An in-stream video refers to video ads. DCM is able to serve video ads to video players on a publisher's website.
DCM In-Stream ads are VAST compliant. VAST stands for "Video Ad Serving Template". It is a set of standards set by the IAB that allows for widespread compatibility across the web for video ad serving.
VAST is the IAB-established 3PAS standard for In-Stream Video. Traditionally, each website has its own video player with its own look and functionality. VAST standardizes an XML file that acts like a digital filing cabinet, providing links to video files, companion banners, non-linear banners, and tracking pixels that live on DoubleClick’s server. This allows publishers to keep using their own video player, while pulling in the assets they need from DoubleClick's servers.
What is VPAID?
VPAID stands for “Video Player-Ad Interface Definition” and is an IAB-published industry standard for interactive in-stream video ads.
There are two types of VPAID creatives: VPAID linear and VPAID non-linear.
VPAID linear: This type of creative appears by itself, not alongside publisher content. It can appear before, between, or after the publisher's video.
For example, a VPAID linear creative might interrupt a publisher's cartoon to display a video commercial with interactive graphics overlaying the advertiser's video content. LIVE EXAMPLE
VPAID non-linear: This type of creative only overlays content over a publisher's video, and will not interrupt the publisher's content. However, interacting with the overlayed creative (with a click) can interrupt the publisher's video and render the advertiser's content instead.
For example, a VPAID non-linear creative might show a small image across the bottom of a publisher's cartoon. Clicking the image might interrupt the publisher's cartoon and load a video that takes up the whole video player.
Difference:
VAST :In-stream video redirect creatives allow DCM to track other in-stream video creatives, including those that are running on a non-DoubleClick ad server. The in-stream video redirect creative has no assets and redirects to a VAST URL you specify. You’ll add the VAST URL in your creative and can specify the same settings as a video creative, including companions.
VPAID:VPAID creatives are rich media creatives that render in a publisher's in-stream video player. They typically use a Flash asset and involve video content and rich media. One important ability of VPAID creatives is that they can pause or mute the publisher's video player and bring up their own content, including interactive options.