#!/bin/sh

record() {
  sleep 2
  withcap sys_admin -- ffmpeg -f alsa -i recorder \
    -vaapi_device /dev/dri/renderD128 -f kmsgrab -i - -r 60 \
    -vf 'hwmap=derive_device=vaapi,scale_vaapi=w=1920:h=1080:format=nv12' \
    -c:v hevc_vaapi -qp 21 \
    -c:a libopus -b:a 96k -ac 2 -ar 48000 \
    -y recording.mkv >/dev/null 2>&1
}

if test ! -f recording.mkv; then
  echo recording in 2s...
  record &
else
  pkill ffmpeg
  echo stopped recording
fi