Daktronics DMP-8000 Series User Manual

Show Control System
38
External Keying
When a player is congured for external keying, it creates and outputs overlay content,
generally referred to as a luma key or linear key. This overlay content is then combined
with a video signal by a downstream device, such as a production switcher.
In this setup, the player does not take in or output video. Instead, it outputs two SDI or HD-
SDI signals. The ll signal contains the graphics and text that will combine with the video,
while the alpha channel, or key signal, contains data that instructs the downstream
device on what parts of the background should be removed to show the video. Refer to
Figure 58.
Video
DMP-8000
Alpha channel
Fill/overlay content
Downstream
device
Video with overlay
Overlay content
Figure 58: External Keying Process
Triggering External Keying
When in external keying mode, the player will automatically output the ll signal and
alpha channel through the appropriate SDI or HD-SDI outputs when the content is
triggered.
Note: Because external keying requires two SDI or HD-SDI outputs, only certain models
are capable of this function.

Daktronics DMP-8000 Series Specifications

General

Brand	Daktronics
Model	DMP-8000 Series
Category	Media Player
Language	English