When you insert a movie, you're prompted to select a way to start it.
When you insert the movie, you're given the choice to start it either automatically or when you click with the mouse.
- Click Automatically if you want the movie to start by itself. If you have no other media effects on the slide, the movie plays as soon as the slide is displayed. If you already have another effect, such as an animation, on the slide, the movie plays after that effect.
A Pause effect also gets added automatically. When you click the movie in a slide show, the movie stops, and it resumes when you click again.
- Click When Clicked if you want the movie to play only when you click the movie frame on the slide. This setting is known as a trigger because you have to click something specific—the movie itself, as opposed to merely clicking the slide—to play the movie.
The same type of Pause effect is added with this setting: In a slide show, click the movie frame to pause it and again to resume it.
If you decide later that you want your start setting to be different, you can change it in the Custom Animation task pane—where a bunch of other options are available, too. You'll become more familiar with these options in the practice.