asr

Automatic Speech Recognition

This filter uses PocketSphinx for speech recognition. To enable compilation of this filter, you need to configure FFmpeg with --enable-pocketsphinx.

It accepts the following options:

'rate'

Set sampling rate of input audio. Defaults is 16000. This need to match speech models, otherwise one will get poor results.

'hmm'

Set dictionary containing acoustic model files.

'dict'

Set pronunciation dictionary.

'lm'

Set language model file.

'lmctl'

Set language model set.

'lmname'

Set which language model to use.

'logfn'

Set output for log messages.

The filter exports recognized speech as the frame metadata lavfi.asr.text.