Showing a video or playing a piece of sound during your slide presentation is a great way to help get your message across.
Here is a tip for you add a video or a piece of sound.
On the left side of the screen, click the thumbnail of the slide that you want to add the video or sound to.
On the Insert menu, select Movie and Sound. The Select File window opens.P movie sound.jpg
Locate your video file or sound file in the window, select it and click Open
To reduce the image area but keep the aspect ratio, press and hold Shift while you drag a corner handle.
To re-center the image, right-click it and then click Alignment > Centered
To preview the video or sound, use the icons on the Media Playback toolbar that displayed when you added the video or sound.
This article helps.
https://wiki.openoffice.org/wiki/Add_Vi ... esentation