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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 |
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 |
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.
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
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 |
| Number of channels for channel identification | 2 |
