Sometimes a movie has sound, but you don’t want it. There are lots of reasons; video of a surgery and you don’t want the audience to hear ‘Uh-oh’ in the background, a screen capture video and the application sound FX are distracting, or any number of other reasons.

From within PPT you can set a movie to play muted.

PPT 2003:
1. Select movie

2. Right-click and choose EDIT MOVIE OBJECT

3. Click speaker icon and click MUTE

PPT 2007:
1. Select movie

2. Go to OPTIONS tab and click the speaker icon

3. Select MUTE

PPT 2010:
1. Select movie

2. Go to PLAYBACK tab, click the speaker icon, select MUTE

– Troy @ TLC