Script that records the area of a window clicked by the user. Requires ffmpeg with Xcb enabled.

record.sh

#!/usr/bin/env bash

window_info=$(xwininfo)

x=$(echo "$window_info" | grep "Absolute upper-left X" | awk '{print $4}')
y=$(echo "$window_info" | grep "Absolute upper-left Y" | awk '{print $4}')
width=$(echo "$window_info" | grep "Width" | awk '{print $2}')
height=$(echo "$window_info" | grep "Height" | awk '{print $2}')

if [ -z "$x" ] || [ -z "$y" ] || [ -z "$width" ] || [ -z "$height" ]; then
    echo "Failed to get window geometry."
    exit 1
fi

timestamp=$(date +"%Y-%m-%d %H:%M:%S")
output_file="$HOME/Videos/${timestamp}.mp4"
# Run ffmpeg to record the selected window
ffmpeg -video_size "${width}x${height}" -framerate 25 -f x11grab -i ":0.0+${x},${y}" "$output_file"