Will Catalina stream movies (etc) to a 3rd Generation Apple TV box? I have one of the older, 3rd generation Apple TV boxes, (the sort that came with a clicky remote, not a swipey one). I regularly use it to watch movies and TV shows served up by a Mac currently running High Sierra (I think… might be Mojave), via iTunes with home sharing.

Given that iTunes is a thing of the past in Catalina, will this set up still work if I upgrade the Mac to MacOS 10.15?
If I'm correct, programs like quicktime player, Apple TV and more, offer airplay in the app itself. I know your movies(if bought on itunes), moved to the Apple tv app on your macbook. If you start playing, see the airplay button on the bottom left corner!