Action Details
Requirements and how-to articles for Twitch's action:

Broadcasting on Twitch.

You need this to get it done:

Encoding Profile: Main (preferred) or Baseline
Mode: Strict CBR
Keyframe Interval: 2 seconds
Frame rates: 25/30 or 50/60 frames per second
Recommended bitrate range: 3-6 megabits per second
Codec: h.264 (x264)
Codec: AAC-LC. Stereo or Mono
Recommended Bitrate (for maximum compatibility) 96kbps
Maximum audio bit rate: 160 kbps (AAC)
Sampling frequency: any (AAC)
Full HD High Framerate Video Specifications (Recommended)
Vertical Resolution: 1080
Bitrate: 4500 to 6000 kbps
Frame rate: 60 or 50 fps
Keyframe Interval: 2 seconds
AVC (h.264) Profile: Main/High
AVC (h.264) Level: 4.2
Max Broadcast Length
48 hours is the maximum length of time which one broadcast can continuously run for,
Requirements missing or found errors? Report

How-To Articles
A list of useful links for you:

Twitch Customer Support - Broadcast Requirements
This article explains the different requirements necessary for broadcasting on Twitch, as well as some common issues and resolutions. It also provides links to the most popular broadcasting software applications.
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