A simple Python module to speed up (or slow down) audio. It also comes with a commandline interface and a Flask server.
To install speedup.py run:
pip install speedup.py
The speedup.py module has optional dependencies required for the CLI and API modules. Run one of the three lines below to:
pip install speedup.py[cli] # Only install CLI dependencies
pip install speecup.py[server] # Only install server dependencies
pip install speedup.py[cli,server] # Install dependencies for both
Assuming you have soundfile for reading in audio files, speeding up audio from a file called audio.mp3 by a factor of 1.5 takes four lines of Python code:
from speedup import speedup
import soundfile as sf
audio, samplerate = sf.read("audio.mp3")
spedup_audio = speedup(audio, 1.5)The speedup function returns the sped up audio as a NumPy array, which you can then save to a file like so:
sf.write("spedup-audio.mp3", spedup_audio, samplerate)The CLI abstracts everything in the previous section away.
To speed up audio.mp3 by a factor of 1.5, run:
speedup audio.mp3 1.5
Despite the project's name, multipliers below 1 work as well. The audio will be slowed down in this case:
speedup audio.mp3 0.75
In this case, the sped up audio is saved to audio-1.5x.mp3 by default. You can specify the output file using --output-file:
speedup audio.mp3 1.5 --output-file spedup.mp3
Since the resample operation takes some time, the --play option lets you hear your spedup audio without resampling:
speedup audio.mp3 1.5 --play
Using --play prevents saving the audio to a file, since the exact same file would be created, except the sample rate would be multiplied. This is because compressed audio formats (especially MPEG-3) don't support custom sample rates.
The --output-file and --play options are mutually exclusive.
You can run the Flask development server with:
python -m speedup.api
For production environments however, you should use a WSGI server like gunicorn:
pip install gunicorn
gunicorn -w 4 speedup.api:app
To build the Python package, run the below commands in your terminal:
git clone https://github.com/trustytrojan/speedup.py
cd speedup.py
python -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt
python -m build