mpv now has its own support for filtering by filetype

[user-1-2-3-4-5]

https://mpv.io/manual/stable/#options-directory-filter-types

--directory-filter-types=<video,audio,image,archive,playlist>

Media file types to filter when opening directory. If the list is empty, all files are added to the playlist. (Default: video,audio,image,archive,playlist)

https://mpv.io/manual/stable/#options-image-exts
https://mpv.io/manual/stable/#options-video-exts
https://mpv.io/manual/stable/#options-archive-exts
https://mpv.io/manual/stable/#options-playlist-exts

To avoid overlapping functionality, please see if the script's "file format whitelist" is still needed.

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I used to use an mpv LUA script to filter out dozens of non-video/-audio formats (I have another profile for image viewing) — I removed the said script after having used --directory-filter-types=video,audio for a while.