Convert GIF files to WEBP

convert_gifs_to_webp.py

# convert gifs to webp files with quality 70 and 1 frame skip.
# ~85% size reduction

import os
from PIL import Image, ImageSequence

def get_files(directory='.', extensions=None):
    found = []
    
    for root, dirs, files in os.walk(directory):
        for file in files:
            if file.endswith(extensions):
                found.append(os.path.join(root, file))
    
    total_size = sum(os.path.getsize(gif) for gif in found)
    file_count = len(found)

    print(f"Total {extensions} files: {file_count}")
    print(f"Total size: {total_size / (1024*1024):.2f} MB")

    return found

def gif_to_webp(files, quality=70):
  
  for file in files:
    input_gif_path = file
    output_webp_path = file.replace('.gif', '.webp')

    with Image.open(input_gif_path) as gif:
      frames = [frame.convert('RGB') for index, frame in enumerate(ImageSequence.Iterator(gif)) if index % 2 == 0]
      duration = gif.info.get('duration', 100) * 2

      frames[0].save(
          output_webp_path, 
          format='WEBP', 
          save_all=True, 
          append_images=frames[1:], 
          loop=gif.info.get('loop', 0),
          quality=quality,
          duration=duration
      )

    print(f"Converted {input_gif_path} to {output_webp_path}.")

def delete_files(files):
    for file in files:
        os.remove(file)
        print(f"Deleted {file}.")

if __name__ == "__main__":
    files = get_files("./", '.gif')
    gif_to_webp(files)
    get_files("./", '.webp')
    delete_files(files)