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Last active November 9, 2018 20:59
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#!/usr/local/bin/python3
"""
Requires you to install ffmpeg with all options (or at least the rubberband module):
https://gist.github.com/Piasy/b5dfd5c048eb69d1b91719988c0325d8#gistcomment-2571754
Example usage:
$ ./convert_pitch_by_semitones.py /input.mp3 /output.mp3 -2
"""
import sys
import subprocess
from math import pow
[_, input_file, output_file, semitones] = sys.argv
actual_pitch_difference = pow(2, (int(semitones) / 12))
subprocess.run(["ffmpeg", "-i", input_file, "-af", "rubberband=pitch=%.2f:pitchq=quality" % (actual_pitch_difference,), "-vn", output_file])
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