What's wrong with Windows Task Sheduler + pytesseract + multiprocessing? - windows

Question

Have the python code with pytesseract & multiprocessing. When I start the code manually from PyCharm it works fine with any number of threads. When I start the code with Win Task Sheduler with 'threads=1' it works fine.
However if I start the code with Win Task Sheduler with 'threads=2' or more than 2, it finishes without processing the images and without any errors.
I've got log messages like this. Script starts but does nothing and there is no any errors in Win logs
2020-05-24 13:09:31,834;START
2020-05-24 13:09:31,834;threads: 2
2020-05-24 13:10:31,832;START
2020-05-24 13:10:31,832;threads: 2
2020-05-24 13:11:31,851;START
2020-05-24 13:11:31,851;threads: 2
Code
from PIL import Image
import pytesseract
from pytesseract import Output
import datetime
from glob import glob
import os
import multiprocessing as multiprocessing
import cv2
import logging
def loggerinit(name, filename, overwrite):
logger = logging.getLogger(name)
logger.setLevel(logging.INFO)
# create the logging file handler
fh = logging.FileHandler(filename, encoding = 'UTF-8')
formatter = logging.Formatter('%(asctime)s;%(message)s')
fh.setFormatter(formatter)
# add handler to logger object
logger.addHandler(fh)
return logger
def getfiles(dirname, mask):
return glob(os.path.join(dirname, mask))
def tess_file(fname):
img = cv2.imread(fname)
img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
im_for_T = Image.fromarray(img)
pytesseract.pytesseract.tesseract_cmd = 'C://Tesseract-OCR//tesseract.exe'
TESSDATA_PREFIX = 'C:/Program Files/Tesseract-OCR/tessdata'
try:
os.environ['OMP_THREAD_LIMIT'] = '1'
tess_data = pytesseract.image_to_osd(im_for_T, output_type=Output.DICT)
return fname, tess_data
except:
return fname, None
if __name__ == '__main__':
logger = loggerinit('tess', 'tess.log', False)
files = getfiles('Croped', '*.jpg')
t1 = datetime.datetime.now()
logger.info('START')
threads = 2
logger.info('threads: ' + str(threads))
p = multiprocessing.Pool(threads)
results = p.map(tess_file,files)
e = []
for r in results:
if type(r) == type(None):
e.append('OCR error: ' + r)
else:
print(r[0],". rotate: ",r[1]['rotate'])
p.close()
p.join()
t2 = datetime.datetime.now()
delta = (t2 - t1).total_seconds()
print('Total time: ', delta)
print('Files: ', len(files))
logger.info('Files: ' + str(len(files)))
logger.info('Stop.' + 'Total time: ' + str(delta))
# Print error if exist
for ee in e:
print(ee)
Whats wrong? How can I fix this issue?