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When you see the two-headed arrow, drag it to a new ending position for the video. To trim the end of the clip, click the end point (shown in the image below as a red marker, on the right). When you see the two-headed arrow, drag it to a new starting position for the video. To trim the beginning of the clip, click the start point (shown in the image below as a green marker, on the left). In the Trim Video dialog box, do one or more of the following: You can use the Next Frame and Previous Frame buttons to fine-tune the location for a marker. When you reach the point where you want to make the cut, press the Pause button.
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To determine where you want to trim your video footage, in the Trim Video dialog box, press the Play button.
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On the ribbon, under Video Tools, on the Playback tab, click Trim Video. Once the video is selected, a Video Tools section appears on the toolbar ribbon, and it has two tabs: Format and Playback: In Normal view, select the video border on the slide.
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