1. 从youbube上下载音乐视频，MP4格式
推荐：
https://github.com/ErikZhou/YouPy
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
') 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)