"unexpected EOF" when importing generated MIDI

[sporkl]

Hello,

I've been using mm to generate MIDI files. However, when I try to import these files into Musescore, I get the error "Import failed: bad midifile: unexpected EOF." I'm not able to import them into Logic Pro either.

Here's a minimal program that has the issue:

open Mm_midi
let writer = new MIDI.IO.Writer.to_file 44100 "test_out.mid" in
writer#note_on 1 64 1.0;
writer#advance 44100;
writer#note_off 1 64 0.0;
writer#close

I should note that I am able to import the generated files into Bitwig Studio. I can then re-export, and those re-exported files work as expected. So I'm all set for now, but just wanted to create this issue in case it's useful to know about.

Please let me know if I should provide any additional info!

Thanks