java使用OpenCV从视频文件中获取帧

import com.googlecode.javacv.cpp.opencv_highgui;
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.highgui.Highgui;
import org.opencv.highgui.VideoCapture;
/**
* Created by fang on 17-4-6.
* 实现每播放一秒视频就截取一张图片保存到本地的操作
* 没有使用ffmpeg,则只能读取avi格式视频
* 下载google javcv.jar
* sudo add-apt-repository ppa:kirillshkrogalev/ffmpeg-next
* sudo apt-get update
* sudo apt-get install ffmpeg
* /home/fang/BigDataSoft/opencv-2.4.13/3rdparty/ffmpeg中有opencv_ffmpeg_64.dll文件
* 不能解析视频,提示moov atom not found 是文件有错
*/
public class GetFrameFormVideo {
public static void main(String[] args) {
// System.out.println("Welcome to OpenCV " + Core.VERSION);
// System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
// Mat m = Mat.eye(3, 3, CvType.CV_8UC1);
// System.out.println("m = " + m.dump());
//加载本地的OpenCV库，这样就可以用它来调用Java API
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
run2();
}
public static void run2() {
//读取视频文件
VideoCapture cap = new VideoCapture("/home/fang/Downloads/src_11.mp4");
System.out.println(cap.isOpened());
//判断视频是否打开
if (cap.isOpened()) {
//总帧数
double frameCount = cap.get(opencv_highgui.CV_CAP_PROP_FRAME_COUNT);
System.out.println("视频总帧数:"+frameCount);
//帧率
double fps = cap.get(opencv_highgui.CV_CAP_PROP_FPS);
System.out.println("视频帧率"+fps);
//时间长度
double len = frameCount / fps;
System.out.println("视频总时长:"+len);
Double d_s = new Double(len);
System.out.println(d_s.intValue());
Mat frame = new Mat();
for (int i = 0; i < d_s.intValue(); i++) {
//设置视频的位置(单位:毫秒)
cap.set(opencv_highgui.CV_CAP_PROP_POS_MSEC, i * 1000);
//读取下一帧画面
if (cap.read(frame)) {
System.out.println("正在保存");
//保存画面到本地目录
Highgui.imwrite("/home/fang/images/" + i + ".jpg", frame);
}
}
//关闭视频文件
cap.release();
}
}
}