If you read the extended tutorial which is linked at the bottom, it tells you alot of extras on how to add border, text, change color size, manage custon actions and sutff. I dont think you saw it cuz your asking that question thats explained in the extended version
but anyways yea I dropped some colors and that made it smaller, adding a border also makes the file size smaller
and concerning virtualdub. use WinRar or Winzip or something to decompress it. Its not very big so I dont think it even has a installation file. The version I got, when I decompressed it, it was the actual files. Also becuse it doesnt necessarily put any system files, it doesnt need an installation. But get those programs that can handle .zips and you should be able to get it going.