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#!/bin/sh
# useful urls:
# https://github.com/LukeSmithxyz/voidrice/blob/master/.local/bin/dmenurecord
# https://wiki.archlinux.org/title/FFmpeg#Screen_capture
# https://trac.ffmpeg.org/wiki/Capture/Desktop
infofile="/tmp/recoinfo"
recodir="$XDG_VIDEOS_DIR/recordings/"
tmpdir="$recodir/tmp/"
mkdir -p "$recodir" "$tmpdir"
if [ -e "$infofile" ]; then
read -r pid tmpfile < "$infofile"
kill "$pid"
notify-send 'finish recording, start converting'
ffmpeg -i "$tmpfile" "$recodir/$(time-uuid).mkv"
notify-send 'finish converting'
rm "$tmpfile" "$infofile"
else
tmpfile="$tmpdir/$(time-uuid).mkv"
# arch wiki way, no audio, less cpu use during capturing (fast?), large file size, need convert afterward
{
case "$1" in
# fullscreen
'-f')
printf '%s %s 0 0' "$SCR_WIDTH" "$SCR_HEIGHT"
;;
'')
notify-send 'select recording region with mouse'
xrectsel '%w %h %x %y'
;;
*) exit 1;;
esac
notify-send 'start recording after 2 seconds'
sleep 2
dunstctl close-all
} | xargs sh -c 'ffmpeg -y -loglevel quiet -f x11grab -framerate 25 -s "$2x$3" -i "$DISPLAY+$4,$5" -c:v ffvhuff "$1" & echo $!' shell "$tmpfile" | xargs -I {} printf '%s\t%s' '{}' "$tmpfile" > "$infofile"
# another way to get subshell ffmpeg child pid
#xrectsel '%w %h %x %y' | xargs sh -c 'ffmpeg -y -f x11grab -framerate 25 -s "$2x$3" -i "$DISPLAY+$4,$5" -c:v ffvhuff "$1"' shell "$tmpfile" &
#printf '%s\t%s' "$(ps -o pid= --ppid $!)" "$tmpfile" > "$infofile"
fi
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