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Table 1. Advanced Parameters





false (default), true

Specifies that the input file is encoded in base 64.


The value specified is the name or number of the billing account that a transcription request should be associated with.


false (default), true, language_model

The lid parameter enables you to use the ASR engine's Language Identification Module to identify the language spoken in the input audio. When lid identifies the language, the appropriate language model is selected based on the spoken language detected in the audio. For example, if Spanish is detected, then the resulting transcript will be in Spanish. Additionally, if you require an alternate model, specify it using lid=language_model.

  • lid=true - automatically selects the language identification model based on the LID and language models that are available.

  • lid=language_model - the alternate language model.

  • lid=language_model,language_model - for dual-channel audio, this specifies the alternate language models to use for channel 0 and channel 1 respectively.

  • lid=language_model:notext - use this to not decode when a language is detected, just that a language was detected. If this option is specified, the JSON will not contain a model metadata element in each utterance.

  • lid=false - lid is not used.

  • lidoffset=N - Delays the start of LID until specified (N) seconds into audio. If there is not enough audio left after offset, this will process preceding utterances in reverse. This option is only available in V‑Blaze 7.1+ and V‑Cloud 1.6+.


true (default), false, md5

Available with V‑Cloud 1.6+

The filemd5 parameter enables or disables MD5 verification of audio data.

  • filemd5=true - Default value of filemd5. Setting the value to true enables MD5 verification if possible.

  • filemd5=false - Setting the value to false disables MD5 verification. Disabling MD5 verification is useful for audio data that includes Content-MD5 or ETag headers that don't specify any MD5 for the audio data.

  • filemd5=user-specified-md5 - Enables MD5 verification by specifying a 32 hexadecimal digit value to use for verification.