Apply time-stretching and pitch-shifting with librubberband.

The filter accepts the following options:

tempo

Set tempo scale factor.

pitch

Set pitch scale factor.

transients

Set transients detector. Possible values are:

• crisp
• mixed
• smooth

detector

Set detector. Possible values are:

• compound
• percussive
• soft

phase

Set phase. Possible values are:

• laminar
• independent

window

Set processing window size. Possible values are:

• standard
• short
• long

smoothing

Set smoothing. Possible values are:

• off
• on

formant

Enable formant preservation when shift pitching. Possible values are:

• shifted
• preserved

pitchq

Set pitch quality. Possible values are:

• quality
• speed
• consistency

channels

Set channels. Possible values are:

• apart
• together