This is a small JavaFX app that can record sped-up footage (timelapse) of the screen.
First, you specify how far apart frame captures will be.
Then, you choose the resulting file location. Lastly, when you think the recording is done, you press the "Stop and save" button to finish recording.
Timelapsee uses a combination of AWT robot to create screen captures and JCodec to stitch them together, although a different kind of recorder is easily implementable.