jpger

#!/usr/bin/python3

# Script to convert multiple image files into jpg.
# Edit the first three variables accordingly.
# Dependencies: Python 3, FFmpeg.

import os
import mimetypes
import subprocess

# edit the variables: inputFilename, outputFilename, ffmpegcmd

# common string in the input filename
# that is ALSO NOT in the `outputFilename` below IF POSSIBLE; else remove the files that were generated by this script before running it again when some error happens.
inputFilename = 'img'

# output filename format
outputFilename = 'img{numbering}.jpg'

# copy the mkv cmd, remove --title, and insert {output} & {input} in proper place.
ffmpegcmd = "ffmpeg -v warning -i '{input}' './jpg/{output}'"
os.makedirs("./jpg", exist_ok=True)


def filterVid(file):
    fullPath = os.path.join(os.getcwd(), file)
    guessType = mimetypes.guess_type(fullPath)

    isFile = os.path.isfile(fullPath)
    isNotNoneType = guessType[0] is not None

    isTypeMatched = isNotNoneType and (
        'image' in guessType[0])

    isCorrectInput = inputFilename in file

    if isFile and isTypeMatched and isCorrectInput:
        return True
    else:
        return False


def getNumbering(num):
    return ("00" + str(num)) if (num < 10) else ("0" +
                                                 str(num)) if (num < 100) else str(num)


listdir = os.listdir()
filteredDir = list(filter(filterVid, listdir))
filteredDir.sort()
# increase by 1 when the file is a double page (indicated by a dash "-").
initialNum = 0

for idx, file in enumerate(filteredDir, start=1):
    num = idx - initialNum
    numbering = ""
    if "-" in file:  # if the image file is a double page
        numbering = getNumbering(num) + "-" + getNumbering(num + 1)
        initialNum += 1
    else:
        numbering = getNumbering(num)
    outputFormat = outputFilename.format(numbering=numbering)
    cmdFormat = ffmpegcmd.format(input=file, output=outputFormat)
    print("\n", cmdFormat, "\n")
    # subprocess.run(cmdFormat, text=True, shell=True)