1. 從youbube上下載音樂(lè)視頻，MP4格式
推薦：
https://github.com/ErikZhou/YouPy
2. MP4格式轉(zhuǎn)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系統(tǒng)），根據(jù)靜音間隔來(lái)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()
輸出結(jié)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. 從大MP3文件抽取單個(gè)MP3格式的歌曲
運(yùn)行1_1.mp3-out.sh文件，最終結(jié)果如下：
5. 完整工作流啟動(dòng)代碼
輸入：同級(jí)目錄下MP4文件列表
輸出：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)
