You can control a movie on a slide by using the pointer to click controls that appear when you move the pointer over the movie on the slide; to do this the slideshow must be set up to show the pointer when a movie appears on a slide. The controls that do appear depend on the movie’s dimensions (its size on the slide); a smaller movie has fewer controls.
Another way to control movie playback during your presentation is to use the keyboard.
Choose Keynote > Preferences, and then click Slideshow.
Select the checkbox for “Show playback controls when pointer is over a movie.”
Press or hold the key that corresponds to the action you want:
When creating your slideshow, you can set the playback volume for movies and specify whether the movie begins playing as soon as the slide appears, or whether it begins after you click. You can also choose to have movies play once through or in a continuous loop, or to loop forward and backward. For instructions, see Setting Slideshow Playback Options.