What is the function of a video scaler in an AV setup?

The primary function of a video scaler in an AV setup is to convert video signals to different resolutions and formats. This capability is essential in environments where various devices with different native resolutions may be used together, such as projectors, displays, and video conferencing systems.

By scaling, the video scaler ensures that the output video looks optimal on the display device being used, allowing for a consistent viewing experience regardless of the source format. It adjusts the resolution, whether that involves upscaling (increasing resolution) or downscaling (decreasing resolution), to match the capabilities of the display device. This process can also involve changing the aspect ratio and other characteristics of the video signal to achieve the best visual quality, making it a crucial component in any AV system where multiple input sources and display standards are present.