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How one can Convert MIDI to MP3 in Python – A Fast Overview

To transform MIDI to MP3 in Python, two nice methods is utilizing the pydub and fluidsynth libraries:

  • pydub is a high-level audio library that makes it straightforward to work with audio information.
  • fluidsynth is a software program synthesizer for producing audio from MIDI.

Listed here are three straightforward steps to transform MIDI to MP3 in Python:

🎵 Step 1: Set up the pydub and fluidsynth libraries:

pip set up pydub

You additionally want to put in fluidsynth (see beneath, preserve studying this text). The set up course of for fluidsynth varies by working system. For instance, on Ubuntu, you may set up it through apt:

sudo apt-get set up fluidsynth

🎵 Step 2: Obtain a SoundFont file.

SoundFont information comprise samples of musical devices, and are required by fluidsynth to generate audio from MIDI. A well-liked free SoundFont is GeneralUser GS, which will be downloaded from the schristiancollins web site.

🎵 Step 3: Convert MIDI to MP3.

Use the next Python code to transform a MIDI file to MP3:

import os
from pydub import AudioSegment

def midi_to_mp3(midi_file, soundfont, mp3_file):
    # Convert MIDI to WAV utilizing fluidsynth
    wav_file ='.mp3', '.wav')
    os.system(f'fluidsynth -ni {soundfont} {midi_file} -F {wav_file} -r 44100')

    # Convert WAV to MP3 utilizing pydub
    audio = AudioSegment.from_wav(wav_file)
    audio.export(mp3_file, format="mp3")

    # Take away short-term WAV file
    os.take away(wav_file)

# Instance utilization:
soundfont="path/to/GeneralUser GS.sf2"
midi_to_mp3(midi_file, soundfont, mp3_file)

Substitute 'enter.mid', 'path/to/GeneralUser GS.sf2', and 'output.mp3' with the suitable file paths. This script will convert the desired MIDI file to MP3 utilizing the desired SoundFont.

Let’s discover some background info and options subsequent. 👇

🎵 Understanding Midi to MP3 Conversion

MIDI (Musical Instrument Digital Interface) information are helpful for creating and enhancing music notes, however they don’t seem to be a traditional audio format like MP3.

  • 🎼 MIDI information retailer musical info as digital knowledge, comparable to be aware sequences, instrument selections, and timing directions. MIDI information are the digital representations of musical compositions and retailer important knowledge, comparable to notes, pitch, and length. These information play a big position in music manufacturing, schooling, and analysis.
  • 🎵 In distinction, MP3 information retailer compressed audio knowledge, sometimes captured from a stay efficiency or created synthetically.

Changing MIDI information to MP3 information means that you can play music on numerous gadgets, share them simply, and retailer them in a extra accessible format. Plus, MP3 information are sometimes smaller in measurement in comparison with MIDI information, making them extra appropriate for distribution.

When changing from MIDI to MP3, your laptop makes use of a software program synthesizer to generate audio primarily based on the MIDI knowledge after which compress it into an MP3 file.

To carry out this conversion utilizing Python, you may make the most of libraries comparable to midi2audio and FluidSynth synthesizer to course of MIDI information, generate audio, and ultimately put it aside in a desired format, like MP3. The midi2audio library offers a handy command-line interface for quick conversions and batch processing.

💡 Notice: There’s an important distinction in how MIDI and MP3 information retailer and symbolize audio knowledge. Whereas MIDI information present directions for recreating the music, MP3 information instantly retailer the audio knowledge, compressed for environment friendly storage and playback. This distinction shapes the conversion course of, which requires synthesizing and compressing audio knowledge from the digital directions contained within the MIDI file.

Introduction to FluidSynth

FluidSynth Overview

FluidSynth is a strong and easy-to-use software program synthesizer that means that you can convert MIDI information into audio format with high-quality output. It’s an open-source venture and will be simply built-in into numerous functions, together with Python tasks, to generate music by processing MIDI occasions. With FluidSynth, you may load SoundFont information (normally with the extension .SF2) to outline devices and customise the sound era course of.

As a Python developer, you may leverage FluidSynth so as to add audio processing capabilities to your tasks. By utilizing a easy Python interface, you may create the whole lot from command-line functions to extra complicated, GUI-based options. Instance:

FluidSynth().midi_to_audio('enter.mid', 'output.wav')

FluidSynth Synthesizer

The core of FluidSynth is its software program synthesizer, which works equally to a MIDI synthesizer. You load patches and set parameters, after which ship NOTEON and NOTEOFF occasions to play notes. This lets you create lifelike audio output, mimicking the sound of a stay efficiency or an digital instrument.

To get began with FluidSynth in Python, think about using the midi2audio bundle, which offers an easy-to-use interface to FluidSynth. With midi2audio, you may simply convert MIDI information into audio format, and even play MIDI information instantly, by means of a easy but highly effective API.

In your Python code, you’ll import FluidSynth and midi2audio, then load a SoundFont file to outline your instrument. As soon as that’s finished, you may ship MIDI occasions to the synthesizer and both play the generated audio instantly or put it aside to a file for later playback.

💡 Sources: FluidSynth documentation and the midi2audio GitHub repository.

Putting in Obligatory Packages

Bundle Set up

To get began with changing MIDI to MP3 information in Python, you’ll want to put in a couple of important packages. First, you’ll need the midi2audio bundle. You may set up it utilizing pip by operating the next command in your terminal or command immediate:

pip set up midi2audio

This bundle will give you the required instruments to simply synthesize MIDI information and convert them to audio codecs like MP3 1.

Command Line Utilization

After you have put in the midi2audio bundle, you can begin utilizing its command-line interface (CLI). The CLI means that you can carry out MIDI to audio conversion duties rapidly with out having to manually write a Python script.

Right here’s an instance of a primary command that converts a MIDI file to an audio file:

midi2audio enter.mid output.wav

By default, the output file can be in WAV format. If you wish to generate an MP3 file as a substitute, you’ll want so as to add an additional step. First, set up the FFmpeg utility in your system. You could find the set up directions right here.

After putting in FFmpeg, you may convert the WAV file to MP3 utilizing the next command:

ffmpeg -i output.wav output.mp3

Now you’ve efficiently transformed a MIDI file to MP3 utilizing the command-line instruments supplied by midi2audio and FFmpeg. With these highly effective packages and CLI, you may simply automate and batch course of a number of MIDI to MP3 conversions as wanted.

Changing Midi to Audio with Midi2Audio

Utilizing Midi2Audio

Midi2Audio is a useful Python library that simplifies changing MIDI to audio information utilizing the FluidSynth synthesizer. To begin utilizing Midi2Audio, first, you should set up it by operating pip set up midi2audio. As soon as put in, you should utilize the library’s Python and command-line interface for synthesizing MIDI information to audio or for simply enjoying them.

Right here is an instance of use Midi2Audio in a Python script:

from midi2audio import FluidSynth

fs = FluidSynth()
fs.midi_to_audio('enter.mid', 'output.wav')

On this instance, you might be configuring a FluidSynth occasion after which utilizing the midi_to_audio() technique to transform an enter MIDI file to an output WAV file.

Batch Processing

Midi2Audio shines on the subject of batch processing, permitting you to transform a number of MIDI information to audio in a single operation. To realize this, you may merely iterate over a set of MIDI information and name the midi_to_audio() technique for every file.

For instance:

from midi2audio import FluidSynth
import os


fs = FluidSynth()

for file in os.listdir(input_folder):
    if file.endswith('.mid'):
        input_file = part of(input_folder, file)
        output_file = part of(output_folder,'.mid', '.wav'))
        fs.midi_to_audio(input_file, output_file)

Right here, you might be iterating by means of all of the MIDI information within the “midifiles” listing and changing them into WAV audio information throughout the “audiofiles” listing.

Changing Midi to MP3 utilizing Timidity

TiMidity++ is a strong instrument that may deal with numerous Midi codecs and remodel them into MP3 information. Right here, you’ll discover info on the professionals and cons of utilizing TiMidity++, adopted by a step-by-step course of for conversion.

Execs and Cons of Utilizing Timidity


  • Confidence in output high quality: TiMidity++ is extensively recognized for producing high-quality MP3 information from Midi enter.
  • Cross-platform assist: It really works seamlessly on Home windows, Linux, and macOS, making it accessible to many customers.
  • Free and open-source: As a free and open-source instrument, you don’t want to fret about licensing charges or limitations on its use.


  • Command-line interface: TiMidity++ has a command-line interface (CLI) which could show difficult for customers unfamiliar with command line instruments.
  • Much less user-friendly: As a result of CLI nature of TiMidity++, it will not be as user-friendly as different software program choices which have a graphical consumer interface (GUI).

Step-by-Step Course of

  1. Set up TiMidity++: Obtain and set up TiMidity++ in your system. You could find set up directions for numerous platforms on its official web site.
  2. Acquire your Midi file: Be sure to have the Midi file you’d prefer to convert to MP3 prepared in your laptop.
  3. Open the command immediate or terminal: In your command immediate or terminal, navigate to the listing containing your Midi file.
  4. Run the TiMidity++ command: Execute the next command in your command immediate or terminal, changing <enter.mid> along with your Midi file and <output.mp3> with the specified output file title:
timidity <enter.mid> -Ow -o - | ffmpeg -i - -acodec libmp3lame -ab 64k <output.mp3>
  1. Get pleasure from your MP3 file: As soon as the method completes, you’ll find the transformed MP3 file in the identical listing as your authentic Midi file.

That’s it! You could have now efficiently transformed a Midi file to MP3 utilizing TiMidity++.

Extra Instruments and Libraries

On this part, we’ll focus on some extra instruments and libraries that may make it easier to convert MIDI to MP3 in Python.


SOX is a command-line utility that may course of, play, and manipulate audio information. It helps numerous audio codecs and can be utilized alongside different libraries to carry out the MIDI to MP3 conversion. To make use of it in your venture, you may both set up its command line instrument or use it as a Python library.

FFMPEG, however, is a strong multimedia instrument that may deal with audio, video, and pictures. It additionally helps quite a few codecs, so you should utilize it to transform your MIDI information to MP3 or different codecs.

Mix SOX and FFMPEG to successfully course of and convert your MIDI information. First, use SOX to transform the MIDI information to an middleman audio format, comparable to WAV. Then, make the most of FFMPEG to transform the WAV information to MP3. This workflow ensures a easy, environment friendly conversion course of.

Libsndfile and Channels

One other helpful library to contemplate is libsndfile, which is a C library for studying and writing information containing sampled sound. It helps many frequent audio codecs, together with WAV, AIFF, and extra.

For Python builders, there’s a wrapper library referred to as pysoundfile that makes it straightforward to make use of libsndfile in your Python tasks. Incorporating libsndfile with different MIDI processing libraries may also help you construct an entire MIDI to MP3 conversion resolution.

When working with audio, you might also encounter completely different channels in audio information, comparable to mono, stereo, and encompass sound. Libraries comparable to SOX, FFMPEG, and libsndfile can handle completely different channel configurations, guaranteeing your output MP3 information have the specified variety of channels and audio high quality.

Issues for Completely different Working Methods

When working with Python to transform MIDI to MP3 information, it’s important to contemplate the variations and necessities for numerous working techniques. On this part, we’ll focus on particular issues for Home windows OS, Linux, and Ubuntu 20.04.

Home windows OS

On Home windows techniques, you should utilize a bundle like midi2audio to simply convert MIDI information to audio codecs like MP3. To put in this bundle, run:

pip set up midi2audio

Needless to say this bundle requires FluidSynth to work. You may set up FluidSynth for Home windows from right here, and bear in mind to arrange your setting variables to allow the bundle to seek out FluidSynth’s libraries and executables. Lastly, don’t overlook to obtain an acceptable soundfont file, as this may considerably impression the standard of the transformed audio.


For Linux customers, the method is just like Home windows. First, set up midi2audio utilizing pip:

pip set up midi2audio

Subsequent, you’ll want to put in FluidSynth by means of your distribution’s bundle supervisor. For instance, on Debian-based techniques like Ubuntu, execute the next command:

sudo apt-get set up fluidsynth

As with Home windows, guarantee you’ve a soundfont file that fits your wants. You could find a number of free soundfont information on-line. When you’re trying to find an alternate command-line instrument, think about using SoX – Sound eXchange because it’s versatile and well-suited for scripting and batch processing.

Ubuntu 20.04

In Ubuntu 20.04, the method is, for probably the most half, the identical as different Linux distributions. Since Ubuntu is predicated on Debian, you may comply with the set up course of talked about within the Linux part above.

To reiterate, set up midi2audio utilizing pip:

pip set up midi2audio

Then, use the bundle supervisor to put in FluidSynth:

sudo apt-get set up fluidsynth

Bear in mind to obtain your required soundfont file to attain the most effective audio high quality for the transformed MP3 information.

Incessantly Requested Questions

How can I exploit FluidSynth to transform MIDI to MP3 in Python?

To make use of FluidSynth for MIDI to MP3 conversion in Python, first, you should set up the midi2audio library, which acts as a wrapper for FluidSynth. You may set up this bundle utilizing pip set up midi2audio. Now, use the next code to carry out the conversion:

from midi2audio import FluidSynth

fs = FluidSynth()
fs.midi_to_audio('enter.mid', 'output.mp3')

For extra customization choices, try the midi2audio‘s PyPI web page.

What are the most effective Python libraries for MIDI to MP3 conversion?

The most well-liked Python libraries for MIDI to MP3 conversion are FluidSynth, which can be utilized with the midi2audio bundle, and Timidity++. FluidSynth is thought for its ease of use and non-realtime synthesis. Timidity++ normally requires extra setup and configuration, however it’s a highly effective resolution that’s usually utilized in Linux-based techniques.

How do I extract notes from MIDI information utilizing Python?

To extract notes from MIDI information, you should utilize the mido library. First, set up it through pip set up mido. The next code will make it easier to to extract notes from a MIDI file:

import mido

midi_file = mido.MidiFile('enter.mid')
for msg in
    if msg.sort == 'note_on':
        print('Notice:', aware, 'Velocity:', msg.velocity)

Discover the mido documentation for extra strategies and choices.

Can I convert MIDI to MP3 utilizing VLC or Audacity with a Python script?

Sure, you should utilize VLC or Audacity for MIDI to MP3 conversion by means of a Python script. You should use the subprocess module to execute command-line arguments for each functions. Nevertheless, these options require extra installations and may not be as streamlined as utilizing devoted Python libraries like FluidSynth.

Are there any free Python instruments for MIDI to MP3 conversion?

There are a number of free Python libraries that supply MIDI to MP3 conversion. Among the widespread choices embody FluidSynth mixed with the midi2audio bundle, Timidity++, and utilizing subprocess to work together with command-line functions like VLC or Audacity.

How can I learn textual content from MIDI information utilizing Python?

To learn textual content from MIDI information, you may once more depend on the mido library. The next code snippet demonstrates extract textual content from a MIDI file:

import mido

midi_file = mido.MidiFile('enter.mid')
for observe in midi_file.tracks:
    for msg in observe:
        if msg.sort == 'textual content':
            print(msg.textual content)

By utilizing mido, you may entry numerous varieties of MIDI messages, together with textual content occasions, and manipulate the MIDI knowledge as wanted.

Python gives utilities like Mido that will help you analyze and remodel MIDI information seamlessly. Utilizing Mido, you may learn, write, and edit MIDI information successfully. It allows you to extract priceless info, comparable to be aware sequences, instrument particulars, and timing knowledge.

Mido offers a strong interface to work with MIDI knowledge. It’s well-suited for coping with MIDI processing-related duties and will be built-in seamlessly into your Python tasks.

💡 Beneficial: Creating Audio Information with Mido in Python



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