recordwin.zsh

#!/usr/bin/env zsh
f="${1-$$.mkv}"
rate=30
echo "Click a window to record.."
coords=( $(xwininfo | awk '/Absolute upper-left [XY]:/ {print $4} /Width:|Height:/ {print $2}') )
sleep 0.1
aopts=(-f alsa -rtbufsize 1M -thread_queue_size 64 -i default)
#aopts=(-f pulse -i default)
#aopts=()
ffmpeg -s $((coords[3]/2*2))x$((coords[4]/2*2)) -r $rate -f x11grab -show_region 1 -i ${DISPLAY}+${coords[1]},${coords[2]} $aopts -c:v libx264 -pix_fmt yuv420p -qp 0 -tune zerolatency -preset ultrafast -y $f
#ffmpeg -s ${coords[3]}x${coords[4]} -r $rate -f x11grab -i ${DISPLAY}+${coords[1]},${coords[2]} -c zlib out.mkv
if false
then
    cd $(mktemp -d)
    ffmpeg -i out.mkv '%4d.png'
    echo -n "Press enter to make gif"
    read
    convert -delay $((100/rate)) -layers optimize *.png out.gif
    echo "$(pwd)/out.gif"
    echo "Press enter to remove temp files"
    read
    rm *.png out.mkv
    echo "$(pwd)/out.mkv"
fi
echo $f