The use is straightforward. You need at least a Get Specified Finder Items, select the movies you like to flatten. Plug the Flatten Movie action after it, choose the destination. Click Play. There is really no need for supplementary application on Mac to accomplish trivial tasks.
This is a clean up of my first release, as such the action should work in a more predictable way.
Fixed a bad design decision that wouldn't allow to save the destination folder.
Better handling of Quicktime in a threaded environment this version should be more responsive.