音乐视频转音频，分割成单个文件

1. 从youbube上下载音乐视频，MP4格式

2. MP4格式转MP3格式

方法1：

方法2

import os

import sys

from moviepy.editor import *

def to_mp3(filename):

mp3file = filename[:-3] + 'mp3'

print(mp3file)

video = VideoFileClip(os.path.join("./","",filename))

video.audio.write_audiofile(os.path.join("./","",mp3file))

def usage():

print('python mp4-to-mp3.py filename')

def main():

filename = sys.argv[1]

print(filename)

to_mp3(filename)

if __name__ == "__main__":

usage()

main()

3. 利用ffmpeg分割MP3文件（Mac系统），根据静音间隔来分割歌曲

import subprocess as sp

import sys

import numpy

FFMPEG_BIN = "ffmpeg"

print ('ASplit.py <src.mp3> <silence duration in seconds> <threshold amplitude 0.0 .. 1.0>')

print('eg. python asplit.py 1_1.mp3 3 0.1')

src = sys.argv[1]

dur = float(sys.argv[2])

thr = int(float(sys.argv[3]) * 65535)

f = open('%s-out.sh' % src, 'w+')

tmprate = 22050

len2 = dur * tmprate

buflen = int(len2 * 2)

# t * rate * 16 bits

oarr = numpy.arange(1, dtype='int16')

# just a dummy array for the first chunk

command = [ FFMPEG_BIN,

'-i', src,

'-f', 's16le',

'-acodec', 'pcm_s16le',

'-ar', str(tmprate), # ouput sampling rate

'-ac', '1', # '1' for mono

'-'] # - output to stdout

pipe = sp.Popen(command, stdout=sp.PIPE, bufsize=10**8)

tf = True

pos = 0

opos = 0

part = 0

while tf :

raw = pipe.stdout.read(buflen)

if raw == '' :

tf = False

break

try:

arr = numpy.fromstring(raw, dtype = "int16")

rng = numpy.concatenate([oarr, arr])

mx = numpy.amax(rng)

except ValueError: #raised if `y` is empty.

print('ValueError')

break

#pass

if mx <= thr :

# the peak in this range is less than the threshold value

trng = (rng <= thr) * 1

# effectively a pass filter with all samples <= thr set to 0 and > thr set to 1

sm = numpy.sum(trng)

# i.e. simply (naively) check how many 1's there were

print('sm={}, len2={}'.format(sm, len2))

apos1 = pos + dur * 0.5

if sm >= len2 and (apos1 - opos) > 20:

part += 1

apos = pos + dur * 0.5

print (mx, sm, len2, apos)

#f.write('ffmpeg -i "%s" -ss %f -to %f -c copy -y "%s-p%04d.mp3"\r\n' % (src, opos, apos, src, part))

f.write('ffmpeg -i {} -ss {} -to {} -c copy -y {}p{:02n}.mp3 &\r\n'.format(src, opos, apos, src[:2], part))

opos = apos

pos += dur

oarr = arr

part += 1

#f.write('ffmpeg -i "%s" -ss %f -to %f -c copy -y "%s-p%04d.mp3"\r\n' % (src, opos, pos, src, part))

#f.write('ffmpeg -i {} -ss {} -to {} -c copy -y {}p{:04n}.mp3 \r\n'.format(src, opos, apos, '', part))

f.close()

输出结果：（文件1_1.mp3-out.sh）

ffmpeg -i 1_1.mp3 -ss 0 -to 349.5 -c copy -y 1_p01.mp3 &

ffmpeg -i 1_1.mp3 -ss 349.5 -to 685.5 -c copy -y 1_p02.mp3 &

ffmpeg -i 1_1.mp3 -ss 685.5 -to 934.5 -c copy -y 1_p03.mp3 &

ffmpeg -i 1_1.mp3 -ss 934.5 -to 1174.5 -c copy -y 1_p04.mp3 &

ffmpeg -i 1_1.mp3 -ss 1174.5 -to 1441.5 -c copy -y 1_p05.mp3 &

ffmpeg -i 1_1.mp3 -ss 1441.5 -to 1657.5 -c copy -y 1_p06.mp3 &

ffmpeg -i 1_1.mp3 -ss 1657.5 -to 1921.5 -c copy -y 1_p07.mp3 &

ffmpeg -i 1_1.mp3 -ss 1921.5 -to 2665.5 -c copy -y 1_p08.mp3 &

ffmpeg -i 1_1.mp3 -ss 2665.5 -to 2926.5 -c copy -y 1_p09.mp3 &

ffmpeg -i 1_1.mp3 -ss 2926.5 -to 3346.5 -c copy -y 1_p10.mp3 &

ffmpeg -i 1_1.mp3 -ss 3346.5 -to 3601.5 -c copy -y 1_p11.mp3 &

ffmpeg -i 1_1.mp3 -ss 3601.5 -to 3877.5 -c copy -y 1_p12.mp3 &

ffmpeg -i 1_1.mp3 -ss 3877.5 -to 4144.5 -c copy -y 1_p13.mp3 &

4. 从大MP3文件抽取单个MP3格式的歌曲

运行1_1.mp3-out.sh文件，最终结果如下：

5. 完整工作流启动代码

输入：同级目录下MP4文件列表

输出：分割好的MP3文件

import os

import sys

import glob

import os.path

from os import path

import mp4_to_mp3

def to_sh(filename):

mp3file = filename[:-3] + 'mp3'

if path.exists(mp3file):

print('exists:'+mp3file)

return mp3file

mp4_to_mp3.to_mp3(filename)

return mp3file

mylist = [f for f in glob.glob("*.mp4")]

#print(mylist)

for c in mylist:

print(c)

mp3file = to_sh(c)

cmd = 'python asplit.py ' + mp3file +' 3 0.1'

os.system(cmd)

shfile = mp3file + '-out.sh'

cmd = 'chmod +x ' + shfile

os.system(cmd)

cmd = './' + shfile

os.system(cmd)

最后编辑于：2022.03.08 23:10:05