python - wave.error : # channels not specified 错误

Question

我正在尝试使用 wave 模块编辑 wav 文件的长度。但是，似乎我无法到达任何地方，因为我不断收到未指定 channel 数的相同错误。尽管如此，当我写一些东西来查看 channel 数时，我仍然会遇到该错误，或​​者当我尝试设置 channel 数时，如下所示:

def editLength(wavFile):
   file = wave.open(wavFile, 'w')
   file.setnchannels(file.getnchannels())
   x = file.getnchannels()
   print (x)

Answer 1

来自 https://docs.python.org/3.7/library/wave.html#wave.open

wave.open(file, mode=None)

If file is a string, open the file by that name, otherwise treat it as a file-like
object.

mode can be:
'rb'    Read only mode.
'wb'    Write only mode.

Note that it does not allow read/write WAV files.

您尝试从 WAV 文件读取和写入，文件对象在第一个 file.getnchannels() 时没有指定 channel 数。

def editLength(wavFile):
    with open(wavFile, "rb") as file:
        x = file.getnchannels()
        print(x)

如果你想编辑文件你应该先从原始文件中读取并写入一个临时文件。然后将临时文件复制到原始文件上。