How to run a external process on a PyQt5 OSX app, without crashing the app?

Question

I'm currently building an app that uses OCR to extract data from PDF files using PYQT5, and I need to use the terminal to convert the pdf into jpeg's before running the OCR; however, when I run this subprocess after compiling it crashes, but it works perfectly if I don't compile the program.

It seems to me that the problem lies within the subprocess call. I've tried many different ways, but I don't know why my app keeps crashing after I compile and run the conversion.

NOTE: For PDF to JPEG I'm using ImageMagick

Currently using to compile:

py2applet --make-setup main.py
python3 setup.py py2app

Converter.py:

from subprocess import call
from PIL import Image
import pytesseract 
from PyQt5 import QtWidgets
from ocrgui import Ui_MainWindow

class ImageConverter(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self):
        super().__init__()
        self.setupUi(self)
        self.show()
        self.sbmt_btn_convert.clicked.connect(self.convert_image)

    def convert_image(self): #Converts image into jpeg
        text = str(self.input_convert.text())
        output = str(self.output_convert.text())

        convert = 'converted.jpeg'
        call('convert -density 300 ' + text + ' ' + convert, shell=True)

        im = Image.open(convert)
        text = pytesseract.image_to_string(im, lang = 'eng')
        file = open(output,'w')
        file.write(text)
        file.close()

        call('rm converted.jpeg', shell=True)
        print('Succesfully created')

Main.py:

import sys
from PyQt5.QtWidgets import QApplication
from calculator import CalculatorWindow

app = QApplication(sys.argv)

calculator = CalculatorWindow()

sys.exit(app.exec()) 

Answer 1

I think that problem in the next module:

pathPython\Lib\site-packages\PIL\ImageQt.py

Try to put # on the next lines:

...
try:
    from PyQt5.QtGui import QImage, qRgba, QPixmap
    from PyQt5.QtCore import QBuffer, QIODevice
    qt_version = '5'
except (ImportError, RuntimeError):
    print("except (ImportError, RuntimeError):!!!!!!!!!!!!")
    #try:
    #    from PyQt4.QtGui import QImage, qRgba, QPixmap
    #    from PyQt4.QtCore import QBuffer, QIODevice
    #    qt_version = '4'
    #except (ImportError, RuntimeError):
    #    try:
    #        from PySide.QtGui import QImage, qRgba, QPixmap
    #        from PySide.QtCore import QBuffer, QIODevice
    #        qt_version = 'side'
    #    except ImportError:
    #        qt_is_installed = False
...