javacv 提取视频封面
1引入maven依赖
网上大多引入的是
<!-- https://mvnrepository.com/artifact/org.bytedeco/javacv-platform -->
<dependency>
<groupId>org.bytedeco</groupId>
<artifactId>javacv-platform</artifactId>
<version>1.5.2</version>
</dependency>
此依赖会下载所有jar 包括了android,linux，macosx、windows等平台，大概有400多M，所以需要对依赖进行精简
<dependency> <groupId>org.bytedeco</groupId> <artifactId>javacv</artifactId> <version>1.4.2</version> <exclusions> <exclusion> <groupId>org.bytedeco.javacpp-presets</groupId> <artifactId>*</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.bytedeco.javacpp-presets</groupId> <artifactId>opencv</artifactId> <version>3.4.2-1.4.2</version> </dependency> <dependency> <groupId>org.bytedeco.javacpp-presets</groupId> <artifactId>opencv</artifactId> <version>3.4.2-1.4.2</version> <!-- <classifier>windows-x86_64</classifier>--> <classifier>linux-x86_64</classifier> </dependency> <!-- https://mvnrepository.com/artifact/org.bytedeco.javacpp-presets/ffmpeg --> <dependency> <groupId>org.bytedeco.javacpp-presets</groupId> <artifactId>ffmpeg</artifactId> <version>4.0.1-1.4.2</version> </dependency> <dependency> <groupId>org.bytedeco.javacpp-presets</groupId> <artifactId>ffmpeg</artifactId> <version>4.0.1-1.4.2</version> <!--<classifier>windows-x86_64</classifier>--> <classifier>linux-x86_64</classifier> </dependency>
classifier 根据当前系统进行配置，windows 可使用 windows-x86_64。linux可根据实际情况选择
其他平台需要用可以在classifier里面修改成对应的
<javacpp.platform.android-arm>android-arm</javacpp.platform.android-arm>
<javacpp.platform.android-arm64>android-arm64</javacpp.platform.android-arm64>
<javacpp.platform.android-x86>android-x86</javacpp.platform.android-x86>
<javacpp.platform.android-x86_64>android-x86_64</javacpp.platform.android-x86_64>
<javacpp.platform.ios-arm>ios-arm</javacpp.platform.ios-arm>
<javacpp.platform.ios-arm64>ios-arm64</javacpp.platform.ios-arm64>
<javacpp.platform.ios-x86>ios-x86</javacpp.platform.ios-x86>
<javacpp.platform.ios-x86_64>ios-x86_64</javacpp.platform.ios-x86_64>
<javacpp.platform.linux-armhf>linux-armhf</javacpp.platform.linux-armhf>
<javacpp.platform.linux-arm64>linux-arm64</javacpp.platform.linux-arm64>
<javacpp.platform.linux-ppc64le>linux-ppc64le</javacpp.platform.linux-ppc64le>
<javacpp.platform.linux-x86>linux-x86</javacpp.platform.linux-x86>
<javacpp.platform.linux-x86_64>linux-x86_64</javacpp.platform.linux-x86_64>
<javacpp.platform.macosx-x86_64>macosx-x86_64</javacpp.platform.macosx-x86_64>
<javacpp.platform.windows-x86>windows-x86</javacpp.platform.windows-x86>
<javacpp.platform.windows-x86_64>windows-x86_64</javacpp.platform.windows-x86_64>
Linux查看内核判断命令 : arch
2、java 实现代码
package com.util;
import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.Frame;
import org.bytedeco.javacv.Java2DFrameConverter;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.HashMap;
import java.util.Map;
/**
* 视频处理工具类
* @author admin
*/
public class VideoUtil {
/**
* 获取视频封面图
* @param filePath 视频地址
* @param mod 开始帧数
* @return map
* @throws Exception
*/
public static Map<String, Object> getScreenshot(String filePath,int mod) throws Exception{
filePath = filePath.replaceAll("\\\\","/");
System.out.println("截取视频截图开始："+ System.currentTimeMillis());
Map<String, Object> result = new HashMap<>();
FFmpegFrameGrabber grabber = FFmpegFrameGrabber.createDefault(filePath);
// 第一帧图片存储位置
String targerFilePath = filePath.substring(0, filePath.lastIndexOf("/"));
// 视频文件名
String fileName = filePath.substring(filePath.lastIndexOf("/") + 1);
// 图片名称
String targetFileName = fileName.substring(0, fileName.lastIndexOf("."));
grabber.start();
//设置视频截取帧（建议从5帧开始，防止全是黑屏）
Frame frame = null;
for (int j = 0; j < mod; j++) {
frame = grabber.grabImage();
}
//视频旋转度
String rotate = grabber.getVideoMetadata("rotate");
Java2DFrameConverter converter = new Java2DFrameConverter();
//绘制图片
BufferedImage bi = converter.getBufferedImage(frame);
if (rotate != null) {
// 旋转图片
bi = rotate(bi, Integer.parseInt(rotate));
}
//图片的类型
String imageMat = "jpg";
//图片的完整路径
String imagePath = targerFilePath + File.separator + targetFileName + "." + imageMat;
//创建文件
File output = new File(imagePath);
ImageIO.write(bi, imageMat, output);
//拼接Map信息
result.put("videoWide", bi.getWidth());
result.put("videoHigh", bi.getHeight());
long duration = grabber.getLengthInTime() / (1000 * 1000);
result.put("rotate", StringUtil.isEmpty(rotate)? "0" : rotate);
result.put("format", grabber.getFormat());
result.put("imgPath", output.getPath());
System.out.println("视频的宽:" + bi.getWidth());
System.out.println("视频的高:" + bi.getHeight());
System.out.println("视频的旋转度：" + rotate);
System.out.println("视频的格式：" + grabber.getFormat());
System.out.println("此视频时长（s/秒）：" + duration);
grabber.stop();
System.out.println("截取视频截图结束："+ System.currentTimeMillis());
return result;
}
/**
* @Description: 根据视频旋转度来调整图片
* @param src
* @param angel 视频旋转度
* @return BufferedImage
*/
public static BufferedImage rotate(BufferedImage src, int angel) {
int src_width = src.getWidth(null);
int src_height = src.getHeight(null);
int type = src.getColorModel().getTransparency();
Rectangle rect_des = calcRotatedSize(new Rectangle(new Dimension(src_width, src_height)), angel);
BufferedImage bi = new BufferedImage(rect_des.width, rect_des.height, type);
Graphics2D g2 = bi.createGraphics();
g2.translate((rect_des.width - src_width) / 2, (rect_des.height - src_height) / 2);
g2.rotate(Math.toRadians(angel), src_width / 2, src_height / 2);
g2.drawImage(src, 0, 0, null);
g2.dispose();
return bi;
}
/**
* @Description: 计算图片旋转大小
* @param src
* @param angel
* @return Rectangle
*/
public static Rectangle calcRotatedSize(Rectangle src, int angel) {
if (angel >= 90) {
if (angel / 90 % 2 == 1) {
int temp = src.height;
src.height = src.width;
src.width = temp;
}
angel = angel % 90;
}
double r = Math.sqrt(src.height * src.height + src.width * src.width) / 2;
double len = 2 * Math.sin(Math.toRadians(angel) / 2) * r;
double angel_alpha = (Math.PI - Math.toRadians(angel)) / 2;
double angel_dalta_width = Math.atan((double) src.height / src.width);
double angel_dalta_height = Math.atan((double) src.width / src.height);
int len_dalta_width = (int) (len * Math.cos(Math.PI - angel_alpha - angel_dalta_width));
int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha - angel_dalta_height));
int des_width = src.width + len_dalta_width * 2;
int des_height = src.height + len_dalta_height * 2;
return new java.awt.Rectangle(new Dimension(des_width, des_height));
}
}
3、测试
public static void main(String[] args) throws IOException {
String clientTime ="2020-02-20",startTime="2020-04-03 00:00:00";
System.out.println(clientTime.length());
System.out.println(startTime.length());
/*int s1= DateUtil.compareTo(clientTime,startTime,DateUtil.NORM_DATETIME_PATTERN);
System.out.println(s1);*/
String filePath="D:/home/ddc761004d.mp4";
try {
Map<String, Object> map = VideoUtil.getScreenshot(filePath,25);
} catch (Exception e) {
e.printStackTrace();
}
}
参考地址：
https://blog.csdn.net/lianzhang861/article/details/82014460
https://blog.csdn.net/huangwen123456/article/details/82492375
