Apple TV/FM Radio System - Manual (Page 108)

4 Click the video camera icon.
The capture controls appear.
5 Wait until the sequence that you want to capture begins.
The Controls window can remain open without affecting
what happens in the video window.
6 Click Record.
Recording begins and the Record button changes to a
Stop button.
7 Click Stop when you’ve recorded as much as you want.
Important If you don’t click the Stop button, recording
continues until the hard disk is full.
A dialog box appears, in which you can specify a name and
location for your movie.
You can also preview the QuickTime movie before you
save it.
101 Capturing TV and Video Images