AV1 is a video codec rated to enhance file compression compared to its current alternatives. Google has become its a major proponent, to the extent that it is now reportedly insisting that manufacturers need to have it enabled in devices with compatible SoCs if they want to use the Android 10 for TV interface.
https://www.notebookcheck.net/Google-is-pushing-Android-TV-hardware-makers-to-adopt-the-AV1-codec-in-2021.515476.0.html