Replace progressive JPEGs in album art with non-progressive JPEGs, recursively

deprog.py

import eyed3
import io
import os
from PIL import Image

def is_progressive(img):
    return "progression" in img.info or "progressive" in img.info
        

def deprogressify(filename):
    f = eyed3.load(filename)

    if f is None:
        return
    
    if f.tag is None:
        f.initTag()

    cover = f.tag.images[0]

    img = Image.open(io.BytesIO(cover.image_data))
    if not is_progressive(img):
        return

    adjusted = io.BytesIO()
    img.save(adjusted, "JPEG", progressive=False)
    adjusted.seek(0)

    existing_images = [x.description for x in f.tag.images]
    for e in existing_images:
        f.tag.images.remove(e)
        
    f.tag.images.set(3, adjusted.read(), "image/jpeg")
    f.tag.save()

for root, dirs, files in os.walk("C:/Users/cadel/Music/beets"):
    for file in files:
        deprogressify(os.path.join(root, file))