Why some movies play automatically and some don't in Powerpoint?

[Luis]

While the presentation is running...some movies will play automatically, buto
some won't. They are all in the same format. It seems that PP has a memory
limit.

 

[Lucy Thomson]

Hi

Check the settings for the movies in the custom animation taskpane - they
may be set to play with previous (automatically), to play on click (anywhere
on slide) or to play when triggered (by clicking the movie itself). If you
need any help, be sure to mention your version.

Lucy