Why does iTunes show that my movie isn't 4k? Also, can I play the HD movie on a 4k monitor and have it be played in 4k?

There isn't any way to view videos in iTunes on Windows that are 4k. The highest you're able to view is 1080p (HD). I have a 4k (3840 x 2560) monitor and a 4k TV connected to my PC and there isn't an option anywhere within iTunes to view 4k videos.

Here is what I see in iTunes for video playback settings.

Here's a movie that is 4k but only shows up in iTunes as HD.

And here are the settings on my computer that show the resolution is set to 4k.

Here’s a link on which devices are compatible to watch 4K content through iTunes: https://support.apple.com/en-us/HT207949#what_content

Hi!

Here are some scenarios:

If the display is 4K (3840 x 2560) but the video is HD (1920 x 1080), it will display in HD.

If the display is HD, but the video is 4K, it will display in HD.

If the display is 4K and the video is 4K, it will display in 4K.

Regards,

Richard

If the video is 4K, but the screen is 3K, you will only see the 3K.

Generally not. It’s kind of how iTunes works... a little unfortunate.

I recommend you contact Apple Support directly though to see if there’s something they can do.