Creative subtypes (audio and video) value 5 means VAST 2.0 Wrapper
VAST 2.0 Wrapper: a VAST 2.0 response that redirects to another VAST document.
When to send it
Send 5 when the player follows wrappers written in VAST 2.0. Each wrapper hop adds a network request, and many players cap the chain depth, but OpenRTB has no field for that limit; this value only says that wrappers of this version are accepted.
DSP ad servers commonly answer with a wrapper so they can count impressions and rotate creative, so on older web inventory 5 is one of the values buyers check most often. It is confused with 2, and with 6 when a buyer's wrapper declares one version but wraps a document of another.
Example
{
"imp": [
{
"audio": {
"protocols": [
5
]
}
}
]
}Fields that carry it
Other values in creative subtypes (audio and video)
| Value | Name |
|---|---|
1 | VAST 1.0 |
2 | VAST 2.0 |
3 | VAST 3.0 |
4 | VAST 1.0 Wrapper |
6 | VAST 3.0 Wrapper |
7 | VAST 4.0 |
8 | VAST 4.0 Wrapper |
9 | DAAST 1.0 |
10 | DAAST 1.0 Wrapper |
11 | VAST 4.1 |
12 | VAST 4.1 Wrapper |
13 | VAST 4.2 |
14 | VAST 4.2 Wrapper |
15 | VAST 4.3 |
16 | VAST 4.3 Wrapper |
The creative subtypes (audio and video) list page explains the whole list and its common mistakes.