# Scene Analysis

Scene Analysis detects objects or events in a scene that are deemed important to the user. These events might be a vehicle breaching a red light, the presence of an abandoned bag, or traffic congestion.

Configuration Parameter | Description
--- | ---
BackgroundUpdateOnAlarm | Specifies whether to update the background in areas that are generating alarms.
Input | The image track to analyze.
MaskOverlay | Specifies whether to attempt to mask areas of the view that remain static.
MaxInputQueueLength | Can be used to place a limit on latency.
NumParallel | The maximum number of CPU threads to use for scene analysis.
SampleInterval | The interval at which frames are selected to be analyzed.
Type | The analysis engine to use. Set this parameter to `SceneAnalysis`.
TimeBetweenAlarms | The minimum interval between alarms.
TrainingCfg | The path to the training configuration file to use to identify suspicious events.
TrainingCfgName | The name of the training configuration file to use to identify suspicious events.

## Output Tracks

Output track | Type | Description | Output1This column indicates whether the information contained in the track is included by default in the output created by an output task (when you don't set the Input parameter for the output task).
--- | --- | --- | ---
`Data` | SceneAnalysisResult | Contains one record, describing the analysis results, for each alarm object in each video frame. If an object causes an alarm in more than one category there are separate records for each category. | No
`DataWithSource` | SceneAnalysisResultAndImage | The same as the `Data` track, but each record also includes the source frame. | No
`Result` | SceneAnalysisResult | Contains a record for each detected alarm object. If an object causes an alarm in more than one category there are separate records for each category. | Yes
`ResultWithSource` | SceneAnalysisResultAndImage | The same as the `Result` track, but each record also includes the best source frame. | No
`Start` | SceneAnalysisResult | The same as the `Data` track, except it contains only the first record of each event. | No
`End` | SceneAnalysisResult | The same as the `Data` track, except it contains only the last record of each event. | No
`TrafficLight` |  | Media Server outputs a record when the traffic lights change. | No
`PTZChange` |  | Media Server writes a record to this track when a PTZ camera is moved away from, or back to, the configured scene. The field "connected" contains the value `false` when the camera is moved away from the scene and Media Server stops generating alarms, and `true` when the camera is moved back to the scene and Media Server resumes generating alarms. | No

SceneAnalysisResult

Field name | Type | Description
--- | --- | ---
id | UUIDData | A universally unique identifier to identify the object
object | SceneAnalysis_Object | Information about the alarm object. This includes information such as: The size of the alarm object. The bounding box that contains the alarm object. The position of the center of the alarm object. The velocity of the alarm object. The amount of time that the object has been within the region of interest.

SceneAnalysisResultAndImage

The same as `SceneAnalysisResult` records, with the following additional fields.

Field name | Type | Description
--- | --- | ---
image | ImageData | The source frame

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