MP4 videos don't work (startup movies)

Hi! I’m trying to use video files (mp4) I have tried both using the Movies> Startup Movies section in the editor, checking the two boxes and selecting the file name (located in Content/Movies directory). When playing using the “Standalone Game” button it only goes black for a few seconds. Without showing anything.

I thought that maybe it was a problem with this option but with the Async Preloader Screen plugin (it allows you to add videos at the beginning as well). The same problem! A few seconds in black.

I have spent hours changing resolutions 1080p, 1088p, 1072p, 720p … the frames per second 60,30, 25 … I have tried h.264, etc. Always the same.

Also tried to do another new project, I’m using 4.26.2 in case I had compatibility bugs or something. The same thing happens in a new project.

Does anyone know how I can fix this?

Thank you :slight_smile:
Have a nice day