4 RES
=$
(xrandr |
grep 'current' |
sed -E 's/.*current\s([0-9]+)\sx\s([0-9]+).*/\1x\2/')
6 ffmpeg
-f x11grab
-video_size $RES -y -i $DISPLAY -i $LOCK -filter_complex "boxblur=5:1,overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2" -vframes 1 $TMPBG -loglevel quiet