ModSe7en

Legendary Skial King
Contributor
http://livestreamer.readthedocs.org/en/latest/
Livestreamer is a command line utility that automagically feeds a livestream to the media player of your choice (VLC if you're lazy). It completely bypasses Twitch's website, which means no shitty flash player or obnoxious chat. You can also log into your account with it and get drops from Katowice, which is streaming right now.
Scroll to the bottom of the Installing section and use the Github link.

Once it's installed, open cmd.exe and type in:
livestreamer [twitch url] [quality]
Quality can be best, worst, or any of the qualities twitch gives (source, 720p, etc.)
For example: livestreamer twitch.tv/esltv_cs best would open this.
 

ModSe7en

Legendary Skial King
Contributor
Bumping because TI4 looks glorious in fullscreen.
Code:
livestreamer twitch.tv/dota2ti best