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

我最近从这个链接下载了Xuggler Tutorial：Frames Capture和Video Creation的代码，我在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; } } } } 

我在这里得到了以下错误。

 [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.(XugglerJNI.java:19) at com.xuggle.xuggler.Global.(Global.java:238) at xug.VideoThumbnailsExample.(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。

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jar子”是指下载页面中的jar子，则不应下载所有jar子。 在Xuggler下载页面，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。

在尝试运行您链接到的示例时，我已完成以下操作：

• 下载了xuggle-xuggler.jar （v.5.2）。 我没有使用maven，所以根据下载页面的内容，我打开了Xuggle POM文件来检查并使用特定版本获取依赖项。
• 使用google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jar）， xuggle-utils 1.20和junit ，你可以忽略它们。
  下载后，您可以在zip文件中找到5个jar子（ 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 ）在POM文件中描述了xuggle‑xuggler.jar的依赖关系。
• 在您喜欢的IDE中创建一个项目（我使用Eclipse）将这6个jar文件导入到您的项目中，您很高兴。

按照上面的步骤，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将Xuggler 5.4与maven一起使用，因为我必须如何安装/配置Xuggle才能获得UnsatisfiedLinkError？

Answer 3

根据cs的回答，这最终为我工作：

• 而不是xuggle-xuggler.jar使用xuggle-xuggler-5.4.jar （如果链接断开则google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jar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; } }