的预演。
这下文件又小了，不必挂着小尾巴m4a了。
还是老地方，https://github.com/cnbeining/audioblacker
代码下面。
#!/usr/bin/env python
#coding:utf-8
# Author: Beining --<ACICFG>
# Contact: http://www.cnbeining.com/ |https://github.com/cnbeining/audioblacker
# Purpose: Patch video's audio part to bypass Letvcloud's transcode.
# Created: 08/21/2014
# LICENSE: GNU v2
import sys
import os
import os, sys, subprocess, shlex, re
from subprocess import call
import uuid
import math
import shutil
import getopt
#----------------------------------------------------------------------
def probe_file(filename):
cmnd = ['ffprobe', '-show_format', '-pretty', '-loglevel', 'quiet', filename]
p = subprocess.Popen(cmnd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
#print filename
out, err = p.communicate()
#print out
if err:
print err
return None
return out
#----------------------------------------------------------------------
def time_to_sec(time_raw):
"""
str->int
ignore .*."""
hr = int(time_raw.split(':')[0]) * 3600
minute = int(time_raw.split(':')[1]) * 60
sec = int(float(time_raw.split(':')[2]))
return int(hr + minute + sec)
#----------------------------------------------------------------------
def get_abspath(filename):
""""""
return str(os.path.abspath(filename))
#----------------------------------------------------------------------
def process(filename, target_bitrate, audiobitrate, safe, outputfile):
"""str,int,int,str->?
filename,outputfile comes with the path.
safe=0: directly convert the file to m4a"""
tmpdir = '/tmp/Audioblacker-' + str(uuid.uuid4())
if not os.path.exists(tmpdir):
os.makedirs(tmpdir)
audio_format = ''
audio_duration = ''
audio_bitrate = ''
video_format = ''
video_duration = ''
video_bitrate = ''
ff = ''
#demux audio file
# Add this to save time, for experienced users
print('INFO: Checking audio and remux...')
if safe == 0:
#directly to m4a to save space
os.system('ffmpeg -i \'' + filename + '\' -vn -c:a copy ' + tmpdir+'/audio.m4a' +'> /dev/null 2>&1')
try:
for line in probe_file(tmpdir+'/audio.m4a').split('\n'):
#print(line)
if 'duration' in line:
audio_duration = str(line.split('=')[1])
except:
print('ERROR: Cannot read audio file!')
shutil.rmtree(tmpdir)
exit()
else:
os.system('ffmpeg -i \'' + filename + '\' -vn -c:a copy ' + tmpdir+'/audio.aac' +'> /dev/null 2>&1')
try:
for line in probe_file(tmpdir+'/audio.aac').split('\n'):
if 'format_name' in line:
audio_format = str(line.split('=')[1])
if 'duration' in line:
audio_duration = str(line.split('=')[1])
print('INFO: Converting to m4a and clean cache...')
os.system('ffmpeg -i \'' + filename + '\' -vn -c:a copy ' + tmpdir+'/audio.m4a' +'> /dev/null 2>&1')
try:
os.remove(tmpdir+'/audio.aac')
pass
except:
print('WARNING: Cannot remove the aac file now...')
except:
print('ERROR: Cannot read audio file!')
shutil.rmtree(tmpdir)
exit()
#In case someone screw the audio up
if not 'aac' in audio_format:
print(audio_format)
print('ERROR: You have to use AAC as audio format!')
exit()
#Check original file
try:
for line in probe_file(filename).split('\n'):
if 'duration' in line:
video_duration = str(line.split('=')[1])
break
except:
print('ERROR: Cannot read video file!')
shutil.rmtree(tmpdir)
exit()
#Calc...
#time_by_video
print('INFO: Doing calculation...')
try:
video_duration_sec = time_to_sec(video_duration)
video_size_byte = int(os.path.getsize(filename))
audio_duration_sec = time_to_sec(audio_duration)
audio_size_byte = int(os.path.getsize(tmpdir+'/audio.m4a'))
except:
print('ERROR: Cannot calculate time, did you input a bitrate too high?')
shutil.rmtree(tmpdir)
exit()
#!!!!!FLOAT DUE TO ACCURACY!!!!!
target_byterate = target_bitrate / 8.0
target_audiobyterate = audiobitrate / 8.0
time_video = int(math.ceil((video_size_byte - target_byterate * video_duration_sec) / (target_byterate - 470)))
time_audio = int(math.ceil((audio_size_byte - target_audiobyterate * audio_duration_sec) / (target_audiobyterate - 470)))
if time_audio < 0 and time_video < 0:
print('ERROR: Cannot calculate target, your target bitrate is higher than the original file!')
shutil.rmtree(tmpdir)
exit()
if time_audio == 0 and time_video == 0:
time_patch = 60
elif time_audio > time_video:
time_patch = time_audio + 10
else:
time_patch = time_video + 10
#Make audio patch
print('INFO: Making ' + str(time_patch) + ' secs blank audio...')
os.system('ffmpeg -filter_complex \'aevalsrc=0:d=' + str(time_patch) + '\' -strict experimental -c:a aac ' + tmpdir + '/black.m4a'+'> /dev/null 2>&1')
f = open(tmpdir + '/audiocode.txt', 'w')
ff = 'file \'' + tmpdir + '/audio.m4a\'' + '\n' + 'file \'' + tmpdir + '/black.m4a\''
py_path = sys.path[0]
os.chdir(py_path)
f.write(ff)
f.close()
print('INFO: Concating audios...')
os.system('ffmpeg -f concat -i '+ tmpdir + '/audiocode.txt -c copy '+ tmpdir +'/audiopatched.m4a'+'> /dev/null 2>&1')
print('INFO: Making final output file...')
os.system('ffmpeg -i ' + filename + ' -i ' + tmpdir +'/audiopatched.m4a -c copy -map 0:0 -map 1:0 '+outputfile +'> /dev/null 2>&1')
print('Done!')
#clean up
try:
shutil.rmtree(tmpdir)
except:
print('ERROR: Cannot remove temp dir, do it by yourself!')
#----------------------------------------------------------------------
def usage():
""""""
print('''Usage:
python audioblacker.py (-h) (-i input.mp4) (-o output.mp4) (-b 1900000) (-a 110000) (-s 1)
-h: Default: None
Help.
-i: Default: Blank
Input file.
If the file and audioblacker are not under the same path,
it is suggested to use absolute path to avoid possible failure.
-o Default: input-filename.black.mp4
Output file.
Would be in the same folder with the original file if not specified.
-b: Default: 1900000
Target bitrate.
-a: Default: 110000
Target audio bitrate.
audioblacker would calculate both of the required black time,
and choose the larger one to make sure your convert is successful.
Please notice that if your original video/audio bitrate is too small,
audioblacker would throw you an ERROR and quit.
-s: Default: 1
Use safe mode.
audioblacker would check whether the file's audio is AAC.
Disabling would save you some space and time,
if you know what you are doing.
''')
#----------------------------------------------------------------------
if __name__=='__main__':
argv_list = []
argv_list = sys.argv[1:]
filename = ''
target_bitrate = 1900000
outputfile = ''
safe = 1
audiobitrate = 110000
try:
opts, args = getopt.getopt(argv_list, "hi:b:a:o:s:", ['help', 'input','bitrate', 'audiobitrate'
'outputfile', 'safe'])
except getopt.GetoptError:
usage()
exit()
for o, a in opts:
if o in ('-h', '--help'):
usage()
exit()
elif o in ('-i', '--input'):
filename = a
try:
argv_list.remove('-i')
except:
break
elif o in ('-b', '--bitrate'):
target_bitrate = int(a)
try:
argv_list.remove('-b')
except:
break
elif o in ('-a', '--audiobitrate'):
audiobitrate = int(a)
try:
argv_list.remove('-a')
except:
break
elif o in ('-o', '--outputfile'):
outputfile = a
try:
argv_list.remove('-o')
except:
break
elif o in ('-s', '--safe'):
safe = int(a)
try:
argv_list.remove('-s')
except:
break
if filename == '':
print('ERROR: No input file!')
exit()
if outputfile == '':
outputfile = filename.split('.')[0]
for i in filename.split('.')[1:-1]:
outputfile = outputfile + '.' + i
outputfile = outputfile + '.black.mp4'
process(filename, target_bitrate, audiobitrate, safe, outputfile)
exit()