Adding a Movie to a Slide - movie don't play in any browser

Hello, everyone!

Please, I need help to solve or try to understand why a problem occurs.

I am adding a Flash video (flv) in PowerPoint slide using Articulate Presenter'09. The big problem is that videos do not work in all browsers, only in Google Chrome. But videos with smaller sizes (250x200 for example) work in any browser.

I'm referring to the visual size of the videos, and I'm not talking about duration, because I know that Articulate Presenter'09 does not support videos longer than 8 minutes.

I am providing the Scorm package within Moodle.

Questions:

• Am I doing something wrong?
• So what's the size of the flash video that's accepted by the articulate presenter'09 inside the slide to run smoothly in any web browser?
• Is there a standard size to add a video to slide?

I already saw these tutorials by Jeanette Brooks, but does not mention anything about it:

http://community.articulate.com/tutorials/products/adding-a-movie-to-a-slide.aspx

http://community.articulate.com/tutorials/products/adding-a-movie-to-the-presenter-panel-in-your-sidebar.aspx

http://community.articulate.com/tutorials/products/adding-a-movie-that-launches-in-a-separate-window.aspx

(P.S.: English is not my native language, so sorry for possible mistakes).