flite

Synthesize a voice utterance using the libflite library.

To enable compilation of this filter you need to configure FFmpeg with --enable-libflite.

Note that versions of the flite library prior to 2.0 are not thread-safe.

The filter accepts the following options:

'list_voices'

If set to 1, list the names of the available voices and exit immediately. Default value is 0.

'nb_samples, n'

Set the maximum number of samples per frame. Default value is 512.

'textfile'

Set the filename containing the text to speak.

'text'

Set the text to speak.

'voice, v'

Set the voice to use for the speech synthesis. Default value is kal. See also the list_voices option.

Command line examples

• Read from file 'speech.txt', and synthesize the text using the standard flite voice:

  flite=textfile=speech.txt
  

• Read the specified text selecting the slt voice:

  flite=text='So fare thee well, poor devil of a Sub-Sub, whose commentator I am':voice=slt
  

• Input text to ffmpeg:

  ffmpeg -f lavfi -i flite=text='So fare thee well, poor devil of a Sub-Sub, whose commentator I am':voice=slt
  

• Make 'ffplay' speak the specified text, using flite and the lavfi device:

  ffplay -f lavfi flite=text='No more be grieved for which that thou hast done.'
  

For more information about libflite, check: http://www.festvox.org/flite/