Script to recursively sync all the subtitles of a folder and overwrite the old one (after backing it up). It won't try to sync previously synced subs on next iterations

recursiveSubSync.py

import fnmatch
import os
import subprocess

SUBSYNC_PATH = 'subsync'
VIDEO_EXTENSIONS = ['.mkv', '.mp4', '.avi']
SUBTITLE_EXTENSION_TO_SYNC = '.es.srt'
TEMP_OUTPUT_NAME = 'output.srt'
OLD_SUFFIX = '.old'
FAILED_SUFFIX = '.failed'

matches = []
for root, dirnames, filenames in os.walk('.'):
    for filename in fnmatch.filter(filenames, '*' + SUBTITLE_EXTENSION_TO_SYNC):
        videoMatch = None
        basename = os.path.join(filename.split(SUBTITLE_EXTENSION_TO_SYNC)[0])
        subtitleWithPath = os.path.join(root, filename)
        fileBaseNameWithPath = os.path.join(
            root, filename.split(SUBTITLE_EXTENSION_TO_SYNC)[0])
        for extension in VIDEO_EXTENSIONS:
            videoFileToCheck = f"{fileBaseNameWithPath}{extension}"
            if os.path.exists(videoFileToCheck):
                videoMatch = videoFileToCheck
                break
        if videoMatch is not None:
            if os.path.exists(f"{subtitleWithPath}{OLD_SUFFIX}"):
                print("Sub already synced")
            elif os.path.exists(f"{subtitleWithPath}{FAILED_SUFFIX}"):
                print("This video failed previously, won't try again")
            else:
                try:
                    print(f"Starting sync process of: {filename}")
                    outputFilenameWithPath = os.path.join(
                        root, TEMP_OUTPUT_NAME, )
                    failedFilePath = f"{subtitleWithPath}{FAILED_SUFFIX}"
                    with open(failedFilePath, "w+") as outfile:
                        outCode = subprocess.call(
                            [SUBSYNC_PATH, videoMatch, "-i", subtitleWithPath, "-o", outputFilenameWithPath],
                            stderr=outfile)
                    if outCode != 0:
                        raise Exception
                    os.rename(subtitleWithPath, f"{subtitleWithPath}{OLD_SUFFIX}")
                    os.rename(outputFilenameWithPath, subtitleWithPath)
                    os.remove(f"{subtitleWithPath}{FAILED_SUFFIX}")
                except Exception as e:
                    print(f"There has been an error in the syncing process of: ${filename}")
        else:
            print(f"There's no video file for: {filename}")