You really need to answer Ed’s questions. There’s no one size fits all answer.
Internet connection can range from dial up to fast cable modem (or faster).
Computers can range from “state of the art” to a 10 year old PC with Windows 98 and Windows Media Player 6.4
Viewers can range from those in a corporate officer in which IT refuses to allow users to install certain players to a kid with the latest version of Quicktime.
You have to decide WHO you want to view the video and what type of computer and internet connection you think the have.
It’s like asking about how to make dinner taste good. Does your audience eat at McBurgers or the Gourmet French restaurant?
Know your audience and we can tell you how to make the dinner test good to them.