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

Requirements
You need this to get it done:

Video (Ad Server Hosted)
Maximum video length: 30 seconds (unskippable)
Minimum video resolution: 1280 x 720 (1920 x 1080 recommended)
Minimum bitrate: 2000Kbps
Peak audio: -9dB
File format: .mp4
Maximum file size: 240MB
Tracking
Supported 3rd Party Tracking Vendors:
DCM
Innovid
Sizmek
Flashtalking
Supported 3rd Party Tracking Events (1x1 Pixels):
Impressions
Clicks
Quartiles
Completes
Third-Party Served (VAST)
Video file requirements: (see previous video file specs)
Minimum required transcode ranges:
1920 x 1080 at 8000 Kbps
1280 x 720 at 5000 Kbps
Maximum FPS (frames per second): 30
VAST 3.0 only
Must NOT have geo, browser or any other targeting on the third party end.
Required alphanumeric "id" attribute populated on the <Creative> element in VAST XML
Requirements missing or found errors? Report

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

1
Twitch Advertising - SureStream
Twitch official help article listing all specs for SureStream.
Official
Link missing here or found errors? Improve How-Tos