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Starts asynchronous detection of labels in a stored video.
Amazon Rekognition Video can detect labels in a video. Labels are instances of real-world entities. This includes objects like flower, tree, and table; events like wedding, graduation, and birthday party; concepts like landscape, evening, and nature; and activities like a person getting out of a car or a person skiing.
The video must be stored in an Amazon S3 bucket. Use Video to specify the bucket
name and the filename of the video. StartLabelDetection returns a job identifier
(JobId) which you use to get the results of the operation. When label detection
is finished, Amazon Rekognition Video publishes a completion status to the Amazon
Simple Notification Service topic that you specify in NotificationChannel.
To get the results of the label detection operation, first check that the status value
published to the Amazon SNS topic is SUCCEEDED. If so, call GetLabelDetection
and pass the job identifier (JobId) from the initial call to StartLabelDetection.
Optional Parameters
StartLabelDetection has the GENERAL_LABELS Feature applied by default.
This feature allows you to provide filtering criteria to the Settings parameter.
You can filter with sets of individual labels or with label categories. You can specify
inclusive filters, exclusive filters, or a combination of inclusive and exclusive
filters. For more information on filtering, see Detecting
labels in a video.
You can specify MinConfidence to control the confidence threshold for the labels
returned. The default is 50.
This is an asynchronous operation using the standard naming convention for .NET 4.5 or higher. For .NET 3.5 the operation is implemented as a pair of methods using the standard naming convention of BeginStartLabelDetection and EndStartLabelDetection.
Namespace: Amazon.Rekognition
Assembly: AWSSDK.Rekognition.dll
Version: 3.x.y.z
public abstract Task<StartLabelDetectionResponse> StartLabelDetectionAsync( StartLabelDetectionRequest request, CancellationToken cancellationToken )
Container for the necessary parameters to execute the StartLabelDetection service method.
A cancellation token that can be used by other objects or threads to receive notice of cancellation.
| Exception | Condition |
|---|---|
| AccessDeniedException | You are not authorized to perform the action. |
| IdempotentParameterMismatchException | A ClientRequestToken input parameter was reused with an operation, but at least one of the other input parameters is different from the previous call to the operation. |
| InternalServerErrorException | Amazon Rekognition experienced a service issue. Try your call again. |
| InvalidParameterException | Input parameter violated a constraint. Validate your parameter before calling the API operation again. |
| InvalidS3ObjectException | Amazon Rekognition is unable to access the S3 object specified in the request. |
| LimitExceededException | An Amazon Rekognition service limit was exceeded. For example, if you start too many jobs concurrently, subsequent calls to start operations (ex: StartLabelDetection) will raise a LimitExceededException exception (HTTP status code: 400) until the number of concurrently running jobs is below the Amazon Rekognition service limit. |
| ProvisionedThroughputExceededException | The number of requests exceeded your throughput limit. If you want to increase this limit, contact Amazon Rekognition. |
| ThrottlingException | Amazon Rekognition is temporarily unable to process the request. Try your call again. |
| VideoTooLargeException | The file size or duration of the supplied media is too large. The maximum file size is 10GB. The maximum duration is 6 hours. |
.NET Core App:
Supported in: 3.1
.NET Standard:
Supported in: 2.0
.NET Framework:
Supported in: 4.5