misc/scripts/rec

#!/bin/sh

record() {
  if test "$1" = "-s"; then
    geometry=$(hacksaw -f 'crop=%w:%h:%x:%y,scale_vaapi=%w:%h')
  else
    geometry='scale_vaapi=1920:1080'
  fi

  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,$geometry:format=nv12" \
    -c:v hevc_vaapi -qp 21 -rc_mode 1 \
    -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