convert.py

''' Converts audio file into flac file.

The function "convert_audio_type" changes into the directory where the file is
stored. After finding the file, it uses ffmpeg to convert the file into a new
audio format such as flac. To use another audio format instead of "flac"
simply change the variable "new_audio_type".

IMPORTANT:
1) This file uses ffmpeg installed locally from: https://ffmpeg.org/download.html
2) You must add ffmpeg to your PATH, for example:
   export PATH=$PATH:/<...path to ffmpeg...>/ffmpeg/bin
3) On Windows, the executable is named "ffmpeg.exe", if on MAC or Linux you
   may have to change the variable "ffmpeg_name".
'''

from glob import glob
from os import chdir, path
from subprocess import Popen
from time import sleep

def convert_audio_type(f_out, directory, output_file):
    '''
    Description: Converts all the downloaded webm files into a flac files.
    Params:
        (f_out): File object, referring to the file with the list of
                failed Youtube URLs.
        (directory): Where to get the downloaded webm files from.
        (output_file): Text file listing failed URLs.
    '''
    chdir(directory)

    ffmpeg_name = 'ffmpeg.exe'
    all_files = glob("*")
    all_files.sort(key=path.getmtime) # sorts the files by date
    new_audio_type = "flac"
    for file in all_files:
        new_file = file.split(".")[0] + "." + new_audio_type
        cmds = [ffmpeg_name, '-i', file, new_file]
        # try-except doesn't work, since ffmpeg doesn't produce error with invalid file name
        try:
            p = Popen(cmds)
            sleep(5)
            p.kill()
            print(f"\033[1;32;49m Converted {file} to {new_file}") # green
            sleep(0.5)
            print()
        except:
            f_out.write(file + '\n')
            f_out.close()
            f_out = open(output_file, 'a')
            print(f"\033[1;31;49m Failed_Convert: {file} to {new_file}") # red

    chdir('..')