After inserting a video within your presentation, you may see a blank / black rectangle on the slide as placed video clip. The appearance of the blank / black rectangle is caused by the file format of the video clip inserted on the slide — not all the formats show these blank / black rectangles. In fact, you may also see the first frame of the video clip in some cases. With PowerPoint 2013’s Poster Frame option, you can easily overcome this limitation, and change the black rectangle to a picture of your choice by selecting a frame from the video itself, or even a picture from a different source.
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