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ffmpeg -hide_banner -i "scats.avi" \
       -vf "fps=fps=pal, \
...
            scale=trunc(iw/2)*2:trunc(ih/2)*2 " \
       -y -codec:v libx264 -pix_fmt yuv420p \
       -crf 18 -vsync cfr -r pal "new.avi"

$my_os = "$^O";
if ($my_os eq "linux") {
...
   $font_file = "c\\:\\\\windows\\\\fonts\\\\verdana.ttf";
  
}