**EDIT: This originally described a program called LiveStreamer, Streamlink is a fork of that project as the original hasn't been updated in two years. Thank you to GreenDragonIris for pointing this out to me!
https://streamlink.github.io/index.html
What is Streamlink?
The main purpose of Streamlink is to allow the user to avoid buggy and CPU heavy flash plugins but still be able to enjoy various streamed content.
Ever want to take part in an SCG stream but find you're having difficulties? Check out the Streamlink tool!
https://streamlink.github.io/install.html
You're most likely looking for the windows version, so you can download a pre-compiled version here : https://streamlink.github.io/install.html#windows-binaries
https://www.videolan.org/vlc/index.html
You need a video player in order to run Streamlink, VLC is the recommended option!
Start->Run->Cmd
Windows Key + R -> cmd.exe
streamlink http://www.ustream.tv/channel/xcC5XSDuurq
Ex. The SCG Stream link
You can read up more on what you can do with Streamlink with the following link : https://streamlink.github.io/cli.html