midi2audio/FluidSynth: [WinError 2] The system cannot find the file specified

Question

I am using the python package midi2audio to translate a midi file into a WAV.

Running:

filepath = 'C:/Users/Jack/Documents/GaTech/Research/Code/Data/Midi/C4/test12.mid'
soundfont = 'C:/Users/Jack/Downloads/weedsgm3.sf2'    
fs = FluidSynth(soundfont)


if os.path.isfile(filepath):
   print('The File Exists')
else: 
   print('The File does not exist')

fs.midi_to_audio(filepath, 'output.wav')

Outputs:

The File Exists
FileNotFoundError: [WinError 2] The system cannot find the file specified

To be clear the error is referencing the file specified in filepath and not soundfont. There is little documentation on the package so I am not sure what to do.

Has anyone with experience with midi2audio experienced the same issue and know what is the root of the problem?

Answer 1

fs = FluidSynth()

This creates a FluidSynth object, with the default values for all the constructor's parameters.

FluidSynth(sample_rate=22050)

This creates a second FluidSynth object. The object reference is not assigned to any variable, so it is thrown away immediately.

FluidSynth(soundfont)

And a third object.

fs.midi_to_audio(filepath, 'output.wav')

The object referenced by fs uses the default sound font and the default sample rate.

You have to give all the parameters to the constructor at once:

fs = FluidSynth(sound_font=soundfont, sample_rate=22050)

(And it might be a good idea to specify the full path to the output file.)