查找mp3文件的长度

Question

So i have the code:

import glob,os
import random


path = 'C:\\Music\\'
aw=[]
for infile in glob.glob( os.path.join(path,'*.mp3') ):
    libr = infile.split('Downloaded',1)



    aw.append(infile)
aww = -1
while 1:
    aww += 1
    print len(aw),aww

    random.shuffle(aw)
    awww = aw[aww]
    os.startfile(awww)

but all it does is go through all of the songs without stopping. I thought if I could find the length of the song that is currently playing, I could use the "time" module to keep going after the song is done with the (sleep) attribute. However, I couldn't find how to get the length of the song on windows. Does anyone know a solution to my probleme?

Answer 1

You can use mutagen to get the length of the song (see the tutorial ):

from mutagen.mp3 import MP3
audio = MP3("example.mp3")
print(audio.info.length)

Answer 2

You can use FFMPEG libraries:

    args=("ffprobe","-show_entries", "format=duration","-i",filename)
    popen = subprocess.Popen(args, stdout = subprocess.PIPE)
    popen.wait()
    output = popen.stdout.read()

and the output will be:

[FORMAT]
duration=228.200515
[/FORMAT]

Answer 3

You can also get this using eyed3, if that's your flavor by doing:

import eyed3
duration = eyed3.load('path_to_your_file.mp3').info.time_secs

Note however that this uses sampling to determine the length of the track. As a result, if it uses variable bit rate, the samples may not be representative of the whole, and the estimate may be off by a good degree (I've seen these estimates be off by more than 30% on court recordings).

I'm not sure that's much worse than other options, but it's something to remember if you have variable bit rates.

Answer 4

Newer versions of python-ffmpeg have a wrapper function for ffprobe . An example of getting the duration is like this:

import ffmpeg
print(ffmpeg.probe('in.mp4')['format']['duration']))

Found at: https://github.com/kkroening/ffmpeg-python/issues/57#issuecomment-361039924

Answer 5

Maybe do the playing also within Python, ie don't use os.startfile , use some Python library to play the file.

I have recently written such a library/module, the musicplayer module ( on PyPI ). Here is a simple demo player which you can easily extend for your shuffle code.

Just do easy_install musicplayer . Then, here is some example code to get the length:

class Song:
    def __init__(self, fn):
        self.f = open(fn)
    def readPacket(self, bufSize):
        return self.f.read(bufSize)
    def seekRaw(self, offset, whence):
        self.f.seek(offset, whence)
        return self.f.tell()

import musicplayer as mp

songLenViaMetadata = mp.getMetadata(Song(filename)).get("duration", None)
songLenViaAnalyzing = mp.calcReplayGain(Song(filename))[0]