获取 .wav 文件长度或持续时间

Question

我正在寻找一种方法来找出 python 中音频文件（.wav）的持续时间。到目前为止，我查看了 python wave 库、mutagen、pymedia、pymad 我无法得到wav 文件的持续时间。 Pymad 给了我持续时间，但它不一致。

Answer 1

持续时间等于帧数除以帧速率（每秒帧数）：

import wave
import contextlib
fname = '/tmp/test.wav'
with contextlib.closing(wave.open(fname,'r')) as f:
    frames = f.getnframes()
    rate = f.getframerate()
    duration = frames / float(rate)
    print(duration)

---

关于 @edwards 的评论，这里有一些生成 2 通道波形文件的代码：

import math
import wave
import struct
FILENAME = "/tmp/test.wav"
freq = 440.0
data_size = 40000
frate = 1000.0
amp = 64000.0
nchannels = 2
sampwidth = 2
framerate = int(frate)
nframes = data_size
comptype = "NONE"
compname = "not compressed"
data = [(math.sin(2 * math.pi * freq * (x / frate)),
        math.cos(2 * math.pi * freq * (x / frate))) for x in range(data_size)]
try:
    wav_file = wave.open(FILENAME, 'w')
    wav_file.setparams(
        (nchannels, sampwidth, framerate, nframes, comptype, compname))
    for values in data:
        for v in values:
            wav_file.writeframes(struct.pack('h', int(v * amp / 2)))
finally:
    wav_file.close()

如果您在音频播放器中播放生成的文件，您会发现持续时间是 40 秒。如果运行上面的代码，它还会计算出持续时间为 40 秒。所以我相信帧数不受通道数的影响，并且上面的公式是正确的。

Answer 2

librosa 库可以执行此操作： librosa

import librosa
librosa.get_duration(filename='my.wav')
# note that the 'filename' keyword argument was deprecated in version
# 0.10 and replaced with 'path'. A comment in the source code says 'filename' will be removed in version 1.0

Answer 3

一个非常简单的方法是使用 soundfile （以前的 pysoundfile）。

以下是如何执行此操作的一些示例代码：

import soundfile as sf
f = sf.SoundFile('447c040d.wav')
print('samples = {}'.format(f.frames))
print('sample rate = {}'.format(f.samplerate))
print('seconds = {}'.format(f.frames / f.samplerate))

该特定文件的输出是：

samples = 232569
sample rate = 16000
seconds = 14.5355625

这与 soxi 一致：

Input File     : '447c040d.wav'
Channels       : 1
Sample Rate    : 16000
Precision      : 16-bit
Duration       : 00:00:14.54 = 232569 samples ~ 1090.17 CDDA sectors
File Size      : 465k
Bit Rate       : 256k
Sample Encoding: 16-bit Signed Integer PCM

Answer 4

我们可以使用 ffmpeg 来获取任何视频或音频文件的持续时间。

要安装 ffmpeg，请点击此链接

import subprocess
import re
 
process = subprocess.Popen(['ffmpeg',  '-i', path_of_wav_file], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
stdout, stderr = process.communicate()
matches = re.search(r"Duration:\s{1}(?P<hours>\d+?):(?P<minutes>\d+?):(?P<seconds>\d+\.\d+?),", stdout.decode(), re.DOTALL).groupdict()
 
print(matches['hours'])
print(matches['minutes'])
print(matches['seconds'])

Answer 5

import os
path="c:\\windows\\system32\\loopymusic.wav"
f=open(path,"r")

#read the ByteRate field from file (see the Microsoft RIFF WAVE file format)
#https://ccrma.stanford.edu/courses/422/projects/WaveFormat/
#ByteRate is located at the first 28th byte
f.seek(28)
a=f.read(4)

#convert string a into integer/longint value
#a is little endian, so proper conversion is required
byteRate=0
for i in range(4):
    byteRate=byteRate + ord(a[i])*pow(256,i)

#get the file size in bytes
fileSize=os.path.getsize(path)  

#the duration of the data, in milliseconds, is given by
ms=((fileSize-44)*1000)/byteRate

print "File duration in miliseconds : " % ms
print "File duration in H,M,S,mS : " % ms/(3600*1000) % "," % ms/(60*1000) % "," % ms/1000 % "," ms%1000
print "Actual sound data (in bytes) : " % fileSize-44  
f.close()

Answer 6

令 T 为两个连续样本之间的持续时间。因此，我们可以写成t = nT或t = n/Fs。

from scipy.io import wavfile
Fs, data = wavfile.read('filename.wav')
n = len(data)
t = n / Fs

Answer 7

我试图获取除“.wav”之外的不同格式的音频文件的长度，我尝试了上述一些解决方案，但对我不起作用

这对我有用：

from pydub.utils import mediainfo
mediainfo('audiofile')['duration']

Answer 8

要查找音乐文件的长度，可以使用audioread模块，

安装audioread：pip install audioread

然后使用以下代码：

import audioread
with audioread.audio_open(filepath) as f:
    totalsec = f.duration
    min,sec = divmod(totalsec,60) # divides total time in minute  and second 
                                    #and store it in min and sec variable respectively

Answer 9

pydub 的另一个解决方案：

import pydub
audio_seg = AudioSegment.from_wav('mywav.wav')
total_in_ms = len(audio_seg)

Answer 10

如果你的机器上安装了 mediainfo，你也可以使用类似这样的东西（Python 3）：

from subprocess import check_output

def get_wav_duration(path):
    return int(check_output(
        f'mediainfo --Inform="Audio;%Duration%" {path}', shell=True))

返回的结果以毫秒为单位。

Answer 11

您可以使用 soundfile.info：

import soundfile as sf

info = sf.info("my_file.wav")
print(f"The file is {info.duration} seconds long")

info< /code> 对象还具有其他有用的属性，例如 channels、samplerate 和 frames。

要安装soundfile，请使用pip install soundfile。

Answer 12

它很短，不需要模块，适用于所有操作系统：

import os
os.chdir(foo) # Get into the dir with sound
statbuf = os.stat('Sound.wav')
mbytes = statbuf.st_size / 1024
duration = mbytes / 200