The project's goal is to create an app saving observed slides into a document. Take more attention on listening lectures, not on taking notes.
Let's show it on the example:
I opened an app and run it. 'document_dir' I wrote is a working directory with slides and a name of the output document.
I clicked 'start'. Then, I opened my presentation on full-screen mode. Each slide was opened for several or dozen seconds. When the presentation had finished I clicked 'end'.
How the result looks like?