#!/bin/bash

ffmpeg=$(which ffmpeg)

fps=25

# Get the coordinates of the active window's
#    top-left corner, and the window's size.
#    This excludes the window decoration.
  unset x y w h
  eval $(xwininfo -name FlightGear |
    sed -n -e "s/^ \+Absolute upper-left X: \+\([0-9]\+\).*/x=\1/p" \
           -e "s/^ \+Absolute upper-left Y: \+\([0-9]\+\).*/y=\1/p" \
           -e "s/^ \+Width: \+\([0-9]\+\).*/w=\1/p" \
           -e "s/^ \+Height: \+\([0-9]\+\).*/h=\1/p" )
  echo -n "$x $y $w $h"
#

# Get the window resolution
window=$(xwininfo -name FlightGear| grep 'geometry' | awk '{print $2;}' | sed 's/+\(.*\)//')

# Start the recording
$ffmpeg -f x11grab -s $window -r $fps -i :0.0+$x,$y -sameq $1