[OS X] Scriptable Graphic Program that can export pictures as a slideshow

Hey,
Do you know of any program for OS X that is scriptable, preferably from Python, and can be used to export a bunch of pictures as a slideshow? Right now I tried Graphic Converter.
However, I don't know how to make a script to like:
1) Open a folder in a directory, take all the picture files, export as a movie. The filename of the movie should be the name of the folder that the picture files are in.
2) Open another folder in same directory and repeat process as expained in step #1.
Preferably this script should be able to be called from Python.

-Thank you very much for your help. Really stuck here.