Delivery methods value 1 means Streaming
The ad's media is delivered by a streaming protocol rather than as a single file.
When to send it
Send 1 when the player can play ad media delivered through a streaming protocol, typically adaptive formats such as HLS or DASH, where the player fetches segments as it plays. In VAST such a media file carries the streaming delivery attribute.
Buyers with adaptive renditions can return them for better quality on variable networks, and CTV and server-side insertion often work with streaming formats. It is confused with 2 (Progressive), which also plays while downloading but from a single file over plain HTTP; the test is whether the media is a segmented stream or one file.
Example
{
"imp": [
{
"audio": {
"delivery": [
1
]
}
}
]
}Fields that carry it
Other values in delivery methods
The delivery methods list page explains the whole list and its common mistakes.