Accurately identify who spoke when in any audio using our Speaker Diarization. This scalable, language-agnostic service segments multi-speaker audio into speaker-labeled time intervals, supporting formats like WAV, MP3, and FLAC. Ideal for transcription, call analytics, media processing, and compliance workflows.
The Speaker Diarization API enables accurate segmentation of audio recordings by detecting and labeling individual speakers across time. Designed for seamless integration into transcription pipelines, media workflows, and audio analytics systems, it supports a wide range of formats including WAV, MP3, FLAC, and OGG. The service is language-agnostic and works across diverse audio sourcecalls, meetings, interviews, podcasts, and more. With built-in support for mono and stereo channels, varying sample rates, and flexible input options it can be deployed in batch or near-real-time use cases. Key features include automatic speaker count estimation, precise time-stamped speaker labeling, and detection of overlapping speech. Outputs are returned in structured JSON for easy integration with transcription engines, search indexes, or business intelligence tools. Whether you are enriching speech-to-text transcripts, analyzing call center performance, or processing long-form media, this API improves clarity, organization, and data usability.
Highlights
Accurate speaker diarization for multi-speaker audio, with support for automatic speaker count estimation and overlapping speech detection.
Language-agnostic and format-flexible: Works with WAV, MP3, FLAC, and more; supports mono and stereo channels for diverse use cases like transcription and media analysis.
AWS Marketplace now accepts line of credit payments through the PNC Vendor Finance program. This program is available to select AWS customers in the US, excluding NV, NC, ND, TN, & VT.
You pay by the hour for model inference running on a single instance type, the ml.g4dn.xlarge. The two dimensions split by processing mode. Batch mode handles pre-recorded audio files submitted for diarization, identifying who spoke when. Real-time mode processes streaming audio as a conversation unfolds, delivering speaker labels with low latency. Both bill per host hour, so your cost scales with how long each instance runs. Choose the mode that matches your workload: batch for recorded files, real-time for live streaming pipelines.
Top-of-mind questions for buyers
What does one host hour cover on the ml.g4dn.xlarge instance?
One host hour is one hour that a single ml.g4dn.xlarge instance runs the diarization model. Billing counts wall-clock running time per instance, not the length of audio processed. If you run multiple instances at once, each accrues its own host hours in parallel.
How do the batch and real-time modes differ mechanically for billing?
Both modes bill per host hour on the same instance type. Batch mode processes pre-recorded audio files submitted as jobs. Real-time mode processes streaming audio live over a connection, returning speaker labels with low latency. Your cost tracks how long the instance runs, whichever mode you choose.
Am I charged when the instance sits idle between diarization jobs?
Charges accrue per host hour while the instance runs, whether or not it is actively processing audio. Idle time on a running instance still meters host hours. To stop software charges, stop the instance. Underlying AWS infrastructure fees may still apply for stored resources.
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Version release notes
Precision-2 model with improved diarization capabilities (37% accuracy improvement). New optional min_speakers and max_speakers input arguments.
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