GIF 倒放

复制from PIL import Image, ImageSequence
import io

# 读取 GIF，提取每一帧
with Image.open("input.gif") as img:
    frames = [frame.copy() for frame in ImageSequence.Iterator(img)]

# 反转帧顺序
frames.reverse()

# 保存为倒放 GIF（保留原帧延迟）
# 使用第一帧作为基础，追加其余帧
duration = img.info.get("duration", 100)  # 默认 100ms
frames[0].save(
    "output.gif",
    save_all=True,
    append_images=frames[1:],
    duration=duration,
    loop=0,
    disposal=img.info.get("disposal", 2)
)
print("已生成 output.gif")

复制package main

import (
	"image/gif"
	"os"
)

func main() {
	// 读取原始 GIF
	f, _ := os.Open("input.gif")
	defer f.Close()
	g, _ := gif.DecodeAll(f)

	// 反转帧序列
	for i, j := 0, len(g.Image)-1; i < j; i, j = i+1, j-1 {
		g.Image[i], g.Image[j] = g.Image[j], g.Image[i]
		g.Delay[i], g.Delay[j] = g.Delay[j], g.Delay[i]
	}

	// 写入倒放结果
	out, _ := os.Create("output.gif")
	defer out.Close()
	gif.EncodeAll(out, g)
}

复制const fs = require('fs');
const { GifReader, GifWriter } = require('omggif');

// 读取原始 GIF 文件
const buf = fs.readFileSync('input.gif');
const reader = new GifReader(buf);

// 提取所有帧数据（RGBA 像素）
const frames = [];
for (let i = 0; i < reader.numFrames(); i++) {
    const pixels = new Uint8Array(reader.width * reader.height * 4);
    reader.decodeAndBlitFrameRGBA(i, pixels);
    frames.push({
        pixels,
        delay: reader.frameInfo(i).delay * 10 // omggif 延迟单位是 10ms
    });
}

// 反转帧顺序
frames.reverse();

// 写入倒放 GIF
const writer = new GifWriter(Buffer.alloc(reader.width * reader.height * 4 * frames.length + 1000), reader.width, reader.height, { loop: 0 });
frames.forEach((f, idx) => {
    writer.addFrame(0, 0, reader.width, reader.height, f.pixels, { delay: f.delay / 10 });
});
fs.writeFileSync('output.gif', Buffer.from(writer.buffer.slice(0, writer.end())));
console.log('已生成 output.gif');