To record a movie with Marble, use this function for recording.
Begin recording from the Record Movie dialog in the Edit menu. Or you can start it by pressing Ctrl+Shift+R. You will see a dialog like this:
Press the Open button to choose the name and destination directory of the movie. Also you can change the frames per second (FPS) of the movie between 1 and 60.
When all is set, you can start recording. To start, click the Start button. Once this is done you can zoom and pan around and Marble will capture a video of your journey across the globe.
To stop recording of the movie and save it, click Stop Recording in the Edit menu or press Ctrl+Shift+S.