Figuring out how PowerPoint plays movies and sounds can be perplexing to say the least.
Andrew May has written two new MSDN articles on the subject:
article talks about how PowerPoint plays your multimedia
file. There are some nice flow charts that show the process PowerPoint
uses to decide which media player to use. Andrew also talks about how
PowerPoint picks a codec to play your multimedia.
second article for VBA programmers
has lots of code showing how
to insert a media file into a presentation, for instance.
For more of the basics on how to insert a media file, check out this
Sounds and Video tutorial.