Trimming a video is really easy with PowerPoint.
- Start from inserting a video. Go to the ribbon and choose Insert tab.
- Click Video button and insert a video to your presentation.
- To trim a video go to the ribbon again to the Video Tools.
- Select Playback tab.
- Click Trim Video button.
- New dialog box appeared. Here you can set Start Time and End Time.
Now your video is trimmed.