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External Keying
When a DMP-8000 is configured 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 DMP-8000 does not take in or output video. Instead, it outputs two SDI or
HD-SDI signals. The fill video contains the graphics and text that combine with the video,
while the alpha channel, or key signal, contains data that instructs the downstream
device on what parts of the background video should be removed to show the fill video.
.
Video
DMP-8000
Alpha channel
Overlay content
Downstream
device
Video with overlay
Overlay content
Figure 57:
External Keying Process
Triggering External Keying
When in external keying mode, the DMP-8000 will automatically output the fill video
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 the
DMP-8000-SDI and DMP-8000-PE models are capable of this function.
Summary of Contents for DMP-8000 Series
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