small python script to convert png jpgs etc to avif (in parallel hopefully). for me, this reduced filesizes from ~20GB to 7,9GB

aaa.py

#!/usr/bin/env python3

import os
from pathlib import Path
from multiprocessing import Pool, cpu_count
from PIL import Image
import pillow_avif  # noqa: F401
from tqdm import tqdm


SOURCE = Path("/home/sonic/Desktop/alte")
DEST = Path("/home/sonic/Desktop/hallo")

WORKERS = 12  # your CPU cores


def find_images():
    files = []

    for ext in ("*.jpg", "*.jpeg", "*.png", "*.JPG", "*.JPEG", "*.PNG"):
        files.extend(SOURCE.rglob(ext))

    return files


def convert_file(path):
    try:
        relative = path.relative_to(SOURCE)
        output = DEST / relative.with_suffix(".avif")

        output.parent.mkdir(parents=True, exist_ok=True)

        # Skip already converted files
        if output.exists():
            return ("skipped", str(path))

        with Image.open(path) as img:
            img = img.convert("RGB")
            img.save(
                output,
                "AVIF",
                quality=85,
                speed=6
            )

        return ("success", str(path))

    except Exception as e:
        return ("failed", f"{path}: {e}")


def main():
    DEST.mkdir(parents=True, exist_ok=True)

    images = find_images()

    if not images:
        print("No images found.")
        return

    total = len(images)

    print(f"Found {total} images")
    print(f"Using {WORKERS} CPU workers")
    print()

    success = 0
    failed = 0
    skipped = 0

    with Pool(WORKERS) as pool:
        with tqdm(
            total=total,
            desc="Converting",
            unit="img",
            dynamic_ncols=True
        ) as bar:

            for result, info in pool.imap_unordered(convert_file, images):
                if result == "success":
                    success += 1
                elif result == "failed":
                    failed += 1
                    print("\nFAILED:", info)
                elif result == "skipped":
                    skipped += 1

                bar.update(1)

                bar.set_postfix(
                    ok=success,
                    fail=failed,
                    skip=skipped
                )

    print("\n========== Finished ==========")
    print(f"Total:      {total}")
    print(f"Successful: {success}")
    print(f"Failed:     {failed}")
    print(f"Skipped:    {skipped}")
    print(f"Remaining:  {total - success - failed - skipped}")
    print("==============================")



if __name__ == "__main__":
    main()