You can control the video in/out/duration times in the timeline. Often you will want to use a very short segment of your video to fit in with the timing of the rest of your slide show.
To change the timing of your video
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Select your video item in the timeline.
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Enter the desired in, out, and duration times in the
section of the inspector.

The maximum duration of the video is also provided for information. You can reset the timing of the video by setting the in time to zero and the duration to the maximum duration.