视频

java截取视频首帧并旋转正向

package test;

import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

import javax.imageio.ImageIO;

import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.Frame;
import org.bytedeco.javacv.Java2DFrameConverter;

public class VideoTest {

    public static String image_type="jpg";
    public static String file_type="mp4";

    public static void main(String[] args) {
        String videofile="C:/xmqtest/test视频.mp4";//或网络视频地址
        String framefileDir="C:/xmqtest/";
        String targetFilePath=fetchFrame(videofile,framefileDir);
    }

    /**
     * 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 String fetchFrame(String videofile, String framefileDir){
        try{
            int startIndex=videofile.lastIndexOf(‘/‘);
            String fileName;
            if(startIndex==-1){
                fileName=videofile.substring(videofile.lastIndexOf(‘\\‘)+1, videofile.lastIndexOf(‘.‘));
            }else{
                fileName=videofile.substring(startIndex+1, videofile.lastIndexOf(‘.‘)+1);
            }
            String targetFileName=framefileDir+fileName+image_type;
            File targetFile=createFile(targetFileName);
            FFmpegFrameGrabber ff = new FFmpegFrameGrabber(videofile);
            ff.start();
            String rotate_old=ff.getVideoMetadata("rotate");//视频旋转角度，可能是null
            int length = ff.getLengthInFrames();
            int i = 0;
            Frame f = null;
            while (i < length) {
                // 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 = f.imageWidth;
            int oheight = f.imageHeight;
            // 对截取的帧进行等比例缩放
            int width = 300;//生成图片宽度为300px
            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, image_type, targetFile);
            ff.stop();
            //有需要旋转
            if(rotate_old!=null && !rotate_old.isEmpty()){
                int rotate=Integer.parseInt(rotate_old);
                rotatePhonePhoto(targetFileName,rotate);
            }
            return targetFileName;
        }catch(Exception e){
            e.printStackTrace();
        }
        return null;
    }

    /***
     * 创建文件，目录不存在则先创建目录在创建文件
     * @param destFileName
     * @return
     */
    public static File createFile(String destFileName) {
        try {
            File file = new File(destFileName);
            if (!file.getParentFile().exists()) {
                file.getParentFile().mkdirs();
            }
            file.createNewFile();
            return file;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 删除单个文件
     */
    public static void deleteFile(String sPath) {
        File file = new File(sPath);
        if (file.isFile() && file.exists()) {
            file.delete();
        }
    }

    /**
     * 旋转照片
     * 
     * @return
     */
    public static String rotatePhonePhoto(String fullPath, int angel) {
        BufferedImage src;
        try {
            src = ImageIO.read(new File(fullPath));
            int src_width = src.getWidth(null);
            int src_height = src.getHeight(null);

            int swidth = src_width;
            int sheight = src_height;

            if (angel == 90 || angel == 270) {
                swidth = src_height;
                sheight = src_width;
            }
            Rectangle rect_des = new Rectangle(new Dimension(swidth, sheight));
            BufferedImage res = new BufferedImage(rect_des.width, rect_des.height, BufferedImage.TYPE_INT_RGB);
            Graphics2D g2 = res.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, null, null);
            ImageIO.write(res,image_type, new File(fullPath));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return fullPath;

    }
}

说明点：

1. 加入依赖，经测试两个依赖在windows环境，linux环境下正常使用。如果本地windows环境正常但是在linux下失败，请使用以下依赖。

<dependency>
   <groupId>org.bytedeco</groupId>
   <artifactId>javacv</artifactId>
   <version>1.4.3</version>
</dependency>

<dependency>
<groupId>org.bytedeco.javacpp-presets</groupId>
<artifactId>ffmpeg-platform</artifactId>
<version>4.0.2-1.4.3</version>
</dependency>

2. 针对iphone手机视频等需要进行首帧图片旋转，否则出现首帧图片横着的情况。如代码部分：

String rotate_old=ff.getVideoMetadata("rotate");//视频旋转角度，可能是null

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