The Media Player is getting an update as soon as tomorrow for you to watch 4K videos if you own a PS4 Pro. This allows you to watch 4K videos saved on your USB device.
The PlayStation Blog posted: “Starting tomorrow, the Media Player app is getting an update to support 4K video playback on PS4 Pro. Following this update, 4K videos in mp4 format saved on a USB stick or home server can be played on the Media Player app (remember, you’ll also need a 4K compatible TV to watch the videos in 4K).”
It’s worth mentioning this only works if you are using a separate USB device that’s not used as an external storage for the PS4. This new update also allows you to watch 4K videos via PlayStation VR too.
If you have a Pro, select content on Netflix and YouTube also allow you to watch 4K videos. It’s worth mentioning the PS4 Pro still does not support 4K Blu-ray playback. Only non physical/digital 4K videos are supported thus far.