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python273/midi_tempo_convert.py

Created January 21, 2020 00:06
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midi_tempo_convert.py
import time
from mido import MidiFile
from mido import bpm2tempo, tempo2bpm
mid = MidiFile('some.midi')
new_tempo = 75
# track numbers are hardcoded, might be different
old_tempo = tempo2bpm(mid.tracks[0][2].tempo)
mid.tracks[0][2].tempo = bpm2tempo(new_tempo)
for i in mid.tracks[1]:
if not i.time:
continue
i.time = int(i.time * (new_tempo/old_tempo))
mid.save(f'{time.time()}.midi')
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