To speed up the selected video, choose Clip > Fast Forward, and then choose a multiple: 2x, 4x, 8x, or 20x. The Clip menu appears in a light gray bar across the top of your computer screen. To slow down the selected video, choose Clip > Slow Motion, and then choose a percentage to slow the clip: 50%, 25%, or 10%. In the Project browser, select one or more video clips or a frame range.

If you change your mind later and want to undo the changes you’ve made, you can always open the inspector again and reset the speed or direction of the clip. After the video is converted, you can drag the Speed slider or set the percentage of the clip’s normal speed as described above. Certain types of video-including video shot with the iPhone and H.264 video shot on the Flip camcorder-must be converted before making a speed change. If you see a Convert Entire Clip button instead of the Speed slider, click it. To set the percentage of the clip’s normal speed you want to apply, or to set the clip’s duration in seconds, type values in the fields to the right of the Speed slider. The farther you drag the slider, the more extreme the speed change. In the Clip inspector that opens, drag the Speed slider to the left to make the video play slower or to the right to make it play faster. In the Project browser, double-click a video clip, or select more than one video clip or a frame range and then double-click.

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