Rendering is the process of exporting your project into a new, finalized media file. Rendering only creates a new “rendered” video file, and does not affect the project itself; you can still make edits to your project and render again as many times as needed.
From the Project menu, use Render.
Adjust the various encoding settings, if needed, to use settings different from the project settings.
Click the Render button.
If your computer is set to suspend or hibernate automatically, PiTiVi will automatically inhibit the power saving features during the render process (see bug bug #571885).