the x264 av1 file plays only audio on vlc but works with flaws on mpv: on mpv I get audio and video, but every 5 to 6 seconds it’s like instead of getting 24 fps I get 22, the user noticing the missing frames.

Is this a hardware issue? software?

debian 12.11, vlc 3.0.21 flatpak, mpv 0.40.0 flatpak

what do I do?