Question

我想从带有java的视频文件（mov）中获取帧样本（jpeg）。是否有捷径可寻。当我在谷歌搜索所有我能找到的是从多个jpgs制作mov。我不知道也许我找不到合适的关键词。

Answer 1

我知道原来的问题已经解决了，不过，我发布这个答案，万一其他人像我一样被卡住了。

从昨天起，我已经尝试过所有事情，我的意思是做到这一点。所有可用的Java库都已过时，不再维护或缺少任何可用的文档（严重??！？！）

我尝试了JFM（旧的和无用的），JCodec（没有任何文档），JJMpeg（看起来很有前途，但由于缺少Java级文档而使用非常困难和繁琐），OpenCV自动Java构建和一些其他我不记得的图书馆。

最后，我决定看看JavaCV的（Github link）课程，瞧！它包含FFMPEG绑定和详细的文档。

<dependency>
    <groupId>org.bytedeco</groupId>
    <artifactId>javacv</artifactId>
    <version>1.0</version>
</dependency>

事实证明，有一种非常简单的方法可以将视频文件从视频文件中提取到BufferedImage，并通过扩展名提取JPEG文件。 FFmpegFrameGrabber类可以很容易地用于抓取单个帧并将它们转换为BufferedImage。代码示例如下：

FFmpegFrameGrabber g = new FFmpegFrameGrabber("textures/video/anim.mp4");
g.start();

for (int i = 0 ; i < 50 ; i++) {
    ImageIO.write(g.grab().getBufferedImage(), "png", new File("frame-dump/video-frame-" + System.currentTimeMillis() + ".png"));
}

g.stop();

基本上，此代码会转储视频的前50帧并将其保存为PNG文件。好处是内部搜索功能，适用于实际帧而非关键帧（我使用JCodec时遇到的问题）

您可以参考JavaCV的主页，了解有关可用于从WebCams捕获帧的其他类的更多信息。希望此答案有所帮助： - ）

Answer 2

Xuggler完成这项工作。他们甚至提供了一个完全符合我需要的示例代码。链接在

之下

http://xuggle.googlecode.com/svn/trunk/java/xuggle-xuggler/src/com/xuggle/mediatool/demos/DecodeAndCaptureFrames.java

我修改了此链接中的代码，使其仅保存视频的第一帧。

import javax.imageio.ImageIO;

import java.io.File;

import java.awt.image.BufferedImage;

import com.xuggle.mediatool.IMediaReader;
import com.xuggle.mediatool.MediaListenerAdapter;
import com.xuggle.mediatool.ToolFactory;
import com.xuggle.mediatool.event.IVideoPictureEvent;
import com.xuggle.xuggler.Global;

/**
 *  * @author aclarke
 *    @author trebor
 */

public class DecodeAndCaptureFrames extends MediaListenerAdapter
{
  private int mVideoStreamIndex = -1;
  private boolean gotFirst = false;
  private String saveFile;
  private Exception e;
  /** Construct a DecodeAndCaptureFrames which reads and captures
   * frames from a video file.
   * 
   * @param filename the name of the media file to read
   */

  public DecodeAndCaptureFrames(String videoFile, String saveFile)throws Exception
  {
    // create a media reader for processing video
    this.saveFile = saveFile;
    this.e = null;
     IMediaReader reader = ToolFactory.makeReader(videoFile);

    // stipulate that we want BufferedImages created in BGR 24bit color space
    reader.setBufferedImageTypeToGenerate(BufferedImage.TYPE_3BYTE_BGR);


    // note that DecodeAndCaptureFrames is derived from
    // MediaReader.ListenerAdapter and thus may be added as a listener
    // to the MediaReader. DecodeAndCaptureFrames implements
    // onVideoPicture().

    reader.addListener(this);

    // read out the contents of the media file, note that nothing else
    // happens here.  action happens in the onVideoPicture() method
    // which is called when complete video pictures are extracted from
    // the media source

      while (reader.readPacket() == null && !gotFirst);

      if (e != null)
          throw e;
  }



  /** 
   * Called after a video frame has been decoded from a media stream.
   * Optionally a BufferedImage version of the frame may be passed
   * if the calling {@link IMediaReader} instance was configured to
   * create BufferedImages.
   * 
   * This method blocks, so return quickly.
   */

  public void onVideoPicture(IVideoPictureEvent event)
  {
    try
    {
      // if the stream index does not match the selected stream index,
      // then have a closer look

      if (event.getStreamIndex() != mVideoStreamIndex)
      {
        // if the selected video stream id is not yet set, go ahead an
        // select this lucky video stream

        if (-1 == mVideoStreamIndex)
          mVideoStreamIndex = event.getStreamIndex();

        // otherwise return, no need to show frames from this video stream

        else
          return;
      }

      ImageIO.write(event.getImage(), "jpg", new File(saveFile));
      gotFirst = true;

    }
    catch (Exception e)
    {
      this.e = e;
    }
  }
}

Answer 3

以下是BoofCV：

的方法

String fileName = UtilIO.pathExample("tracking/chipmunk.mjpeg");

MediaManager media = DefaultMediaManager.INSTANCE;

ConfigBackgroundBasic configBasic = new ConfigBackgroundBasic(30, 0.005f);
ImageType imageType = ImageType.single(GrayF32.class);
BackgroundModelMoving background = FactoryBackgroundModel.movingBasic(configBasic, new PointTransformHomography_F32(), imageType);

SimpleImageSequence video = media.openVideo(fileName, background.getImageType());

ImageBase nextFrame;
while(video.hasNext()) {
    nextFrame = video.next();

    // Now do something with it...
}

Answer 4

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import org.bytedeco.javacpp.opencv_core.IplImage;
import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.FrameGrabber.Exception;

public class Read{
    public static void main(String []args) throws IOException, Exception
    {
        FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber("C:/Users/Digilog/Downloads/Test.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();
        }


    }
}

Answer 5

也许这会对你有所帮助：

Buffer buf = frameGrabber.grabFrame();
// Convert frame to an buffered image so it can be processed and saved
Image img = (new BufferToImage((VideoFormat) buf.getFormat()).createImage(buf));
buffImg = new BufferedImage(img.getWidth(this), img.getHeight(this), BufferedImage.TYPE_INT_RGB);
//TODO saving the buffImg

获取更多信息：

How to take single snapshots from a webcam?

Answer 6

下面显示了从媒体文件请求帧的基本代码。

完整的源代码和视频演示：
"Media File Processing"示例使用 Marvin Framework ..

public class MediaFileExample implements Runnable{

    private MarvinVideoInterface    videoAdapter;
    private MarvinImage             videoFrame;

    public MediaFileExample(){
        try{
            // Create the VideoAdapter used to load the video file
            videoAdapter = new MarvinJavaCVAdapter();
            videoAdapter.loadResource("./res/snooker.wmv");

            // Start the thread for requesting the video frames 
            new Thread(this).start();
        }
        catch(MarvinVideoInterfaceException e){e.printStackTrace();}
    }

    @Override
    public void run() {
        try{
            while(true){
                // Request a video frame
                videoFrame = videoAdapter.getFrame();
            }
        }catch(MarvinVideoInterfaceException e){e.printStackTrace();}
    }

    public static void main(String[] args) {
        MediaFileExample m = new MediaFileExample();
    }
}

如何从视频中获取帧样本（jpeg）（mov）

6 个答案: