This Screenshot comes from a linux streaming session.
Since my friend asked me to help him to stream on twitch.tv from linux, i've decided to write something really user-friendly that can be used by everyone. so here it is: Twitch-Streamer-Linux (github)
This little script allows you to stream on Twitch like the non-free apps on windows. You can choose the quality and if stream with the webcam or not.
There is an HOW-TO on the Readme (LINK). if you have any question, just write here or on github.
i have added also some flags to get "Excellent" as quality on Twitch. now works as good as non-free programs :D