pyrubberband

pyrubberband is a Python wrapper for the rubberband command-line tool. To use it on macOS, you must install the rubberband library via Homebrew using the following command:

brew install https://gist.githubusercontent.com/faroit/b67c1708cdc1f9c4ddc9/raw/942bbedded22f05abab0d09b52383e7be4aee237/rubberband.rb

Use pyrb.time_stretch(y, sr, ratio, rbargs=None) to change the playback speed of an audio signal without changing its pitch.

• y: The audio signal (numpy array).
• sr: The sampling rate.
• ratio: The stretch factor (e.g., 2.0 for double speed).
• rbargs: A dictionary of command-line arguments supported by the Rubberband CLI. Keys are the flags (e.g., '-c') and values are the argument values (e.g., '5'). For flags without values, use an empty string ''.

import soundfile as sf
import pyrubberband as pyrb

# Read mono wav file
y, sr = sf.read("test.wav")

# Play back at double speed
y_stretch = pyrb.time_stretch(y, sr, 2.0)

# Use custom Rubberband CLI arguments
y_stretch = pyrb.time_stretch(y, sr, 2.0, rbargs={'-c':'5', '--no_transients':''})