MoviePrint - Betaversion - feel free to give feedback

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

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.