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# AndThen Engine Configuration Parameters

An AndThen engine compares two tracks to identify events in the second track that occur within a specific time interval after (or at the same time as) events in the first track. The engine produces a track containing the identified record pairs. This section describes the parameters that you can set in the configuration section for an AndThen ESP task.

NOTE:

This engine is available only for processing video. It is not supported with images and documents.

Configuration Parameter | Description
--- | ---
Input0 | The first input track.
Input1 | The second input track.
LuaScript | A Lua script that defines conditions that a record pair must meet in order to be included in the output track.
MaxTimeInterval | The maximum interval from a record in the first track to a record in the second track, for the two records to be considered a pair.
MinTimeInterval | The minimum interval from a record in the first track to a record in the second track, for the two records to be considered a pair.
Type | The type of ESP engine to use. Set this parameter to `AndThen`.

## Output Tracks

This engine produces a single output track, named `TaskName.Output`.

Field name | Type | Description
--- | --- | ---
`record0` | Record | The record from the first input track (Input0)
`record1` | Record | The record from the second input track (Input1)

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