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# LuaScript

The path of a Lua script to run to determine whether a record or pair of records should be included in the output from the ESP task.

Specify an absolute path or a path relative to the directory specified by LuaDirectory.

The script must define a function with the name `pred`. The function must return either `true` or `false`.

The response to the result of the function depends on the type of ESP task.

ESP task | Result if the function returns true
--- | ---
And | The record pair is included in the engine output track.
AndAny | The record in the first track is included in the output. (Records from the second track are never included in the output).
AndNot | The record in the first track is discarded. (Records from the second track are never included in the output anyway.)
AndNotThen | The record in the first track is discarded. (Records from the second track are never included in the output anyway.)
AndThen | The record pair is included in the engine output track.
AndThenAny | The record in the first track is included in the output. (Records from the second track are never included in the output).
Combine | The record is combined with the record in the `Input0` input track and both are included in the output.
Deduplicate | The second record is discarded.
Filter | The record is included in the engine output track.

For more information about writing Lua scripts for ESP processing, refer to the Media Server Administration Guide.

Type: | String
Default: |
Required: | No
Configuration Section: | TaskName
Example: | `LuaScript=breakingnews.lua`
See Also: |

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