MoviePrint - Betaversion - feel free to give feedback

Hallo
This is my first App (for OSX 10.7+) I developed with openFrameworks and I would be really curious what you think of it.

MoviePrint - Version 0.2.1
http://www.fakob.com/2013/movieprint-an-osx-tool/

It is an application which makes MoviePrints. You can drag in one or multiple videos, manipulate In and Outpoints or every single frame individually. Choose the raster of your print and finally create a PNG out of it.
Press the H key for Help

Two mentionable issues.
Scrolling only works with the scrollbar on the right.
Large prints may endup in a malloc error.

Enjoy
fakob