Java 获取视频时长及截取帧截图

前言

只是最近碰到有这方面的项目需求，所以简单 Mark 下本文。下面的示例是参考过他人分享的文章，之后本人再自行实践、调整和测试过的，希望对有这方面需求的人有所帮助。

示例

1. 添加依赖

        
            org.bytedeco
            javacv-platform
            1.4.4
        

上述这段 maven 依赖包含了完整的 javacv 功能 (非常多，依赖Jar就占大概有500MB)，由于这里只使用到了其中 ffmpeg 这块的特性，因此也可以像下面这样排除掉无关的部分

        
            org.bytedeco
            javacv
            1.4.4
            
                
                    org.bytedeco
                    javacpp
                
                
                    org.bytedeco.javacpp-presets
                    flycapture
                
                
                    org.bytedeco.javacpp-presets
                    libdc1394
                
                
                    org.bytedeco.javacpp-presets
                    libfreenect
                
                
                    org.bytedeco.javacpp-presets
                    libfreenect2
                
                
                    org.bytedeco.javacpp-presets
                    librealsense
                
                
                    org.bytedeco.javacpp-presets
                    videoinput
                
                
                    org.bytedeco.javacpp-presets
                    opencv
                
                
                    org.bytedeco.javacpp-presets
                    tesseract
                
                
                    org.bytedeco.javacpp-presets
                    leptonica
                
                
                    org.bytedeco.javacpp-presets
                    flandmark
                
                
                    org.bytedeco.javacpp-presets
                    artoolkitplus
                
            
        
        
            org.bytedeco
            javacv-platform
            1.4.4
            
                
                    org.bytedeco
                    javacv
                
                
                    org.bytedeco.javacpp-presets
                    flycapture-platform
                
                
                    org.bytedeco.javacpp-presets
                    libdc1394-platform
                
                
                    org.bytedeco.javacpp-presets
                    libfreenect-platform
                
                
                    org.bytedeco.javacpp-presets
                    libfreenect2-platform
                
                
                    org.bytedeco.javacpp-presets
                    librealsense-platform
                
                
                    org.bytedeco.javacpp-presets
                    videoinput-platform
                
                
                    org.bytedeco.javacpp-presets
                    opencv-platform
                
                
                    org.bytedeco.javacpp-presets
                    tesseract-platform
                
                
                    org.bytedeco.javacpp-presets
                    leptonica-platform
                
                
                    org.bytedeco.javacpp-presets
                    flandmark-platform
                
                
                    org.bytedeco.javacpp-presets
                    artoolkitplus-platform
                
            
        

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);
    }

文章已授权转载，原文链接：Java 获取视频时长及截取帧截图