What is the main function of a video mixer in a production environment?

The primary function of a video mixer in a production environment is to control and switch between video inputs. This device allows operators to select various video sources, such as cameras, video clips, and graphics, and then seamlessly transition between these inputs during a live broadcast or video recording. By facilitating the switching process, the video mixer enables a dynamic and visually engaging presentation, ensuring that the audience receives a coherent and high-quality viewing experience.

In addition to switching video sources, a video mixer often provides additional functions such as basic effects and transitions, but its core responsibility remains focused on managing the flow of video content. The other options describe functions associated with different equipment or activities in the production process, such as audio mixing, storage for editing purposes, and post-production visual effects, which do not fall under the primary role of a video mixer.