In a studio production, which device is used to switch between multiple video sources?

• A. Mixer
• B. Switcher
• C. Router
• D. Encoder

Answer: (B)

Selecting between multiple video sources in real time is what a video switcher does in a studio. The switcher acts as the control point that lets the director or technical director choose which input—such as cameras, playback devices, or graphics—appears on the program feed, often with transitions like cuts, dissolves, or wipes. It outputs a single active video signal to air or streaming, while managing timing and clean transitions between sources.

A mixer is focused on audio levels and sources, not video switching. A router moves signals to different destinations but doesn’t provide the live on-air switching and transitions used to select among video inputs. An encoder converts video into a digital stream or file; it doesn’t perform the function of choosing between sources for the live output.