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[ghost]

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[Euro20179]

Even if I create script directly in /usr/bin/yt-dlp_to_mpv with yt-dlp -o - $1 | mpv -, and add video_player="yt-dlp_to_mpv" to my ~/.config/ytfzf/conf.sh

overriding video player this way doesn't work, you have one of 2 options
either put

video_player () {
    yt-dlp -o - $1 | mpv -
}

or

load_url_handler "/usr/bin/yt-dlp_to_mpv"

in your ytfzf config

The difference in this situation is minor, but basically video_player is used by the builtin url handler, whereas load_url_handler will override the builtin url handler