Screenshot video

#!/bin/bash
#
# Window capture
#
# This captures screenshot sequences of a window.
# The snapshot captures are saved to PNG files.
# When done an NTSC mpeg4 video is created (in an AVI container).
#
# To use, start this script. Use the cross-hair cursor to
# select a window. Every time you press Enter a snapshot
# is captured. Enter q to stop capturing. An AVI video file
# will then be created.
#
# Dependencies: ImageMagick and Mplayer tools
# Based on a script by Chad Files.
#
# Noah Spurrier 2007
#
# TODO Need to check for dependencies:
# TODO mpeg2encode
# TODO mencoder
# TODO xwininfo
# TODO import, convert
#

i=1
echo "Use the cursor and select the window you want to capture."
WINDOW_ID=`xwininfo | grep "Window id:" | awk '{print $4}'`
while [ 1 ]
do
    x=$[i+100000000]; # used to zero pad the filename
    echo "Enter q to stop capturing frames."
    echo -e "Press Enter to capture frame ${x/1/}: \c "
    read RESPONSE
    case "$RESPONSE" in
        [qQ]*)
            break
            ;;
    esac
    # sleep 1
    import +dither -depth 8 -frame -window $WINDOW_ID "${x/1/}.png"
    i=$(( $i + 1 ))
done

# convert PNG sequences to mpeg4 video at 1 frame every two seconds.
#mogrify -antialias -resize 720x486! 0*.png
mencoder "mf://*.png" -mf fps=0.5 -o capture.avi -ovc lavc -lavcopts vcodec=mpeg4

#convert -antialias -resize 720x486! -delay 200 0*.png capture.m2v