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Internal & External Keying
Character generators are devices capable of overlaying text, graphics, and animation
on top of a video stream. The DMP-8000’s keying capabilities allow it to function within
a video production environment as a self-contained character generator for internal
keying or to provide overlay text and graphics to another device downstream for
external keying.
In
, the character generator is taking
video coming from the on-field camera and
combining it with graphics that appear in the
bottom third of the screen. However, this is
just one example of a character-generator
application.
In any situation where a video feed is combined
with text or graphics, a character generator is
responsible for the combination.
Internal Keying
When a DMP-8000 is configured for internal keying (CG Mode), it uses the incoming
video signal as a background and then combines it with any content files that are being
played, allowing the video to appear through any transparent areas of the content.
Video
DMP-8000
Overlay content
Video with overlay
Figure 56:
Internal Keying Process
Triggering Internal Keying
When in internal keying mode, the DMP-8000 will automatically pass through the video
feed connected to the player, so triggering the video with a Venus Media Presentation
Language (VMPL) file is unnecessary.
Overlay content can be created and triggered in the same manner as other content.
When played, the overlay content is rendered on top of the video content, and any
transparent areas in the content are filled with the background video.
Note:
When using the internal keying mode, note that the audio being outputted from
the player is the embedded audio of the passed-through video. The DMP-8000
cannot override an embedded audio file to play back independently selected
audio files.
Figure 55:
Keying Example
Summary of Contents for DMP-8000 Series
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