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Compress the media files in your presentation - PowerPoint - Office.com
PowerPoint - improve playback performance and save disk space by compressing the audio and video files in your presentation.
Play a video automatically in a slide show - PowerPoint - Office.com
Play a video when you are in Slide Show view
Play music in the background of your slide show - PowerPoint - Office.com
Play audio for the duration of your slide show.
Set the 'Playback' options for a video in your presentation - PowerPoint - Office.com
Play a PowerPoint 2013 video automatically or when clicked, play a video full screen, prreview a video, set the volume of a video, hide a video when it is not playing, loop a video, rewind a video aft...
Embed or link to a video that is stored on my PC - PowerPoint - Office.com
You can embed a video in a slide or you can add a hyperlink that linkds to a video on a web site.