将屏幕和网络摄像头录制为视频文件

Question

我正在尝试创建一个应用程序来记录用户或网络摄像头的屏幕，并保存到视频文件中。

我尝试了Java Media Framework使其工作，但它在Windows 64位中失败了。我发现Java Media Framework已经很旧了，现在还不支持它：（

我的问题是：有没有其他库可以帮助我们从网络摄像头录制屏幕和视频？如果不支持Java，什么语言可以提供帮助？

我发现一些应用程序具有相同的功能：+http://www.screencast-o-matic.com/+http://www.apowersoft.com/free-online-screen-recorder这是一个java小程序，用户无需安装即可从服务器下载。

提前感谢！

更新：我正在HTML5 中找到另一个解决方案

更新：2013/07/05**我发现WebRTC 1.0可以达到这个解决方案，但谷歌Chrome还没有支持媒体流记录器。

Answer 1

我有一个使用com.xuggle包记录屏幕的示例代码

import java.awt.AWTException;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.util.concurrent.TimeUnit;
import com.xuggle.mediatool.IMediaWriter;
import com.xuggle.mediatool.ToolFactory;
import com.xuggle.xuggler.ICodec;
public class ScreenRecordingExample {
    private static final double FRAME_RATE = 50;
private static final int SECONDS_TO_RUN_FOR = 20;
    private static final String outputFilename = "c:/mydesktop.mp4";
    private static Dimension screenBounds;
    public static void main(String[] args) {
        // let's make a IMediaWriter to write the file.
    final IMediaWriter writer = ToolFactory.makeWriter(outputFilename);
        screenBounds = Toolkit.getDefaultToolkit().getScreenSize();
        // We tell it we're going to add one video stream, with id 0,
        // at position 0, and that it will have a fixed frame rate of FRAME_RATE.
        writer.addVideoStream(0, 0, ICodec.ID.CODEC_ID_MPEG4, 
                   screenBounds.width/2, screenBounds.height/2);
        long startTime = System.nanoTime();
        for (int index = 0; index < SECONDS_TO_RUN_FOR * FRAME_RATE; index++) {
            // take the screen shot
            BufferedImage screen = getDesktopScreenshot();
            // convert to the right image type
            BufferedImage bgrScreen = convertToType(screen, 
               BufferedImage.TYPE_3BYTE_BGR);
            // encode the image to stream #0
            writer.encodeVideo(0, bgrScreen, System.nanoTime() - startTime, 
                   TimeUnit.NANOSECONDS);
            // sleep for frame rate milliseconds
            try {
                Thread.sleep((long) (1000 / FRAME_RATE));
            } 
            catch (InterruptedException e) {
                // ignore
            }
        }
        // tell the writer to close and write the trailer if  needed
        writer.close();
    }
    public static BufferedImage convertToType(BufferedImage sourceImage, int targetType) {
        BufferedImage image;
        // if the source image is already the target type, return the source image
        if (sourceImage.getType() == targetType) {
            image = sourceImage;
        }
        // otherwise create a new image of the target type and draw the new image
        else {
            image = new BufferedImage(sourceImage.getWidth(), 
                 sourceImage.getHeight(), targetType);
        image.getGraphics().drawImage(sourceImage, 0, 0, null);
        }
        return image;
    }
    private static BufferedImage getDesktopScreenshot() {
        try {
            Robot robot = new Robot();
        Rectangle captureSize = new Rectangle(screenBounds);
        return robot.createScreenCapture(captureSize);
        } 
        catch (AWTException e) {
            e.printStackTrace();
            return null;
        }
    }
}