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package com.repast.core.tool;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import org.bytedeco.javacpp.opencv_core;
import org.bytedeco.javacpp.opencv_core.IplImage;
import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.Frame;
import org.bytedeco.javacv.FrameGrabber.Exception;
import org.bytedeco.javacv.Java2DFrameConverter;
import org.bytedeco.javacv.OpenCVFrameConverter;
/**
* javacv
* @author 周海峰
*
*/
public class FrameGrabberKit {
public static void main(String[] args) throws Exception {
System.out.println(System.getProperty("java.library.path"));
try {
fetchFrame("D:/video/aa.mp4", "D:/new/aa.jpg");
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 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
* @throws IOException
*/
public static void fetchFrame(String videofile, String framefile)
throws Exception, IOException {
FFmpegFrameGrabber ff = new FFmpegFrameGrabber(videofile);
ff.start();
ff.getAudioChannels();
String rotate =ff.getVideoMetadata("rotate");//视频的旋转角度
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;
}
IplImage src = null;
if(null !=rotate &&rotate.length() > 1) {
OpenCVFrameConverter.ToIplImage converter =new OpenCVFrameConverter.ToIplImage();
src =converter.convert(f);
f =converter.convert(rotate(src, Integer.valueOf(rotate)));
}
doExecuteFrame(f, framefile);
i++;
}
}
public static IplImage rotate(IplImage src,int angle) {
IplImage img = IplImage.create(src.height(),src.width(),src.depth(),src.nChannels());
opencv_core.cvTranspose(src,img);
opencv_core.cvFlip(img,img,angle);
return img;
}
public static void doExecuteFrame(Frame f,String targetFileName) {
if (null ==f ||null ==f.image) {
return;
}
Java2DFrameConverter converter =new Java2DFrameConverter();
BufferedImage bi =converter.getBufferedImage(f);
File output =new File(targetFileName);
try {
ImageIO.write(bi,"jpg",output);
}catch (IOException e) {
e.printStackTrace();
}
}
}
<dependency>
<groupId>org.bytedeco</groupId>
<artifactId>javacv-platform</artifactId>
<version>1.3.1</version>
</dependency>
