I haven’t been able to find a timelapse tool that works on OSX yet (Chronolapse runs, but doesn’t seem to start grabbing screencaps?), but as it turns out, it’s very easy to write a script to do this:

while true ; do sleep 60 && echo `date`‘ Capturing screenshot…’ && screencapture -C -m -t jpg -x -f cap.`date +%s`.jpg ; done

I’ve put the script here in my LD project on github: http://github.com/newobj/ludumdare/blob/master/tools/osx-screencap.sh

Just run this guy and you will start getting cap.*.jpg files in the current directory every 60 seconds. They’ll sort chronologically, which is necessary for compiling them into a movie.

When you’re done and have your mountain of JPG’s, you can use Time Lapse Assembler to turn them into a movie (it will also scale them down!)

If anyone knows of a better solution than this for OSX, please enlighten me.