Adapting http://www.carbonsilk.com/development/timelapse-video-mac/

captureme.sh

#!/bin/sh

#short circuit if screensaver is running
/usr/sbin/lsof /System/Library/Frameworks/ScreenSaver.framework/Versions/A/Resources/ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine && exit

CAPTURE="/opt/local/bin/isightcapture -t jpg"
cd $HOME/Documents/captures
D1=`date +%y%m%d/%H`
D2=`date +%y%m%d.%H%M%S`

# If the date directory does not exist, create it
if [ ! -d $D1 ] ; then
    mkdir -p $D1
fi

# Construct the filename and path and capture a pic
FN="$D1/$D2.jpg"
$CAPTURE $FN

# Make a symlinked image of the last photo taken
if [ -h 'last.jpg' ] ; then
    rm last.jpg
fi
ln -s $FN last.jpg

make_complete_sequence.sh

#!/bin/sh
COUNTER=0;
DIR=$HOME/Documents/captures
rm $DIR/series/*.jpg
for i in `find $DIR -name '*.jpg'` ;
do
#Write the filename to be friendly with ffmpeg's odd filename input
FILENAME=`printf '%03d.jpg' $COUNTER`
cp $i $DIR/series/$FILENAME
let COUNTER=COUNTER+1;
done
name="$DIR/videos/timelapse-overall.mp4"
nice /opt/local/bin/ffmpeg -y -r 20 -b 64k  -i $DIR/series/%3d.jpg $name

make_daily_sequence.sh

#!/bin/sh
COUNTER=0;
DIR=$HOME/Documents/captures
rm $DIR/series/*.jpg
for i in `find $DIR -newerBt '1 day ago' -name '*.jpg'` ;
do
#Write the filename to be friendly with ffmpeg's odd filename input
FILENAME=`printf '%03d.jpg' $COUNTER`
cp $i $DIR/series/$FILENAME
let COUNTER=COUNTER+1;
done
name="$DIR/videos/timelapse-`date +%Y-%m-%d`.mp4"
nice /opt/local/bin/ffmpeg -y -r 20 -b 64k  -i $DIR/series/%3d.jpg $name
ln -sf $name $DIR/videos/latest.mp4