Need help to crop border from a bunch of GIFs (lemmy.world)

submitted 1 year ago* (last edited 1 year ago) by Shady_Shiroe@lemmy.world to c/python@programming.dev

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I am assisting in making a wiki for an old game, and we ripped the avatar GIFs from the games shop and want to have a catalog of them. What I need to do is to crop all the borders which are identical from 3,170 GIFs and maybe make background transparent.

I haven't used python in years, but I managed to cobble up something that almost works as a single image test, only issue is that it crops and outputs only the first frame:

from PIL import Image

if __name__ == "__main__":
    input_loc = "AvatarShopImages/80001.gif"
    output_loc = "Output/80001.gif"
    im = Image.open(input_loc)
    im = im.crop((4, 4, 94, 94))
    im.save(output_loc)

If it looks weird, it is because I copy/pasted some code and edited a lot out of it.

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[-] UlrikHD@programming.dev 1 points 1 year ago* (last edited 1 year ago)

As others have suggested, ffmpeg is a great cli tool. If you aren't comfortable with the terminal you can do it via python like this:

import os
import sys
import subprocess


def crop_media(file_name: str, w: int, h: int, x: int, y: int, new_dir: str) -> None:
    try:
        subprocess.run(f'ffmpeg -i "{file_name}" -vf "crop={w}:{h}:{x}:{y}" temp.gif -y',
                           shell=True, check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
        os.rename('temp.gif', os.path.join(new_dir, file_name))
    # Print the error and continue with other gifs, remove try block if you want a complete stop
    except subprocess.CalledProcessError as e:
        print(e)
    except KeyboardInterrupt:
        print('KeyboardInterrupt, cleaning up files...')
        os.remove('temp.gif')
        sys.exit(0)


def crop_directory(directory: str, w: int, h: int, x: int, y: int, new_dir: str) -> None:
    for root, _, files in directory:
        for file in files:
            if not file.endswith('.gif'):
                continue
            if os.path.isfile(os.path.join(new_dir, file)):
                print(f'{file} already exists in {new_dir}, skipping...')
                continue

            file_path = os.path.normpath(os.path.join(root, file))
            crop_media(file_path, w, h, x, y, new_dir)


if __name__ == '__main__':
    width = 0
    height = 0
    x_offset = 0
    y_offset = 0
    gif_directory = ''
    new_directory = ''
    crop_directory(gif_directory, width, height, x_offset, y_offset, new_directory)

This should go through every file in the directory and subdirectories and call the ffmpeg command on each .gif. With new_directory you can set a directory to store every cropped .gif. The ffmpeg command is based on johnpiers suggestion.

The script assumes unique filenames for each gif and should work with spaces in the filenames. If they aren't unique, you can just remove the new_directory part, but you will then lose the original gif that you cropped.