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package cn.wisenergy.common.utils;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import org.bytedeco.javacpp.opencv_core;
import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.Frame;
import org.bytedeco.javacv.Java2DFrameConverter;
/**
* 截取视频图片
*
* @ClassName: FrameGrabberKit
*/
public class FrameGrabberKit {
/**
* 获取视频图片
*
* @param videofile 源视频文件路径
* @param framefile 截取帧的图片存放路径
* @param imgfile 视频封面图保存路径
* @return
*/
public static String getVedioImg(String videofile, String framefile, String imgfile) {
String ImgUrl = "";
//截取封面图
try {
fetchFrame(videofile, framefile);
} catch (Exception e) {
e.printStackTrace();
}
// 完整的ImgUrl
ImgUrl = imgfile;//视频封面图保存路径
return ImgUrl;
}
/**
* 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 例：F:\hfkjrecorder\target\4.jpg
* @throws Exception
*/
public static void fetchFrame(String videofile, String framefile) throws Exception {
FFmpegFrameGrabber ff = new FFmpegFrameGrabber(videofile);
ff.start();
int lenght = ff.getLengthInFrames();
int i = 0;
int interceptionFrames = 30;//截取第几帧
//默认截取第50帧，如果第50帧大于视频总帧数的8成直接取长度lenght * 0.3
if (interceptionFrames >= lenght * 0.8) {
interceptionFrames = (int) (lenght * 0.3);
}
Frame f = null;
while (i < lenght) {
// 过滤 前 interceptionFrames 帧，避免出现全黑的图片，依自己情况而定
f = ff.grabFrame();
if ((i > interceptionFrames) && (f.image != null)) {
break;
}
i++;
}
int owidth = f.imageWidth;
int oheight = f.imageHeight;
// 对截取的帧进行等比例缩放
int width = 800;
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);
File targetFile = new File(framefile);
ImageIO.write(bi, "jpg", targetFile);
//ff.flush();
ff.stop();
}
}