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
Quotas
Amazon Transcribe has the following quotas that are not alterable:
| Description | Quotas |
|---|---|
| Maximum audio file length | 4:00:00 (four) hours, 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 |
