Updated March 2010
For the latest release of VAST, please visit: VAST 4.0
PLEASE NOTE: An update was made to the 2.0 Schema because of a small typo found. Please use the schema labeled vast_2.0.1 as the official VAST 2.0 schema. This Video Ad Serving Template (“VAST”) includes a standard XML-based ad response for in-stream video as well as an XML Schema Definition (“XSD”) for developers. It is meant to accommodate the majority of current practices within the online digital video advertising business.
IAB members are encouraged to show their compliance with VAST through the IAB Compliance Seal Program.
VAST is designed for any on-demand video player where the ad response is parsed prior to play. For example, use of this standard would be appropriate within an Adobe Flash player if the ad response was requested and parsed in ActionScript but would not be appropriate if contained directly within a SMIL playlist directly sent to the player. It may be possible to use this XML format for applications other than on-demand viewing such as live video streaming, downloadable video players, set-top boxes, etc, but those applications are explicitly beyond the scope of the current effort.
The goal of this specification is to be compatible with any video player framework that has the ability to be scriptable. It will be up to each Secondary Ad Server to develop its own implementation of the standard and it will be up to each publisher or vendor to implement the standard in their Primary Ad Server and their Video Players.
It is assumed in this document that Video Players will align impression tracking with the IAB Digital Video Impression Guidelines.
This document is intended to support both Linear Video Ads (such as “pre-rolls”), Non-linear Video Ads (such as “overlays”) and Companion ads as defined in the IAB Digital Video Ad Format Guidelines. Many Non-linear ads include complex interaction with the underlying Video Player, and thus the VAST standard may not be entirely sufficient for implementing such ads across ad servers at this time. It is also important to note that VAST does not specify the positioning or timing of the ads within a video player; it is left to the video player itself to determine this since the player is the entity with the understanding of the context in which the ads will appear.