#!/bin/sh

# record: Record an mp4 video using ffmpeg. By default it will output the
# video to './out.mp4'. Requires ffmpeg to be built with Xcb support on NixOS.
# Screen resolution can be specified, but defaults to 1080p.

die() { echo "$0: $*" >&2; exit 1; }
try() { "$@" || die "cannot $*"; }

while getopts ":r:h" args; do
  case "$args" in
    r) RESOLUTION="$OPTARG" ;;
    h) die "record [-r RESOLUTION] FILE" ;;
    *) die "-$OPTARG is not an option." ;;
  esac
done
shift $((OPTIND - 1))

FILE="${1:-out}"
: "${RESOLUTION:=1920x1080}"

try ffmpeg -y -f x11grab -s "$RESOLUTION" -framerate 60 -i :0.0 -f alsa \
           -i default -nostats -hide_banner -loglevel quiet "${FILE}.mp4"