Basics Vision Operator’s Manual (v12.0 MD)
Video Preview
Video preview allows you to use an additional monitor to preview what the next shot is going to
be. The preview for an MLE shows what is selected for the next transition on that MLE. This
includes the keys and background video sources that will be on-air after the next transition.
In addition to the preview of the next shot, preview overlay elements, such as a timeclock, safe
title and source ID, can be put up over the preview output. These elements are only visible on the
preview with overlay output.
Preview Module
The Preview Module (Figure 4.11) allows you to select which MLE you are previewing, and
either the Program or Preview of that MLE. In addition to the preview of an MLE, you can also
assign a single video source to a button on the Preview Module, allowing you to bring that
source up on the preview without selecting it for the next transition.
The Preview Module controls the preview output of the highest number MLE in the switcher. If
your control panel does not have that MLE assigned to it, the Preview Module on your control
panel does not affect the preview output of the switcher.
On the Vision 1, the Preview Bus and Preview Overlay functions are located on the same
module (Figure 4.12).
Figure 4.11 Preview Module — Vision 4 Control Panel
Figure 4.12 Preview Module — Vision 1 Control Panel
The buttons on the Preview Module are as follows:
• MLE X — These buttons allow you to select which MLE you want to assign to the
preview output, where X represents the number of the MLE. When you select an MLE,
you must select either the PV or PGM to assign that signal to the preview.
• +4 — This button, in combination with the MLE X button, selects an MLE over MLE 4.
For example, to select MLE 6, toggle +4 on and press MLE 2.
• SRC — This button can be programmed to assign a specific video source to the preview.
Refer to the section “Assigning a Source to the SRC Button” on page Ops 4-15 for
more information.
• PV — This button assigns the Preview output of the selected MLE to the preview output.
For the Vision 1, the PV button shows the main Preview output of the switcher.
• MLE PV — (Vision 1 only) This button assigns the Preview output of the selected MLE
to the preview output. The MLE is selected from the Preview Overlay Menu.
• PGM — This button assigns the Program output of the selected MLE to the preview
output. For the Vision 1, the PGM button shows the main Program output of the switcher.
• MLE PGM — (Vision 1 only) This button assigns the Program output of the selected
MLE to the preview output. The MLE is selected from the Preview Overlay Menu.
P
REVIEW
PGMSRC PVMLE 4 +4MLE 3MLE 2MLE 1
O
VERLAY
HIDE
OVLY
P
REVIEW
SRC MENUPGM
MLE
PGM
MLE
PV
PV
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