AWS SDK Version 3 for .NET
API Reference

AWS services or capabilities described in AWS Documentation may vary by region/location. Click Getting Started with Amazon AWS to see specific differences applicable to the China (Beijing) Region.

Starts asynchronous detection of labels in a stored video.

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, 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 and pass the job identifier (JobId) from the initial call to StartLabelDetection.


For .NET Core and PCL this operation is only available in asynchronous form. Please refer to StartLabelDetectionAsync.

Namespace: Amazon.Rekognition
Assembly: AWSSDK.Rekognition.dll
Version: 3.x.y.z


public abstract StartLabelDetectionResponse StartLabelDetection(
         StartLabelDetectionRequest request
Type: Amazon.Rekognition.Model.StartLabelDetectionRequest

Container for the necessary parameters to execute the StartLabelDetection service method.

Return Value
The response from the StartLabelDetection service method, as returned by Rekognition.


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.
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 8GB. The maximum duration is 2 hours.

Version Information

.NET Framework:
Supported in: 4.5, 4.0, 3.5

Portable Class Library:
Supported in: Windows Store Apps
Supported in: Windows Phone 8.1
Supported in: Xamarin Android
Supported in: Xamarin iOS (Unified)
Supported in: Xamarin.Forms

See Also