Save frames / images of a video

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Save frames / images of a video

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#1 by (1 votes)

3

Hello,

I need to save images / frames of a video. The idea is to create a movie preview before it starts.

The problem is that I'm not able to implement the examples I found.

1st Example to take a screenshot of the component with JavaFX, it works but the video must be playing.

Code:

...
    // 
    private void saveAsPng(Node n) {
        WritableImage image = n.snapshot(new SnapshotParameters(), null);
        // TODO: probably use a file chooser here
        File file = new File("D:\movie12.png");

        try {
            ImageIO.write(SwingFXUtils.fromFXImage(image, null), "png", file);
        } catch (IOException e) {
            System.out.println("Não foi possível capturar imagem do video");
        }
    }
...

2º Making use of the JavaCV or Xuggler Libraries seems to be possible, but I can not do this with either one.

JavaCV

import com.googlecode.javacv.FFmpegFrameGrabber;
import com.googlecode.javacv.cpp.opencv_core.IplImage;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;

public class ZzzzzzzSaveImgFromVideo{
    public static void main(String []args) throws IOException, Exception
    {
        FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber("D:\Movie..................mp4");
        frameGrabber.start();
        IplImage i;
        try {

            i = frameGrabber.grab();
            BufferedImage  bi = i.getBufferedImage();
            ImageIO.write(bi,"png", new File("D:/Img.png"));
            frameGrabber.stop();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


    }
}

error:

run:
Exception in thread "main" java.lang.NoClassDefFoundError: com/googlecode/javacpp/Pointer
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at zzzzzzzsaveimgfromvideo.ZzzzzzzSaveImgFromVideo.main(ZzzzzzzSaveImgFromVideo.java:18)
Caused by: java.lang.ClassNotFoundException: com.googlecode.javacpp.Pointer
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 13 more

link: link

I'm not using Maven:

Bookstores added to the project: javacpp javacv

issues:

Does anyone know which libraries are needed to por does javaCV work?
Is it necessary to have already installed on the OpenCV PC or has nothing to do?
Some more practical code for what I want to do?

java imagem javafx

asked by anonymous 30.11.2017 / 15:54

1 answer

How to install .ipa without using the Appstore Code to generate continuous beep

score 1 · Accepted Answer

Example using Xuggle to generate images of a video and resize them by passing its path and the interval of seconds between frames:

public static final double SECONDS_BETWEEN_FRAMES = 1;
private static final int IMG_WIDTH = 300;
private static final int IMG_HEIGHT = 225;

String fileName = "video_path";

IMediaReader mediaReader = null;
mediaReader = ToolFactory.makeReader(fileName);
mediaReader.setBufferedImageTypeToGenerate(BufferedImage.TYPE_3BYTE_BGR);
mediaReader.addListener(new ImageSnapListener());
while (mediaReader.readPacket() == null)
   do {} while(false);



/**
 * Classe auxiliar para gerar imagem do arquivo vídeo
 * de upload
 * @author allan-braga
 *
 */
private  class ImageSnapListener extends MediaListenerAdapter{
    @Override
    public void onVideoPicture(IVideoPictureEvent event) {
            String outputFilename = dumpImageToFile(event.getImage());
        }
    }
    private String dumpImageToFile(BufferedImage image) {
        try {


            String outputFilename =  "PATH_AND_NAME" + ".png";
            ImageIO.write(image, "png", new File(outputFilename));

            //Redimensiona a imagem 
            BufferedImage originalImage = ImageIO.read(new File(outputFilename));
            int type = originalImage.getType() == 0? BufferedImage.TYPE_INT_ARGB : originalImage.getType();

            BufferedImage resizeImagePng = resizeImage(originalImage, type);
            ImageIO.write(resizeImagePng, "png", new File(outputFilename));

            return outputFilename;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }
}

private static BufferedImage resizeImage(BufferedImage originalImage, int type){
    BufferedImage resizedImage = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, type);
    Graphics2D g = resizedImage.createGraphics();
    g.drawImage(originalImage, 0, 0, IMG_WIDTH, IMG_HEIGHT, null);
    g.dispose();
    return resizedImage;
 }

Download: link