MKVree pool issues

### WINDOWS ONLY ATM ###

### IMPORTS ###
import glob
import os
import subprocess
from time import strftime
from multiprocessing import Pool
from colorama import init, Fore, Back, Style

### INITIATION ###
init()
print(Style.BRIGHT)

### WELCOME ###
print(Fore.CYAN + 'Welcome to ' + Fore.BLUE + 'MKVree' + Fore.CYAN + '! :D' + Fore.RESET + '\n')

### FUNCTION ###
def convert(file, mkvmerge_path, mkvmerge_args_raw):#, log):
    if file.count('_fix') == 0:
        print(Fore.WHITE + '> Started work on ' + file + '.')
        mkvmerge_args = mkvmerge_args_raw.replace('{FILE}', file[:-4]) # replace placeholders; cut .mkv from the filename
        convertCMD = mkvmerge_path + ' ' + mkvmerge_args
        subprocess.call(convertCMD)#, stdout=log)
        os.remove(file) # remove old file after successful conversion (NEEDS ERROR CHECKING!!)
        os.rename(file[:-4] + '_fix.mkv', file) # rename converted file to it's original's name
        print(Fore.GREEN + '> Finished work on ' + file + '.')

### MAIN ###
if __name__ == '__main__':
    #log = open(strftime('%d-%m-%Y_%H-%M-%S') + '_MKVree.log', 'w')

    mkvmerge_path     = os.getcwd() + '\\mkvmerge\\mkvmerge.exe'
    mkvmerge_args_raw = '-o "{FILE}_fix.mkv" --engage keep_bitstream_ar_info -A -S --compression -1:none "{FILE}.mkv" -D -S --compression -1:none "{FILE}.mkv" -A -D "{FILE}.mkv"'
    # use {FILE} as placeholder for the filename

    pool = Pool()

    for file in glob.iglob('*.mkv'):
        if file.count('_fix') == 0:
            pool.apply_async(convert, (file, mkvmerge_path, mkvmerge_args_raw))#, log))

    pool.close()
    pool.join()

#log.close()

### HANG ###
while True:
    i = input(Fore.WHITE + '>>> ')
    print(i)