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Vision mixer
Electronic device for selecting and compositing of live video sources / From Wikipedia, the free encyclopedia
A vision mixer is a device used to select between different live video sources and, in some cases, compositing live video sources together to create visual effects.
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In most of the world, both the equipment and its operator are called a vision mixer or video mixer; however, in the United States, the equipment is called a video switcher, production switcher or video production switcher, and its operator is known as a technical director.
The role of the vision mixer for video is similar to what a mixing console does for audio. Typically a vision mixer would be found in a video production environment such as a production control room of a television studio, production truck or post-production facility.