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# LangIdFeature

The `LangIdFeature` task converts an audio file containing a single language into a language identification feature (.lif) file. Language identification feature files are required for training language classifiers.

## Parameters

Parameter | Description | Required
--- | --- | ---
Type | The task type. Set to `LangIdFeature`. | Yes
AppDnnBase | The location of the `appResources` directory, which contains the DNN and `.ian` files to use. |
AppFrameDupl | The balance between performance and speed for audio preprocessing DNN classification. |
AudioUpsampling | Whether to allow audio upsampling if the input audio has a sample rate too low for the task. |
Beam | The beam width of the search process. |
DnnFile | The Deep Neural Network acoustic modeling file to use. |
EndTime | The end of an audio section to process. |
File | The audio file to process. | Yes, if InputType is `File`.
InputType | The type of audio to process (file, binary data, or stream). |
Lang | The name of the language pack to use. | Yes
Out | The language identification feature (.lif) file to create. | Yes
SilThresh | The threshold between what the task identifies as silence and non-silence. |
SpeechThresh | The threshold between speech and non-speech (music or noise). |
StartTime | The beginning of an audio section to process. |
SugdInputChannels | The channel layout of the input media file. This parameter does not apply when InputType is `Stream`. |
SugdInputFrequency | The sampling rate of the input media file. This parameter does not apply when InputType is `Stream`. |

## Example

    http://localhost:15000/action=AddTask&Type=LangIdFeature&File=C:\Data\FrenchSpeech.wav&Out=frenchSpeech.lif

This action creates the `frenchSpeech.lif` file from the `FrenchSpeech.wav` file.

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