How to decrease mb size of a video wmv file and in which software? I am using windows media player to create it. Besides I am creating an online presentation to be uploaded on a website as a tutorial. So what should be an ideal kb or mb size for this presentation so that it can work on even dialup connections without any problem. And in this ideal size how many minutes can be achieved for the total presentation? please give me the best possible "Size ~ minutes ~ quality" for the video.