Record your multihead OpenBSD desktop (probably some assembly required)

screen-record.ksh

#!/bin/ksh

# Help message
usage() {
    echo "Usage: $0 [-s screen] [-l] [-h]"
    echo "  -s screen   Select screen number (0, 1, 2, etc.)"
    echo "  -l         List available screens"
    echo "  -h         Show this help message"
    exit 1
}

# Function to list screens with xrandr
list_screens() {
    echo "Available screens:"
    xrandr --listactivemonitors | tail -n +2 | nl -v 0
}

# Function to get screen geometry for a given screen number
get_screen_geometry() {
    screen_num=$1
    echo "Debug: Looking for screen $screen_num"
    
    # Get the selected monitor line
    monitor_info=$(xrandr --listactivemonitors | tail -n +2 | sed -n "$((screen_num + 1))p")
    echo "Debug: Monitor info: $monitor_info"
    
    if [ -z "$monitor_info" ]; then
        echo "Error: Screen $screen_num not found" >&2
        exit 1
    fi

    # Get raw dimensions from xrandr --listmonitors (which shows actual pixels)
    raw_info=$(xrandr | grep -A1 "^Screen" | tail -n1)
    echo "Debug: Raw screen info: $raw_info"

    # First try to get current resolution from xrandr output
    current_mode=$(xrandr | grep -A1 "^$(echo "$monitor_info" | awk '{print $3}')" | grep -v "^--" | grep "*" | awk '{print $1}')
    echo "Debug: Current mode: $current_mode"

    if [ -n "$current_mode" ]; then
        SCREEN_WIDTH=$(echo "$current_mode" | cut -d'x' -f1)
        SCREEN_HEIGHT=$(echo "$current_mode" | cut -d'x' -f2)
    else
        # Fallback to parsing from monitor_info
        SCREEN_WIDTH=$(echo "$monitor_info" | awk '{print $3}' | cut -d'/' -f1)
        SCREEN_HEIGHT=$(echo "$monitor_info" | awk '{print $3}' | cut -d'x' -f2 | cut -d'/' -f1)
    fi

    # Extract offsets
    SCREEN_OFFSET_X=$(echo "$monitor_info" | awk '{print $3}' | sed 's/.*+\([0-9]*\)+.*/\1/')
    SCREEN_OFFSET_Y=$(echo "$monitor_info" | awk '{print $3}' | sed 's/.*+[0-9]*+\([0-9]*\)/\1/')

    echo "Debug: Parsed values:"
    echo "Width: $SCREEN_WIDTH"
    echo "Height: $SCREEN_HEIGHT"
    echo "Offset X: $SCREEN_OFFSET_X"
    echo "Offset Y: $SCREEN_OFFSET_Y"

    # Verify we got valid numbers
    if [ -z "$SCREEN_WIDTH" ] || [ -z "$SCREEN_HEIGHT" ] || \
       [ -z "$SCREEN_OFFSET_X" ] || [ -z "$SCREEN_OFFSET_Y" ]; then
        echo "Error: Failed to parse screen dimensions" >&2
        exit 1
    fi
}

# Initialize variables
SCREEN=""
SCREEN_WIDTH=""
SCREEN_HEIGHT=""
SCREEN_OFFSET_X=""
SCREEN_OFFSET_Y=""

# Parse command line options
while getopts "s:lh" opt; do
    case $opt in
        s)
            SCREEN=${OPTARG}
            get_screen_geometry "$SCREEN"
            ;;
        l)
            list_screens
            exit 0
            ;;
        h)
            usage
            ;;
        *)
            echo "Invalid option: -$OPTARG" >&2
            usage
            ;;
    esac
done

# If no screen specified or geometry not set, show usage
if [ -z "$SCREEN" ] || [ -z "$SCREEN_WIDTH" ]; then
    echo "Error: No screen selected or screen geometry not found" >&2
    usage
fi

# Get current timestamp
NAME=$(date '+%Y-%m-%d_%H%M%S')

echo "Recording screen $SCREEN (${SCREEN_WIDTH}x${SCREEN_HEIGHT} at offset ${SCREEN_OFFSET_X},${SCREEN_OFFSET_Y})"


ffmpeg -hwaccel vaapi -vaapi_device /dev/dri/renderD128 \
    -f sndio -thread_queue_size 1024 -i snd/0.mon \
    -f sndio -thread_queue_size 1024 -i snd/1 \
    -f x11grab -thread_queue_size 1024 -probesize 32 -draw_mouse 1 \
    -video_size ${SCREEN_WIDTH}x${SCREEN_HEIGHT} -r 30 \
    -i :0.0+${SCREEN_OFFSET_X},${SCREEN_OFFSET_Y} \
    -filter_complex "\
        [0:a]volume=4.0,pan=stereo|c0=c0|c1=c1[desktop];\
        [1:a]volume=3.0,acompressor=threshold=0.125:ratio=4:attack=200:release=1000,dynaudnorm=f=10:g=3:p=0.9,pan=stereo|c0=c0|c1=c1[mic];\
        [desktop][mic]amix=inputs=2:duration=first[aout]" \
    -map 2:v \
    -map '[aout]' \
    -c:v h264_vaapi \
    -vf 'format=nv12|vaapi,hwupload' \
    -qp 0 \
    -c:a flac \
    -b:a 160k \
    -ar 48000 \
    -ac 2 \
    -fps_mode cfr \
    -async 1 \
    -flags +low_delay \
    -fflags +nobuffer \
    -y \
    "$HOME/Videos/$NAME.mkv"

echo "Recording started in $HOME/Videos/$NAME.mkv"