Any suggestions for improvement?(my first python code)

[PyAlex]

I wrote this code to transfer all the video files from the download folder to the usb.

import threading
from threading import Thread
import os, shutil, time

#patch from https://stackoverflow.com/questions/21799210/python-copy-larger-file-too-slow
def _copyfileobj_patched(fsrc, fdst, length=16*1024*1024):
    """Patches shutil method to hugely improve copy speed"""
    while 1:
        buf = fsrc.read(length)
        if not buf:
            break
        fdst.write(buf)
shutil.copyfileobj = _copyfileobj_patched
#patch from https://stackoverflow.com/questions/21799210/python-copy-larger-file-too-slow

download = "C:\\Users\\AC Milan\\Downloads\\"
USB = "G:\\"
video_format = (".3gp",".asf",".avi",".divx",".flv",".swf",".mp4",".mpeg",".mpg",".ogm",".wmv",".mov",".mkv",".nbr",".rm",".vob",".sfd",".webm",".xvid")
current_file = ""
current_file_size = 0

def move_file():
    global current_file
    global current_file_size
    os.chdir(download)
    for dirs, s_dirs, files in os.walk(download):
        for file in files:
            for v_format in video_format:
                if v_format in file:
                    os.chdir(str(dirs))
                    current_file = file
                    current_file_size = os.stat(file).st_size
                    shutil.copy(file,USB)
                    current_file = ""
                    print(f"►File [[ {file} ]] transfered                                                            ")
    print("All files transfered")
                    
def get_file_size(folder):
    os.chdir(folder)
    file_size = 0
    for dirs, s_dirs, files in os.walk(folder):
        for file in files:
            for v_format in video_format:
                if v_format in file:
                    os.chdir(str(dirs))
                    file_size += os.stat(file).st_size
    return file_size

    
def perc():
    file_size = get_file_size(download)
    moved_size = get_file_size(USB)
    return int(moved_size/file_size*100)

def print_perc():
    while True:
        perce = perc()
        current_transfered_size = os.stat(f"{str(USB)}{current_file}").st_size
        current_perc = int(current_transfered_size/current_file_size*100)
        print(f"|{'▒'*int(perce/2)}{' '*(50-int(perce/2))}| {perce}%    {current_file[:20]} {current_perc}%",end="\r")
        time.sleep(0.1)
        
if __name__ == '__main__':
    Thread(target = move_file).start()
    Thread(target = print_perc).start()