mp4 video exported from x265 does not play I use x265 to encode a video and the output is mp4. Unfortunately, this file is not playable by any program.

The input video is yuv if that matters.

Do you know which the problem might be?

Thank you in advance.
It looks like the x265 codec needs to be installed for the App you are using to play the file with.

VLC does support x265 with a dd on codec but it seems the link on there site is broken
https://www.videolan.org/developers/x265.html which is not very useful right now.

there are some other players out there doing a quick Google brought up some results but I dont have a x265 file to play with to test them.

if you exported the file, have you tried exporting it again to see if the same issue happens ?