Java截取视频文件缩略图

/**
 * 截取视频第0帧的图片
 */
public static void videoImage(String filePath, String fileName,int widthdist, int heightdist) throws FrameGrabber.Exception {
    File targetDir = new File(filePath + FS_FILE_APP_PATH);
    if (!targetDir.exists()) {
        targetDir.mkdirs();
    }
    FFmpegFrameGrabber ff = FFmpegFrameGrabber.createDefault(filePath + fileName);

    ff.start();
    int ffLength = ff.getLengthInFrames();
    org.bytedeco.javacv.Frame f;
    int i = 0;
    while (i < ffLength) {
        f = ff.grabImage();
        //截取第0帧
        if(i==0){
            //执行截图并放入指定位置
            doExecuteFrame(f, filePath + FS_FILE_APP_PATH + fileName.substring(0,fileName.lastIndexOf(".")) + ".jpg",widthdist,heightdist);
            break;
        }
        i++;
    }
    ff.stop();

}
/**
 * 截取缩略图
 */
private static void doExecuteFrame(org.bytedeco.javacv.Frame f, String targerFilePath,int widthdist, int heightdist) {
    String imagemat = "jpg";
    if (null == f ) {
        return;
    }
    Java2DFrameConverter converter = new Java2DFrameConverter();
    BufferedImage bi = converter.getBufferedImage(f);
    try {
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        ImageIO.write(bi, imagemat, os);
        InputStream is = new ByteArrayInputStream(os.toByteArray());
        // 开始读取文件并进行压缩
        Image src = ImageIO.read(is);

        // 构造一个类型为预定义图像类型之一的 BufferedImage
        BufferedImage tag = new BufferedImage((int) widthdist, (int) heightdist, BufferedImage.TYPE_INT_RGB);

        //绘制图像  getScaledInstance表示创建此图像的缩放版本，返回一个新的缩放版本Image,按指定的width,height呈现图像
        //Image.SCALE_SMOOTH,选择图像平滑度比缩放速度具有更高优先级的图像缩放算法。
        tag.getGraphics().drawImage(src.getScaledInstance(widthdist, heightdist, Image.SCALE_SMOOTH), 0, 0, null);

        //创建文件输出流
        FileOutputStream out = new FileOutputStream(targerFilePath);
        //将图片按JPEG压缩，保存到out中
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
        encoder.encode(tag);
        //关闭文件输出流
        out.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

//调用

videoImage(bootdoConfig.getUploadPath()+floderPath, fileName,100,100);

//pom文件添加依赖

<!--javacv 精简版本 ffmpeg -->
<dependency>
    <groupId>org.bytedeco</groupId>
    <artifactId>javacv</artifactId>
    <version>1.3.1</version>
    <exclusions>
        <exclusion>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>*</artifactId>
        </exclusion>
    </exclusions>
</dependency>

<dependency>
    <groupId>org.bytedeco.javacpp-presets</groupId>
    <artifactId>ffmpeg</artifactId>
    <version>3.2.1-1.3</version>
</dependency>
<dependency>
    <groupId>org.bytedeco.javacpp-presets</groupId>
    <artifactId>ffmpeg</artifactId>
    <version>3.2.1-1.3</version>
    <classifier>windows-x86_64</classifier>
</dependency>
<dependency>
    <groupId>org.bytedeco.javacpp-presets</groupId>
    <artifactId>ffmpeg</artifactId>
    <version>3.2.1-1.3</version>
    <classifier>linux-x86_64</classifier>
</dependency>