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articles/ai-services/speech-service/batch-transcription-audio-data.md

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## Supported audio formats and codecs
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The batch transcription API supports many different formats and codecs, such as:
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The batch transcription API (and [fast transcription API](./fast-transcription-create.md)) supports many different formats and codecs, such as:
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- WAV
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- MP3

articles/ai-services/speech-service/fast-transcription-create.md

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- Video dubbing
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> [!NOTE]
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> Fast transcription API is only available via the speech to text REST API version 3.3.
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> Fast transcription API is only available via the speech to text REST API version 2024-05-15-preview.
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## Prerequisites
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- An Azure AI Speech resource in one of the regions where the fast transcription API is available. The supported regions are: Australia East, Brazil South, Central India, East US, East US 2, Japan East, North Central US, North Europe, South Central US, Southeast Asia, Sweden Central, West Europe, West US, and West US 2. For more information about regions supported for other Speech service features, see [Speech service regions](./regions.md).
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- An audio file (less than 2 hours long and less than 200 MB in size) in one of the supported formats and codecs: WAV, MP3, OPUS/OGG, FLAC, WMA, AAC, ALAW in WAV container, MULAW in WAV container, AMR, WebM, M4A, and SPEEX.
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- An Azure AI Speech resource in one of the regions where the fast transcription API is available. The supported regions are: Central India, East US, Southeast Asia, and West Europe. For more information about regions supported for other Speech service features, see [Speech service regions](./regions.md).
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- An audio file (less than 2 hours long and less than 200 MB in size) in one of the formats and codecs supported by the batch transcription API. For more information about supported audio formats, see [supported audio formats](./batch-transcription-audio-data.md#supported-audio-formats-and-codecs).
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## Use the fast transcription API
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## Related content
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- [Speech to text real-time API for short audio](./rest-speech-to-text-short.md)
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- [Speech to text quickstart](./get-started-speech-to-text.md)
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- [Batch transcription API](./batch-transcription.md)

articles/ai-services/speech-service/speech-services-quotas-and-limits.md

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| Quota | Free (F0) | Standard (S0) |
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|-----|-----|-----|
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| Max audio input file size | N/A | 200 MB |
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| Max audio length | N/A | 120 minutes per file |
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| Maximum audio input file size | N/A | 200 MB |
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| Maximum audio length | N/A | 120 minutes per file |
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| Maximum requests per minute | N/A | 300 |
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#### Batch transcription
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articles/ai-services/speech-service/speech-to-text.md

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# What is speech to text?
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In this overview, you learn about the benefits and capabilities of the speech to text feature of the Speech service, which is part of Azure AI services. Speech to text can be used for [real-time](#real-time-speech-to-text) or [batch transcription](#batch-transcription-api) of audio streams into text.
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In this overview, you learn about the benefits and capabilities of the speech to text feature of the Speech service, which is part of Azure AI services. Speech to text can be used for [real-time](#real-time-speech-to-text), [batch transcription](#batch-transcription-api), or [fast transcription](./fast-transcription-create.md) of audio streams into text.
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> [!NOTE]
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> To compare pricing of [real-time](#real-time-speech-to-text) to [batch transcription](#batch-transcription-api), see [Speech service pricing](https://azure.microsoft.com/pricing/details/cognitive-services/speech-services/).
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Real-time speech to text is available via the [Speech SDK](speech-sdk.md) and the [Speech CLI](spx-overview.md).
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## Fast transcription API (Preview)
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## Fast transcription (Preview)
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Fast transcription API is used to transcribe audio files with returning results synchronously and much faster than real-time audio. Use fast transcription in the scenarios that you need the transcript of an audio recording as quickly as possible with predictable latency, such as:
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