Question

我最近从this link下载了 Xuggler教程：帧捕获和视频创建的代码，我添加了所有 .jar 文件运行此代码所需的项目，但是，当我运行此代码时，我收到错误：

这是我的代码：

package xug;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

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;

public class VideoThumbnailsExample {

    public static final double SECONDS_BETWEEN_FRAMES = 10;
    private static final String inputFilename = "e:/low_light.mp4";
    private static final String outputFilePrefix = "e:/Frames/processedImages";
    // The video stream index, used to ensure we display frames from one and
    // only one video stream from the media container.
    private static int mVideoStreamIndex = -1;
    // Time of last frame write
    private static long mLastPtsWrite = Global.NO_PTS;
    public static final long MICRO_SECONDS_BETWEEN_FRAMES =
            (long) (Global.DEFAULT_PTS_PER_SECOND * SECONDS_BETWEEN_FRAMES);

    public static void main(String[] args) {

        IMediaReader mediaReader = ToolFactory.makeReader(inputFilename);

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

        mediaReader.addListener(new ImageSnapListener());

        // read out the contents of the media file and
        // dispatch events to the attached listener
        while (mediaReader.readPacket() == null) ;

    }

    private static class ImageSnapListener extends MediaListenerAdapter {

        public void onVideoPicture(IVideoPictureEvent event) {

            if (event.getStreamIndex() != mVideoStreamIndex) {
                // if the selected video stream id is not yet set, go ahead an
                // select this lucky video stream
                if (mVideoStreamIndex == -1) {
                    mVideoStreamIndex = event.getStreamIndex();
                } // no need to show frames from this video stream
                else {
                    return;
                }
            }

            // if uninitialized, back date mLastPtsWrite to get the very first frame
            if (mLastPtsWrite == Global.NO_PTS) {
                mLastPtsWrite = event.getTimeStamp() - MICRO_SECONDS_BETWEEN_FRAMES;
            }

            // if it's time to write the next frame
            if (event.getTimeStamp() - mLastPtsWrite
                    >= MICRO_SECONDS_BETWEEN_FRAMES) {

                String outputFilename = dumpImageToFile(event.getImage());

                // indicate file written
                double seconds = ((double) event.getTimeStamp())
                        / Global.DEFAULT_PTS_PER_SECOND;
                System.out.printf(
                        "at elapsed time of %6.3f seconds wrote: %s\n",
                        seconds, outputFilename);

                // update last write time
                mLastPtsWrite += MICRO_SECONDS_BETWEEN_FRAMES;
            }

        }

        private String dumpImageToFile(BufferedImage image) {
            try {
                String outputFilename = outputFilePrefix
                        + System.currentTimeMillis() + ".png";
                ImageIO.write(image, "png", new File(outputFilename));
                return outputFilename;
            } catch (IOException e) {
                e.printStackTrace();
                return null;
            }
        }
    }
}

我收到了以下错误。

[main] ERROR com.xuggle.ferry.JNILibraryLoader - Could not load library: xuggle-xuggler; version: 3; Visit http://www.xuggle.com/xuggler/faq/ to find common solutions to this problem
java.lang.UnsatisfiedLinkError: no xuggle-xuggler in java.library.path
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1860)
    at java.lang.Runtime.loadLibrary0(Runtime.java:845)
    at java.lang.System.loadLibrary(System.java:1084)
    at com.xuggle.ferry.JNILibraryLoader.loadLibrary0(JNILibraryLoader.java:265)
    at com.xuggle.ferry.JNILibraryLoader.loadLibrary(JNILibraryLoader.java:168)
    at com.xuggle.xuggler.XugglerJNI.<clinit>(XugglerJNI.java:19)
    at com.xuggle.xuggler.Global.<clinit>(Global.java:238)
    at xug.VideoThumbnailsExample.<clinit>(VideoThumbnailsExample.java:28)
Exception in thread "main" Java Result: 1

请解释为什么类加载器无法加载 .jar 文件。

Answer 1

您遇到的问题是无法找到Xuggle使用的本机库。我怀疑你的类路径中存在冲突。

如果“所有罐子”是指下载页面中的罐子，则不应下载所有罐子。在Xuggler downloads page，它表示要么下载包含所有操作系统的本机库的xuggle‑xuggler.jar，要么选择特定的体系结构。

在尝试运行您链接的示例时，我已完成以下操作：

已下载xuggle‑xuggler.jar（第5.2节）。我没有使用maven，所以根据下载页面的内容，我打开Xuggle POM file来检查并使用特定版本获取依赖项。
使用谷歌的一些帮助，这些依赖项包括：slf4j-1.6.4，commons-cli 1.1，logback 1.0，（包含两个必需的广告），xuggle-utils 1.20和{{1}你可以忽略的下载后，您可以在zip文件中找到POM文件中描述的5个jars（junit），它们是slf4j-api-1.6.4.jar, commons-cli-1.1.jar, logback-core-1.0.0.jar, logback-classic-1.0.0.jar, xuggle-utils-1.20.688.jar的依赖项。
在您喜欢的IDE（我使用Eclipse）中创建一个项目，将这6个jar文件导入您的项目，您就可以了。

按照上述步骤，我能够在Windows机器上成功运行您的测试程序。

我希望有所帮助。

Answer 2

看起来最好的解决方案是使用Xuggler 5.4和maven，因为How do I have to install/configure Xuggle to not get an UnsatisfiedLinkError?

Answer 3

按照c.s.的回答，这最终为我工作：

使用xuggle-xuggler-5.4.jar代替xuggle-xuggler.jar（如果链接已损坏，请使用google名称）
使用com.xuggle.utils-1.22.jar

创建一个项目，导入6个罐子并运行它来测试：

import com.xuggle.xuggler.ICodec;
import com.xuggle.mediatool.ToolFactory;
import com.xuggle.mediatool.IMediaWriter;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.concurrent.TimeUnit;

public class XuggleTest {

    private static int idx = 1;
    private static final int WIDTH = 500;
    private static final int HEIGHT = 500;
    private static final int NFRAMES = 200;

    public static void main(String[] arguments) {

        // Create writer
        IMediaWriter writer = ToolFactory.makeWriter("output.mp4");
        writer.addVideoStream(0, 0, ICodec.ID.CODEC_ID_MPEG4, WIDTH, HEIGHT);
        long ms = 15; // ms per frame

        for (int i = 0; i < NFRAMES; i++) {

            BufferedImage frame = convert(getFrame());
            long time = i * ms;
            writer.encodeVideo(0, frame, time, TimeUnit.MILLISECONDS);

            idx++;
        }
        System.out.println("Finished writing file: " + System.getProperty("user.dir") + File.separator + writer.getUrl());

        writer.close();
    }

    private static BufferedImage convert(BufferedImage value) {
        // Convert data type
        BufferedImage result = new BufferedImage(value.getWidth(), value.getHeight(), BufferedImage.TYPE_3BYTE_BGR);
        result.getGraphics().drawImage(value, 0, 0, null);
        return result;
    }

    private static BufferedImage getFrame() {
        // Create image frame
        BufferedImage img = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_ARGB);
        img.createGraphics().fillRoundRect(idx, idx, idx, idx, 10, 10);
        return img;
    }
}

Answer 4

只需在Windows OS中下载xuggler 3.4 exe并添加jar文件 1）xuggle-xuggler-arch-x86_64-w64-mingw32.jar您可以通过以下链接获取此jar：
https://files.liferay.com/mirrors/xuggle.googlecode.com/svn/trunk/repo/share/java/xuggle/xuggle-xuggler/5.4/

错误com.xuggle.ferry.JNILibraryLoader - 无法加载库：xuggle-xuggler;版本：3;

4 个答案: