My ~/yt-dlp.conf:

    #inicio de fichero
    --format=bestvideo[height<=?480][fps<=?30]+bestaudio/best
     #fin de fichero

My ~/.config/mpv/config

#inicio

      ytdl-format=bestvideo[height<=?480][fps<=?30]+bestaudio/best
      ao=sndio
      vo=gpu,xv
      audio-pitch-correction=no
      quiet=yes
      pause=no
      profile=fast
      vd-lavc-skiploopfilter=all
      #demuxer-cache-wait=yes
     #demuxer-max-bytes=4MiB
     #fin

Usage: mpv $YOUTUBE_URL

Upgrade ASAP.