Airflow can stream full 4K HDR HEVC files to Chromecast Ultra, Built-in, Apple TV 4K and AirPlay 2 enabled TVs. It will go out of its way not to touch the original video stream unless absolutely needed for compatibility reasons, ensuring the best possible video quality with the lowest CPU load (your computer fans will thank you). This is not yet another FFmpeg wrapper like you might have seen elsewhere. Airflow's custom-built video processing pipeline goes way beyond wrapping FFmpeg and calling it a day. Airflow can handle pretty much any video format and codec you throw at it. And for those pesky videos that are incompatible with your device - Airflow will handle that transparently, with hardware-accelerated transcoding if your computer supports it.
Softpedia: "All in all, this software solution can help you play your favorite videos and songs on a Chromecast or an Apple TV device without any trouble while also providing you with several customization options."