MIDIUtil | A pure Python library for creating multi-track MIDI files | Audio Utils library

I want to write a MIDI file with the inputs I receive from the digital piano I have connected. I am using pygame.midi to open an input port and midiutil to write the MIDI file. What I can't wrap my head around is the timing. For example, in addNote(track, channel, pitch, time, duration, volume), how do I know what time and duration of a note is? When reading a note, I get pitch and volume just fine, but the others I have no idea... I tried using the timestamp but to no avail, it places the note really far away in the MIDI file.

So, how do I compute the 'time' and 'duration' of a note?

I was writing a program that used the windows midi interface, and at some point I was following the definition of a symbol and ended up in one of the windows headers. I must have accidentally edited it before closing it because now when I try to compile my code, I get literally hundreds of errors like:

I want to convert a sequence of notes (defined by time, duration, pitch) to a audio-file. For doing so, I thought creating a midi first and then compile it to wav is the way to go.

I'm quite new to audio processing and MIDI-Files, so even though I read several tutorials, it can be, that I didn't get the point.

Edit: I found the problem, see solution below.

What's the problem

Writing notes at a specific time with a specific duration via python's MIDIUtil doesn't work as expected. In fact, the time in seconds, where a note is placed heavily depends on the track's bpm, even though I think I took the bpm into account, when converting the note time to MIDI's time measure in quarter notes.

What I've tried

I'm creating a MIDI track with a given bpm. Then I'm converting a note's event time via t_{quarter} = t_{seconds} * bpm/60

Example

I'm writing with the following code two notes, the last at t=5 seconds with a duration of 1s; i.e. I'm expecting a midi-file with lasts 6seconds. But at a bpm=600, the file is 14s long. At a bpm=100 it's almost the expected 6s.

Here's my code