Screen cast using ffmpeg and libnotify

screecast.sh

#!/usr/bin/env bash

# SCREENCAST

# USER SETTINGS
OUTPUT="$(xdg-user-dir VIDEOS)/Screencast"
WAITSEC=3

# VARIABLES
SIZE="1366x768"
RATE="23"
VCODEC="libx264"
PIXELS="yuv420p"
PRESET="medium"

if [[ ! -d "$OUTPUT" ]]; then
  mkdir -p $OUTPUT
fi

if [[ $(ps cax | grep -q ffmpeg) ]]; then
  killall -INT -w ffmpeg
fi

# notification - starting
notify-send -t $(($WAITSEC -2)) "Screencast will begin in $WAITSEC seconds"
# pause!
sleep $WAITSEC
SCREENCAST_NAME="$OUTPUT/$(date "+%F.%H-%M-%S")"
# start screencasting losslessly without audio
ffmpeg \
  -f x11grab \
  -s $SIZE -r $RATE -i :0.0 \
  -c:v $VCODEC -tune stillimage \
  -crf 18 -pix_fmt $PIXELS -preset $PRESET \
  -threads 4 -qp 0 \
  -y ${SCREENCAST_NAME}.mp4

# notification - completion
MSG="Screen case ${SCREENCAST_NAME} finished :-)"
echo ${MSG}
notify-send -t 3000  ${MSG}