Bash CLI util to record the screen with VAAPI hardware acceleration. Writes to two audio streams - one with the default input device (microphone), and one with the desktop audio.

rec_screen

#!/usr/bin/env nix-shell
#! nix-shell -i bash -p ffmpeg slop

set -e

output_file="$HOME/Videos/recording_$(date +%Y_%m_%d__%H_%M_%S).mp4"
qp=23

usage() {
  echo "Usage: $(basename $0) [OPTIONS]"
  echo
  echo "Options:"
  echo "  -q QP         Specify the QP value for the H.264 video codec (default: $qp)"
  echo "  -n NAME       Specify the output file name (default: $(basename $output_file))"
  echo "  -d DIR        Specify the output directory (default: $(dirname $output_file))"
  echo "  -o FILE       Specify the absolute output file path"
  echo "  -h            Show this help message"
}

while getopts "q:n:d:o:h" opt; do
  case $opt in
    q) qp="$OPTARG" ;;
    n) file_name="$OPTARG" ;;
    d) output_dir="$OPTARG" ;;
    o) output_file="$OPTARG" ;;
    h) usage; exit 0 ;;
    *) usage; exit 1 ;;
  esac
done

if [ -n "$file_name" ] && [ -n "$output_dir" ]; then
  output_file="$output_dir/$file_name"
elif [ -n "$file_name" ]; then
  output_file="$(dirname $output_file)/$file_name"
elif [ -n "$output_dir" ]; then
  output_file="$output_dir/$(basename $output_file)"
fi

echo "Click a window or drag across an area to select the recording target."
ffmpeg -hwaccel vaapi -hwaccel_output_format vaapi                      \
  -f x11grab $(slop -f '-video_size %wx%h -i +%x,%y')                   \
  -f pulse -i default                                                   \
  -f pulse -i alsa_output.pci-0000_00_1f.3.analog-stereo.monitor        \
  -c:a aac -b:a 128k                                                    \
  -map 0:v -map 1:a -map 2:a                                            \
  -vcodec h264_vaapi -qp $qp                                            \
  -vf 'format=nv12,hwupload' "$output_file"