java获取视频第一帧图片

2018-10-10

用的jar包如下（用的版本比较新）：

jar包链接：https://pan.baidu.com/s/1LI68r6H17sAA4Pfbnpm44g

　　

public static void fetchFrame(String videofile, String framefile)
            throws Exception {
        long start = System.currentTimeMillis();
        File targetFile = new File(framefile);
        FFmpegFrameGrabber ff = new FFmpegFrameGrabber(videofile);
        ff.start();
        int lenght = ff.getLengthInFrames();
        int i = 0;
        Frame f = null;
        while (i < lenght) {
            // 过滤前5帧，避免出现全黑的图片，依自己情况而定
            f = ff.grabFrame();
            if ((i > 48) && (f.image != null)) {
                break;
            }
            i++;
        }
//        IplImage img = f.image;
        int owidth = f.imageWidth;
        int oheight = f.imageHeight;
        // 对截取的帧进行等比例缩放
        int width = 300;
        int height = (int) (((double) width / owidth) * oheight);
        Java2DFrameConverter converter = new Java2DFrameConverter();
        BufferedImage fecthedImage = converter.getBufferedImage(f);
        BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
        bi.getGraphics().drawImage(fecthedImage.getScaledInstance(width, height, Image.SCALE_SMOOTH),
                0, 0, null);
        ImageIO.write(bi, "jpg", targetFile);
        ff.stop();
        System.out.println(System.currentTimeMillis() - start);
    }

注：javacv0.8的方法有如下不同：

int owidth = img.width();
int oheight = img.height();