VLC not playing 4K video

[cscs]

@cscs

whether your BIOS is out of date

@marko1

Type: Desktop Mobo: ASUSTeK model: PRIME X470-PRO v: Rev X.0x
    serial: <superuser required> UEFI: American Megatrends v: 5603
    date: 07/28/2020

Its true
https://www.asus.com/us/supportonly/prime%20x470-pro/helpdesk_bios/

(and quite a lot too … please do the BIOS update)