java 视频处理 帧数截取图片处理代码

1. 添加依赖

        <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>javacv-platform</artifactId>
            <version>1.4.4</version>
        </dependency>

2. 核心代码

• 获取视频时长

    /**
     * 获取视频时长，单位为秒
     *
     * @param video 源视频文件
     * @return 时长（s）
     */
    public static long getVideoDuration(File video) {
        long duration = 0L;
        FFmpegFrameGrabber ff = new FFmpegFrameGrabber(video);
        try {
            ff.start();
            duration = ff.getLengthInTime() / (1000 * 1000);
            ff.stop();
        } catch (FrameGrabber.Exception e) {
            e.printStackTrace();
        }
        return duration;
    }

• 截取视频指定帧为图片

    /**
     * 截取视频获得指定帧的图片
     *
     * @param video   源视频文件
     * @param picPath 截图存放路径
     */
    public static void getVideoPic(File video, String picPath) {
        FFmpegFrameGrabber ff = new FFmpegFrameGrabber(video);
        try {
            ff.start();

            // 截取中间帧图片(具体依实际情况而定)
            int i = 0;
            int length = ff.getLengthInFrames();
            int middleFrame = length / 2;
            Frame frame = null;
            while (i < length) {
                frame = ff.grabFrame();
                if ((i > middleFrame) && (frame.image != null)) {
                    break;
                }
                i++;
            }

            // 截取的帧图片
            Java2DFrameConverter converter = new Java2DFrameConverter();
            BufferedImage srcImage = converter.getBufferedImage(frame);
            int srcImageWidth = srcImage.getWidth();
            int srcImageHeight = srcImage.getHeight();

            // 对截图进行等比例缩放(缩略图)
            int width = 480;
            int height = (int) (((double) width / srcImageWidth) * srcImageHeight);
            BufferedImage thumbnailImage = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
            thumbnailImage.getGraphics().drawImage(srcImage.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0, 0, null);

            File picFile = new File(picPath);
            ImageIO.write(thumbnailImage, "jpg", picFile);

            ff.stop();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

3. 测试用例

    public static void main(String[] args) {
        String videoPath = ResourceUtils.CLASSPATH_URL_PREFIX + "video.mp4";
        File video = null;
        try {
            video = ResourceUtils.getFile(videoPath);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        String picPath = "video.jpg";
        getVideoPic(video, picPath);

        long duration = getVideoDuration(video);
        System.out.println("videoDuration = " + duration);
    }