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

Question

我最近从这个链接下载了Xuggler 教程：帧捕获和视频创建的代码，我已经在我的项目中添加了运行此代码所需的所有.jar文件，但是，当我运行此代码时，我得到了错误：

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;
            }
        }
    }
}

我在这方面遇到了以下错误。

[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Class-Loader无法加载.jar文件。

score 4 · Accepted Answer

您遇到的问题是找不到 Xuggle 使用的本机库。我怀疑您的类路径中存在冲突。

如果“所有 jars”是指下载页面中的 jars，则不应下载所有这些 jars。在Xuggler 下载页面上，它说要么下载xuggle‑xuggler.jar包含所有操作系统的本机库，要么选择特定架构。

在尝试运行您链接到的示例时，我执行了以下操作：

下载了 xuggle‑xuggler.jar (v.5.2)。我没有使用 maven，所以根据下载页面上的说明，我打开了Xuggle POM 文件以检查并获取使用特定版本的依赖项。
使用谷歌的一些帮助，这些依赖项是：slf4j-1.6.4， commons-cli 1.1，logback 1.0，（包含两个必需的 jars），xuggle-utils 1.20，junit您可以忽略它们。
下载后，您可以在 zip 文件中找到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.jarPOM 文件中描述的 5 个 jars ()，它们是xuggle‑xuggler.jar.
在您最喜欢的 IDE（我使用 Eclipse）中创建一个项目，将这 6 个 jar 文件导入到您的项目中，您就可以开始了。

按照上述步骤，我能够在 Windows 机器上成功运行您的测试程序。

我希望这会有所帮助。

score 0 · Accepted Answer

看起来最好的解决方案是使用带有 maven 的 Xuggler 5.4，因为我必须如何安装/配置 Xuggle 才不会得到 UnsatisfiedLinkError？

score 0 · Accepted Answer

按照cs的回答，这对我有用：

而不是 xuggle‑xuggler.jar 使用xuggle-xuggler-5.4.jar（如果链接断开，谷歌名称）
而不是 xuggle-utils-1.20.688.jar 使用com.xuggle.utils-1.22.jar

创建一个项目，导入 6 个 jars 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;
    }
}

score 0 · Accepted Answer

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

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

4 回答 4

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