Music21操纵特定乐器

问题描述

我正在Python中使用Music21从MIDI文件读取，我只想处理使用某种乐器的音轨.例如，如果我的MIDI文件中有两条使用钢琴的音轨，那么我希望能够打印音符，更换乐器等.

I am using Music21 in Python to read from a MIDI file and I want to only deal with the tracks that use a certain instrument.For example, if, in my MIDI file I have two tracks that use piano I want to be able to print the notes, change the instrument, etc.

现在，我有一个具有多个音轨(鼓，小号等)的文件，而我只是在弄乱它，试图用另一把乐器代替另一把乐器.但是，当我这样做时，我遇到了一个错误，尽管成功更换了乐器，但某些音轨还是被完全删除了(假设它不是被删除的其中一个).

Right now I have a file with multiple tracks (drums, trumpet etc.) and I am just messing around with it trying to replace a certain instrument with another. However, when I do I get an error and some of the tracks are removed completely although the instrument is successfully changed (assuming it's not one of the ones removed).

这是我当前的代码:

from music21 import converter, instrument
s = converter.parse('smells.mid')

s = instrument.partitionByInstrument(s)

s.parts[2].insert(0, instrument.Vocalist())


s.write('midi', 'newfilename.mid')

这是我得到的错误:

midi.base.py: WARNING: Conversion error for <MidiEvent PROGRAM_CHANGE, t=0, track=1, channel=1>: Got incorrect data for <MidiEvent PROGRAM_CHANGE, t=0, track=1, channel=1> in .data: None,cannot parse Program Change; ignored.

推荐答案

这就是我正在尝试做的事情:

Here's what I was trying to do:

def printInstrument(self, strm, inst):
    s2 = instrument.partitionByInstrument(strm)
    if s2 is not None:
    #print all the notes the instrument plays
        for i in s2.recurse().parts:
            if i.partName == inst:
                iNotes = i.notesAndRests.stream()
                for j in iNotes.elements:
                    if type(j) == chord.Chord:
                        #handle chords
                    elif j.name == "rest":
                        #handle rests
                    else:
                        #handle notes

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