import sys
from PIL import Image

from PIL import Image, ImageSequence

def extract_odd_frames(input_gif, output_gif):
    # 打开原始 GIF
    with Image.open(input_gif) as im:
        frames = []
        durations = []

        # 遍历所有帧
        for i, frame in enumerate(ImageSequence.Iterator(im)):
            if i % 2 == 0:  # 保留单数帧（注意：i 从 0 开始，0 实际上是第一帧）
                frame_copy = frame.copy()
    ...