JavaCV实现将视频以帧方式抽取

使用前： 在用JavaCV实现以帧方式抽取视频的前，我们需要先从bytedeco/javacv下载第三方的压缩包，解压后按自己的需求往自己的IDE ( * IDEA / Eclipse * ) 导入解压缩包下JAR文件;

接下来就以代码方式来说明如何利用Javacv来将视频以帧的方式抽取出来:

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

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import static org.bytedeco.javacpp.opencv_core.IplImage;
import static org.bytedeco.javacpp.opencv_core.cvReleaseImage;
import static org.bytedeco.javacpp.opencv_imgcodecs.cvLoadImage;
import static org.bytedeco.javacpp.opencv_imgcodecs.cvSaveImage;
import static org.bytedeco.javacpp.opencv_imgproc.cvSmooth;

public class JavaCV {

  // the image's path;
  final static String imagePath = "/home/lance/abc.jpg/";
  // the vedio's path and filename;
  final static String vedioPath = "/home/lance/target-a/";
  final static String vedioName = "origin-a.mp4";

  public static void main(String[] args) throws Exception {
    smooth(imagePath);
    grabberFFmpegImage(vedioPath + vedioName, vedioPath
        , vedioName, 30);
  }

  // the method of compress image;
  public static void smooth(String fileName) {
    IplImage iplImage = cvLoadImage(fileName);
    if (iplImage != null) {
      cvSmooth(iplImage, iplImage);
      cvSaveImage(fileName, iplImage);
      cvReleaseImage(iplImage);
    }
  }

  // grab ffmpegImage from vedio;
  public static void grabberFFmpegImage(String filePath, String fileTargetPath
      , String fileTargetName, int grabSize) throws Exception{
    FFmpegFrameGrabber ff = FFmpegFrameGrabber.createDefault(filePath);
    ff.start();
    for (int i = 0; i < grabSize; i++){
      Frame frame = ff.grabImage();
      doExecuteFrame(frame, filePath, fileTargetName, i);
    }
    ff.stop();
  }

  // grab frame from vedio;
  public static void doExecuteFrame(Frame frame, String targetFilePath, String targetFileName, int index) {
    if ( frame == null || frame.image == null) {
      return;
    }
    Java2DFrameConverter converter = new Java2DFrameConverter();
    String imageMat = "jpg";
    String fileName = targetFilePath + File.pathSeparator + targetFileName + "_" + index + "." + imageMat;
    BufferedImage bi = converter.getBufferedImage(frame);
    File output = new File(fileName);
    try{
      ImageIO.write(bi, imageMat, output);
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

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