Java基于FFmpeg实现Mp4视频转GIF

<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.yelang</groupId>
    <artifactId>mp42gif</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.bytedeco/javacv-platform -->
        <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>javacv-platform</artifactId>
            <version>1.5.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.madgag/animated-gif-lib -->
        <dependency>
            <groupId>com.madgag</groupId>
            <artifactId>animated-gif-lib</artifactId>
            <version>1.4</version>
        </dependency>
        
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        
        <!-- lombok 代码自动生成组件 add by wuzuhu on 2022-11-01 -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.24</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
</project>

public static void main(String[] args) {
    // 将指定目录的 MP4 文件生成同名的 gif 文件
    File videoDir = new File("E:/testv");
    for (File file : videoDir.listFiles()) {
        String videoPath = file.getPath();
        if (videoPath.endsWith(".mp4")) {
            String gifPath = videoPath.substring(0, videoPath.lastIndexOf(".")) + ".gif";
            try {
                video2Gif(videoPath, gifPath);
                System.out.println("转换完成");
            } catch (Exception e) {
                System.out.println("文件 [" + videoPath + "] 处理异常！");
                e.printStackTrace();
            }
        }
    }
}

private static void video2Gif(String videoPath, String gifPath) throws Exception {
    try (FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(videoPath);
            FileOutputStream targetFile = new FileOutputStream(gifPath)) {
        grabber.start();
        int frames = grabber.getLengthInFrames();
        System.out.println(frames);
        AnimatedGifEncoder encoder = new AnimatedGifEncoder();
        encoder.setFrameRate(frames);
        encoder.start(targetFile);
        Java2DFrameConverter converter = new Java2DFrameConverter();
        for (int i = 0; i < frames; i += 8) {// 8帧合成1帧？（反正越大动图越小、越快）
            encoder.setDelay((int) grabber.getDelayedTime());
            encoder.addFrame(converter.convert(grabber.grabImage()));
            grabber.setFrameNumber(i);
        }
            
        encoder.finish();
    }
}

for (int i = 0; i < frames; i += 8) {// 8帧合成1帧）
    encoder.setDelay((int) grabber.getDelayedTime());
    encoder.addFrame(converter.convert(grabber.grabImage()));
    grabber.setFrameNumber(i);
}