Why when casting are images elongated?

[comandoed]

Am using Windows 10 on my desktop pc and casting to my LG OLED65E6P.

I have a number of mkv and mp4 video files and when I cast them to my tv
some of them, about 2 or 3 out of 20, the image that results on my tv is elongated.

Why? How can I correct this? That same file when I play it on my pc with Media Player Classic shows the correct aspect ratio.

The one am doing right now is an mp4
Width : 1 920 pixels
Height : 804 pixels
Display aspect ratio : 2.40:1
Frame rate mode : Variable
Frame rate : 23.976 (24000/1001) FPS

[Cornucopia]

Your casting software doesn't understand adjustment for intended display aspect ratio. Plus, you've already hurt your material by removing the letterboxing.

Scott

[comandoed]

The casting software, in this case, would be Windows 10? Can anything be done to Windows 10 to cause it to adjust to widescreen?