There are a number of ways to do this, which one you choose depends on your needs and of course on the browser that is being used to view your video, As you no doubt know, every browser, on every platform, windows, MAC, Linux, ect, ect, ect, can behave differently, this is one of the biggest stumbling blocks for the developer, what may work well on one platform may not work on another, what may work on one browser, may not work on another,

I have experienced this first hand when working with AJAX and JQuery, I designed a video popup box, this was years before the current ones you see now, and safari and firefox worked fine but not IE, then IE would work but not IE8, see how it can drive you insane in short order?

Here is what I decided to do, I moved it away from all the variables, and made it dependent on one thing, an Independent, private presentation, this way I could control what happens, and they were a captive audience, this is an option depending on what your goals are,

However, if you are not inclined to explore that avenue, you can try to script it, in one of two ways, using flash as the container, and use stop and go, scripting using AS3, play video until you reach frame number, 1234, then stop, and present next content then you can either script an auto start feature, or have the user click to start,

Or less appealing is to use a timer, again the undependable browser issues,

Yes, I would expect it would depend on how that app functions and how it is works, if the FB app will play an FLV or an SWF, then you can script it using Action Script,