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Scripted Usage (deprecated)

Installation

Dependencies

This project requires libsndfile, rubberband-cli, ffmpeg to be installed on the system to work.

apt-get update && apt-get install -y libsndfile1 rubberband-cli ffmpeg
brew install libsndfile ffmpeg rubberband

Python Dependencies

Python Version

madmom package supports up to python 3.8, it's recommended to is this version.

Installation

To install the projects dependencies run:

pip install -r requirements.txt

! if you get an error about Cython refer to this tip.

Package Used For
Cython Required by madmom package.
Numpy Handling audio data.
pyrubberband Python wrapper for rubberband, a perfectly capable time stretcher & pitch shifter.
yodel Audio frequency filtering capabilities.
essentia Format resilient audio loading and it's MIR tools.
madmom State of the art beat-tracking.

A note on the Python dependencies

Installing madmom package alone, if Cython package is not installed before hand, can fail. To solve this problem, you can pip install cython before installing madmom package.

Example Usage

Transitioning Between Two Songs

from pycrossfade import Song, crossfade, save_audio
# creating master and slave songs
master_song = Song('/path/to/master_song.mp3')
slave_song = Song('/path/to/slave_song.mp3')
# creating crossfade with bpm matching
output_audio = crossfade(master_song, slave_song, len_crossfade=8, len_time_stretch=8)
# saving the output
save_audio(output_audio, '/path/to/save/mix.wav')

Transitioning Between Multiple Songs

from pycrossfade import Song, crossfade_multiple, save_audio
# creating songs
song_list = [
  Song('/path/to/song_one.mp3'),
  Song('/path/to/song_two.mp3'),
  Song('/path/to/song_three.mp3'),
]
# creating crossfade with bpm matching
output_audio = crossfade_multiple(song_list, len_crossfade=16, len_time_stretch=8)
# saving the output
save_audio(output_audio, '/path/to/save/mix_multiple.wav')

Transitioning Between Songs On Specific Bars

from pycrossfade import Song, crossfade_multiple, crop_audio_and_dbeats, import save_audio
# creating songs
song_one = Song('/path/to/song_one.mp3')
song_two = Song('/path/to/song_two.mp3')
song_three = Song('/path/to/song_three.mp3')

song_list = [
    crop_audio_and_dbeats(song_one, 10, 35),
    crop_audio_and_dbeats(song_two, 30, 55),
    crop_audio_and_dbeats(song_three, 50, 75),
]
# creating crossfade with bpm matching
output_audio = crossfade_multiple(song_list, len_crossfade=8, len_time_stretch=8)
# saving the output
save_audio(output_audio, '/path/to/save/mix_multiple_specific_bars.wav')