Java 获取视频第一帧

在网上查找相关资料，解答最多的两种解决方法

第一种：ffmpeg工具（安装客户端软件）

第二种：javacv开源工具

 

本文笔记针对第二种"javacv开源工具"的实现

maven

<dependency>
    <groupId>org.bytedeco</groupId>
    <artifactId>javacv</artifactId>
    <version>0.8</version>
</dependency>

代码

/**
	 * 获取指定视频的帧并保存为图片至指定目录
	 * 
	 * @param videofile 源视频文件路径
	 * @param framefile 截取帧的图片存放路径
	 * @throws Exception
	 */
	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 > 5) && (f.image != null)) {
				break;
			}
			i++;
		}
		IplImage img = f.image;
		int owidth = img.width();
		int oheight = img.height();
		// 对截取的帧进行等比例缩放
		int width = 800;
		int height = (int) (((double) width / owidth) * oheight);
		BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
		bi.getGraphics().drawImage(f.image.getBufferedImage().getScaledInstance(width, height, Image.SCALE_SMOOTH), 0,
				0, null);
		ImageIO.write(bi, "jpg", targetFile);
		// ff.flush();
		ff.stop();
		System.out.println(System.currentTimeMillis() - start);
	}

	public static void main(String[] args) {
		try {
			VideoTest.fetchFrame("http://wxsnsdy.tc.qq.com/105/20210/snsdyvideodownload?filekey=30280201010421301f0201690402534804102ca905ce620b1241b726bc41dcff44e00204012882540400&bizid=1023&hy=SH&fileparam=302c020101042530230204136ffd93020457e3c4ff02024ef202031e8d7f02030f42400204045a320a0201000400}",
					"D:/videoImg.jpg");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}