It's not possible to rotate a video directly in Windows Media Player, but here are two other ways you can rotate a video in Windows 10.

In an ideal world, all the clips you use to put together videos are just the way you want them. Problems happen, though, and even a simple problem such as the person who was filming holding the camera ...

You can rotate a video on your iPhone or iPad using the crop tool in the Photos app.

You can use a GUI-based software to rotate multiple videos at once. Here, I am going to use this free software called XMedia Recode. It is a free video converter and editor software for Windows 10.