# Alert - Stationary

Generates an alert when an object is stationary for a specified amount of time. By default the engine analyzes the entire scene but you can also restrict analysis to a region. Before using this analysis engine, configure a task such as Object Class Recognition to track objects.

Configuration Parameter | Description
--- | ---
FreeformRegion | The region of the scene that you want to monitor.
Input | The name of the image track to analyze.
MinimumTime | The amount of time that an object must remain stationary.
Region | The region of the scene that you want to monitor.
RegionUnit | The units to use to specify the position and size of the region.
Type | The analysis engine to use. Set this parameter to `AlertStationary`.

## Output Tracks

Output track | Description
--- | ---
`Data` | Contains one record for each object that is stationary for longer than MinimumTime, for each video frame.
`Result` | Contains one record for each object that is stationary for longer than MinimumTime. If a stationary object moves and then becomes stationary again, Media Server can produce multiple results with the same ID. Media Server increments the value of the `alertIndex` field each time the object moves and becomes stationary again.
`ResultWithSource` | The same as the `Result` track, but each record also includes the best source frame.
`Start` | The same as the `Data` track, except it contains only the first record of each event.
`End` | The same as the `Data` track, except it contains only the last record of each event.
`Alert` | Contains one record for each object that is stationary for longer than MinimumTime. If a stationary object moves and then becomes stationary again, Media Server can produce multiple alerts with the same ID. Media Server increments the value of the `alertIndex` field each time the object moves and becomes stationary again. This track differs from the `Result` track because records are created as soon as the object meets the minimum time requirement, rather than when the object starts moving again.
`AlertWithSource` | The same as the `Alert` track, but each record also includes the source frame.

To see an example record, use the action GetExampleRecord.

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