#!/usr/bin/env python3 # ffmpeg wrapper import multiprocessing from os.path import isdir, isfile import ffmpy # argument parsing import argparse # multiprocessing stuff from multiprocessing import Pool from multiprocessing import cpu_count # executing some commands import subprocess # parsing json output of loudnorm import json # file/directory handling import os # most recent starttime for program import time from random import randint """ """ # FIXME # inputfile = ( # '/home/marc/Downloads/FalKKonE - 01 Aria (From "Berserk: The Golden Age Arc").flac' # ) # inputfile = "/home/marc/Downloads/test441.opus" # outputfile = "/home/marc/Downloads/test441_out.opus" # srcfolder = "/home/marc/Downloads/MusikRaw" # destfolder = "/home/marc/Downloads/Musik" musicfile_extensions = (".flac", ".wav", ".mp3", ".m4a", ".aac", ".opus") def get_format(inputfile) -> str: # get codec format # https://stackoverflow.com/a/29610897 # this shows the codecs of all audio streams present in the file, which shouldn't matter unless you have more than one stream ff = ffmpy.FFprobe( inputs={inputfile: None}, global_options=( "-v quiet", "-select_streams a", "-show_entries stream=codec_name", "-of default=noprint_wrappers=1:nokey=1", ), ) # print(ff.cmd) proc = subprocess.Popen(ff.cmd, shell=True, stdout=subprocess.PIPE) # NOTE read output from previous command # rstrip: remove trailing newline # decode: convert from binary string to normal string format: str = ( proc.stdout.read() # pyright: ignore[reportOptionalMemberAccess] .rstrip() .decode("utf8") ) # print(format) return format def remove_picture(inputfile): """ This function makes sure no image is attached to the audio stream. An image might cause problems for the later conversion to opus. Parameters: inputfile (str): Path to file """ tmpfile = os.path.splitext(inputfile)[0] + ".tmp" + os.path.splitext(inputfile)[1] ff = ffmpy.FFmpeg( inputs={inputfile: None}, outputs={tmpfile: "-vn -c:a copy"}, global_options=("-v error"), ) ff.run() os.remove(inputfile) os.rename(tmpfile, inputfile) def loudness_info(inputfile) -> dict[str, str]: # get format from file # inputformat = get_format(inputfile) # NOTE format is actually unnecessary here ff = ffmpy.FFmpeg( inputs={inputfile: None}, outputs={"/dev/null": "-pass 1 -filter:a loudnorm=print_format=json -f null"}, global_options=("-y"), ) # print(ff.cmd) proc = subprocess.Popen( ff.cmd, shell=True, stderr=subprocess.STDOUT, stdout=subprocess.PIPE ) # NOTE get loudness info from subprocess # rstrip: remove trailing newline # decode: convert from binary string to utf8 # splitlines: list of lines (only 12 last ones, length of the output json) # join: reassembles the list of lines and separates with "\n" loudness_json: str = "\n".join( proc.stdout.read().rstrip().decode("utf8").splitlines()[-12:] ) # decode json to dict loudness: dict[str, str] = json.loads(loudness_json) # print(loudness_json) # print(ff.cmd) print("Measuring loudness of ", os.path.basename(inputfile)) return loudness def convert(inputfile, outputfile, loudness): ff = ffmpy.FFmpeg( inputs={inputfile: None}, outputs={ outputfile: "-pass 2" " " "-filter:a" " " "loudnorm=I=-30.0:" "measured_I={input_i}:" "measured_LRA={input_lra}:" "measured_tp={input_tp}:measured_thresh={input_thresh}:" "print_format=json" " " "-c:a libopus" " " "-b:a 320k".format( input_i=loudness["input_i"], input_lra=loudness["input_lra"], input_tp=loudness["input_tp"], input_thresh=loudness["input_thresh"], ) }, global_options=("-y", "-v error"), ) # print(ff.cmd) print("Working on ", os.path.basename(inputfile)) ff.run() def main(inputfile: str): """ Main program loop Parameters: inputfile (str): Path to input file """ # set output folder to parent path + "normalized" outputfolder = os.path.join(os.path.dirname(inputfile), "normalized") # NOTE create output folder # because multiple parallel processes are at work here, # there might be conflicts with one trying to create the directory although it already exists # this while loop makes sure the directory does exist # the try/except block ensures the error is caught and (hopefully) doesn't happen again just after with random sleep # there's very likely a better way to do this, idk while not os.path.isdir(outputfolder): try: os.mkdir(outputfolder) except: time.sleep(randint(0, 4)) # output file path noext_infile: str = os.path.splitext(os.path.basename(inputfile))[0] outputfile: str = os.path.join(outputfolder, noext_infile + ".opus") # print(inputfile) # print(os.path.dirname(inputfile)) # print(os.path.basename(inputfile)) # print(outputfile) remove_picture(inputfile=inputfile) loudness = loudness_info(inputfile=inputfile) convert(inputfile=inputfile, outputfile=outputfile, loudness=loudness) if __name__ == "__main__": parser = argparse.ArgumentParser(description="") # Input directory parser.add_argument( "-i", "--input-dir", required=True, type=str, help="Input source directory" ) # number of cpus/threads to use, defaults to all available parser.add_argument( "-c", "--cpu-count", required=False, type=int, help="Number of cpu cores", default=multiprocessing.cpu_count(), ) # in case you wanted to rerun the conversion for everything parser.add_argument( "-r", "--reset", required=False, action="store_true", help="Rerun conversion for all files", ) args = parser.parse_args() srcfolder = args.input_dir cpu = args.cpu_count reset = args.reset # file where last run timestamp is stored timefile = os.path.join(srcfolder, "run.time") # get time of previous run if reset: timeprev = 0 elif os.path.isfile(timefile): with open(timefile, "r") as file: timeprev = file.read() else: timeprev = 0 # print(timeprev) musicfiles = [] for root, dirs, files in os.walk(srcfolder): # ignore the "normalized" subfolder dirs[:] = [d for d in dirs if d not in ["normalized"]] for file in files: if file.endswith(musicfile_extensions): filepath = os.path.join(root, file) # only file newer than the last run are added if os.path.getmtime(filepath) >= float(timeprev): musicfiles.append(os.path.join(root, file)) # print(musicfiles) with Pool(cpu) as p: p.map(main, musicfiles) # write this run's time into file with open(timefile, "w") as file: file.write(str(time.time()))