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Copy file name to clipboardExpand all lines: articles/ai-services/speech-service/batch-transcription-audio-data.md
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@@ -7,7 +7,7 @@ author: eric-urban
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ms.author: eur
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ms.service: azure-ai-speech
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ms.topic: how-to
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ms.date: 3/10/2025
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ms.date: 5/25/2025
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ms.devlang: csharp
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ms.custom: devx-track-csharp, devx-track-azurecli
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# Customer intent: As a user who implements audio transcription, I want to learn how to locate audio files for batch transcription.
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## Supported audio formats and codecs
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The batch transcription API (and [fast transcription API](./fast-transcription-create.md)) supports multiple formats and codecs, such as:
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The [batch transcription API](./batch-transcription.md)and [fast transcription API](./fast-transcription-create.md) support multiple formats and codecs, such as:
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- WAV
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- MP3
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- WebM
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- SPEEX
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> [!NOTE]
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> Batch transcription service integrates [GStreamer](./how-to-use-codec-compressed-audio-input-streams.md) and might accept more formats and codecs without returning errors. We suggest to use lossless formats such as WAV (PCM encoding) and FLAC to ensure best transcription quality.
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> Batch transcription service integrates [GStreamer](./how-to-use-codec-compressed-audio-input-streams.md) and might accept more formats and codecs without returning errors. We suggest using lossless formats such as WAV (PCM encoding) and FLAC to ensure best transcription quality.
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## Azure Blob Storage upload
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## Upload to Azure Blob Storage
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When audio files are located in an [Azure Blob Storage](/azure/storage/blobs/storage-blobs-overview) account, you can request transcription of individual audio files or an entire Azure Blob Storage container. You can also [write transcription results](batch-transcription-create.md#specify-a-destination-container-url) to a Blob container.
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```
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> [!TIP]
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> When you are finished with batch transcriptions and want to delete your storage account, use the [`az storage delete create`](/cli/azure/storage/account#az-storage-account-delete) command.
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> When you're finished with batch transcriptions and want to delete your storage account, use the [`az storage delete create`](/cli/azure/storage/account#az-storage-account-delete) command.
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1. Get your new storage account keys with the [`az storage account keys list`](/cli/azure/storage/account#az-storage-account-keys-list) command.
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This section explains how to set up and limit access to your batch transcription source audio files in an Azure Storage account using the [trusted Azure services security mechanism](/azure/storage/common/storage-network-security#trusted-access-based-on-a-managed-identity).
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> [!NOTE]
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> With the trusted Azure services security mechanism, you need to use [Azure Blob storage](/azure/storage/blobs/storage-blobs-overview) to store audio files. Usage of [Azure Files](/azure/storage/files/storage-files-introduction) is not supported.
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> With the trusted Azure services security mechanism, you need to use [Azure Blob storage](/azure/storage/blobs/storage-blobs-overview) to store audio files. Usage of [Azure Files](/azure/storage/files/storage-files-introduction) isn't supported.
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If you perform all actions in this section, your Storage account is configured as follows:
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- Access to all external network traffic is prohibited.
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Follow these steps to generate a SAS URL that you can use for batch transcriptions.
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1. Complete the steps in [Azure Blob Storage upload](#azure-blob-storage-upload) to create a Storage account and upload audio files to a new container.
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1. Complete the steps in [Azure Blob Storage upload](#upload-to-azure-blob-storage) to create a Storage account and upload audio files to a new container.
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1. Select the new container.
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1. In the **Settings** group in the left pane, select **Shared access tokens**.
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1. Select **+ Container**.
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Follow these steps to generate a SAS URL that you can use for batch transcriptions.
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1. Complete the steps in [Azure Blob Storage upload](#azure-blob-storage-upload) to create a Storage account and upload audio files to a new container.
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1. Complete the steps in [Azure Blob Storage upload](#upload-to-azure-blob-storage) to create a Storage account and upload audio files to a new container.
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1. Generate a SAS URL with read (r) and list (l) permissions for the container with the [`az storage container generate-sas`](/cli/azure/storage/container#az-storage-container-generate-sas) command. Choose a new expiry date and replace `<mycontainer>` with the name of your container.
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```azurecli-interactive
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