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Make a new movie recording: If you have a built-in iSight camera, or have an external video camera attached to your Mac, you can record a movie using QuickTime, then share it with others as explained in Tips 2 & 3.
1 Open QuickTime, then from the File menu, choose “New Movie Recording.”
2 Click the red Record button on the Controller bar of the video window (below). If you don’t see a Controller bar, hover your pointer over the movie window. The Controller bar disappears when you move your pointer away from the window.
Click the small, down-facing triangle on the right side of the controller bar to choose change some default options, such as "Camera" (if you have more than one available), "Microphone," Quality" (Medium, High, or Maximum), and "Save to" (you can change the location from the default "Movies" folder located in your Home folder to any location you prefer).
3 Click the red Record button again to stop recording. The Controller bar changes to a playback control, so you can play the new movie.
4 To save the movie, go to the File menu, then choose “Save As….” If you close the movie window (click the red button in the top-left corner) without saving, the movie is automatically saved in the Movies folder in your Home folder.
Make a new audio recording: If you have a built-in microphone, or have an external mic connected to your Mac, you can make audio recordings with QuickTime.
1 Open QuickTime Player, then from the File menu, choose “New Audio Recording.”
2 Click the red Record button in the “Audio Recording” window.
3 To stop recording, click the Record button again.
Make a new screen recording: If you want to record the activity on your screen—for instructional purposes, or perhaps to record a streaming event on the Internet, or for any other reason—use QuickTime to make a screen recording.
1 Open QuickTime, then from the File menu, choose “New Screen Recording.”
2 In the “Screen Recording” window that opens (below), click the red Record button.
3 A dialog sheet drops down to confirm your request (below). Click “Start Recording.” To stop recording, click the “Stop Recording” button that appears in the menu bar at the top of your screen (you can click the white “Show Me” button, shown below, to highlight the "Stop Recording" button in the menu bar). Or, press the Command Control Escape keys to stop recording.
If you don’t manually choose a Save option from the File menu, or a Share option from the Share menu, your movie is automatically saved as “Screen Recording” in the Movies folder of your Home folder.