Guidelines and Quotas - Amazon Transcribe

Guidelines and Quotas

Supported Regions

For a list of AWS Regions where Amazon Transcribe is available, see Amazon Transcribe Endpoints and Quotas in the Amazon Web Services General Reference.

Throttling

You can request a quota increase for the following resources:

Resource Default
Number of concurrent batch transcription jobs 100
Job queue bandwidth ratio 0.9
Transactions per second, StartTranscriptionJob operation 10
Number of concurrent HTTP/2 streams for streaming transcription 5
Number of StartStreamTranscription Websocket requests 5
Transactions per second, StartStreamTranscription operation 5
Total number of vocabularies per account 100
Number of pending vocabularies 10
Number of concurrently training custom language models 3
Total number of custom language models per account 10
Number of channels for channel identification 2
Transactions per second, GetTranscriptionJob operation 20
Transactions per second, DeleteTranscriptionJob operation 5
Transactions per second, ListTranscriptionJobs operation 5
Transactions per second, CreateVocabulary and UpdateVocabulary operations 10
Transactions per second, DeleteVocabulary operation 5
Transactions per second, GetVocabulary operation 20
Transactions per second, ListVocabularies operation 5

For information about requesting a quota increase, see AWS Service Quotas in the Amazon Web Services General Reference.

If you don't need to process all of your transcription jobs concurrently, use Job Queuing. This enables Amazon Transcribe to keep track of your transcription jobs and process them when slots are available. You can request an increase to the job queue bandwidth ratio to run more transcription jobs. The quota for the transcription jobs in your job queue is the product of the number of transcription jobs you can run concurrently and the bandwidth ratio. For example, if you have a bandwidth ratio of 5 and a quota of 100 for the number of transcription jobs you can run concurrently then you can have 500 transcription jobs in your job queue.

Guidelines

For best results:

  • Use a lossless format, such as FLAC or WAV, with PCM 16-bit encoding.

  • Use a sample rate of 8000 Hz for low-fidelity audio and 16000 Hz for high-fidelity audio.

Amazon Transcribe may store your content to continuously improve the quality of its analysis models. See the Amazon Transcribe FAQ to learn more. To request that we delete content that may have been stored by Amazon Transcribe, open a case with AWS Support.

Quotas

Amazon Transcribe has the following quotas that are not alterable:

Description Quotas
Maximum audio file length 14,400 seconds
Maximum audio file size 2 GB
Maximum size of a custom vocabulary 50 KB
Maximum length of a custom vocabulary phrase 256 characters
Maximum size of a vocabulary filter 50 KB
Maximum number of vocabulary filters 100
Number of days that job records are retained 90
Minimum audio file duration, in milliseconds (ms) 500