我最喜欢Neil的答案，因为它不会在音频文件之间引入相关性：只需选择一个增益水平并将其调整为所有增益水平即可。
但是我在解析normalize-ogg某些文件的输出时遇到了一些问题。还有一个令人讨厌的问题bc：它不进行真正的舍入，它只会截断。
所以最终我放弃了shell脚本，转而使用python。
注意1： exiftool部分可能过大，但我想100％确保保留原始比特率。
注意2：这将覆盖原始文件，如果要保留原始文件，请在最后一次调用normalize-ogg时使用--backup。但是我发现将副本保存在单独的，更安全的目录中更为实用。
注意3：此解决方案处理ogg文件，但是将其适应mp3并不容易，只需将出现的“ ogg”替换为“ mp3”即可。
这是我对这个问题的看法。最新版本可以在这里找到：regain.py
#!/usr/bin/python3
"""
Parallel normalize gains
"""
'
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'
# Absolute value, in dB for the desired gain of each file
TARGET_GAIN = -12
#
MAX_THREADS = 2
from subprocess import Popen, PIPE
from multiprocessing.dummy import Pool as ThreadPool
from os import listdir
import logging
def initlogger(logfile="log.log", mainlevel=logging.DEBUG,
filelevel=logging.DEBUG, consolelevel=logging.DEBUG):
'''initlogger'''
# create logger
logger = logging.getLogger()
logger.setLevel(mainlevel)
# create file handler which logs even debug messages
fh = logging.FileHandler(logfile)
fh.setLevel(filelevel)
# create console handler also logging at DEBUG level
ch = logging.StreamHandler()
ch.setLevel(consolelevel)
# create formatter and add it to the handlers
formatter = logging.Formatter("%(asctime)s [%(threadName)-12.12s] [%(levelname)-5.5s] %(message)s")
fh.setFormatter(formatter)
ch.setFormatter(formatter)
# add the handlers to the logger
logger.addHandler(fh)
logger.addHandler(ch)
def logcommand(command=[]):
'''logcommand'''
if not isinstance(command, list):
return "", "", -1
logging.info("Command:\n" + " ".join(command) + "\n")
proc = Popen(command, stdin=PIPE, stdout=PIPE, stderr=PIPE)
output, err = proc.communicate()
output = output.decode("utf-8")
err = err.decode("utf-8")
logging.info("Output:\n" + output + "\n")
logging.info("Error:\n" + err + "\n")
logging.info("Return Code:\n" + str(proc.returncode) + "\n")
return output, err, proc.returncode
def regain(target):
'''regain'''
logging.info("============================ Start File ============================")
logging.warning(target["name"])
logging.info("Extracting gain info.\n")
commandgetlevels = ['normalize-ogg', '-n', target["name"]]
output, err, retcode = logcommand(commandgetlevels)
level = output.split()[0]
logging.debug("Level: " + level)
if "dBFS" in level:
level = level.split("dBFS")[0]
level = level.replace(',', '.')
level = int(round(float(level)))
delta = target["gain"] - level
logging.info("Required adjustment: " + str(delta) + "\n")
if delta is 0:
logging.warning(target["name"] + " is already at the correct level")
return 0
logging.info("Extracting average bitrate.\n")
commandgetinfo = ['exiftool', target["name"]]
output, err, retcode = logcommand(commandgetinfo)
bitrate = '0'
for line in output.split('\n'):
if 'Nominal Bitrate' in line:
bitrate = line.split(':')[1].split()[0]
break
logging.info("Average bitrate is: " + str(bitrate) + "\n")
if bitrate is '0':
logging.error("No valid bitrate found, aborting conversion.\n")
exit(-1)
logging.info("Re-normalizing.\n")
commandrenormalize = ['normalize-ogg', '--ogg', '--bitrate', bitrate,
'-g', str(delta) + 'db', target["name"]]
output, err, retcode = logcommand(commandrenormalize)
if retcode is not 0:
log.error("Output:\n" + output)
log.error("err:\n" + err)
exit(retcode)
return retcode
# function to be mapped over
def parallelregain(gain=TARGET_GAIN, threads=MAX_THREADS):
'''parallelregain'''
logging.info("Creating thread pool with " + str(threads) + " elements.\n")
pool = ThreadPool(threads)
targets = []
files_list = listdir(".")
files_list.sort()
counter = 0
for filename in files_list:
if filename.endswith("ogg"):
target = {
"name":filename,
"gain":gain,
}
targets.append(target)
counter = counter + 1
pool.map(regain, targets)
pool.close()
pool.join()
if __name__ == "__main__":
initlogger(logfile="normalize.log", consolelevel=logging.WARNING)
parallelregain()
