Watching 4k content on 4.5k or 5k displays.

[Apple2GS]

Is there a way to watch 4k Apple TV content or browser based videos, like YouTube, in native resolution on a Mac? Most content is stretched to fit the display, so full screen mode will be 5k on an Apple Studio or 4.5k on a 24" iMac.

 

[CubeApril]

The native video applications (like VLC) should default to the native resolution, but I don't know if there's any obvious way to do that on YouTube and the like, aside from using `youtube-dl`.