按着个步骤就可以：
01. Launch QuickTime
02. Select "Edit", "Preferences", "QuickTime Preferences"
03. Click the "Advanced" Tab.
04. At the bottom of the window, click the "Media Keys" button.
05. Click the "Add" button.
06. Enter the following data, then click "OK"
Category: Sorenson Media
Key: NI2005
07. Click the "Add" button.
08. Enter the following data, then click "OK"
Category: Sorenson Media
Key: CAPACITY
09. Click "OK" again.
10. Click the "Apply" button.
11. Click the "OK" button.
12. Close QuickTime.