我最近从 this link 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,出现错误:
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。
最佳答案
您遇到的问题是无法找到 Xuggle 使用的 native 库。我怀疑您的类路径中存在冲突。
如果“所有 jar”是指下载页面中的 jar,则不应下载所有这些。在 Xuggler downloads page它表示要么下载包含所有操作系统的 native 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,我做了以下操作:
- 已下载 xuggle‑xuggler.jar (第 5.2 节)。我没有使用 Maven,所以根据下载页面上的说明,我打开了 Xuggle POM file使用特定版本检查并获取依赖项。
- 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 ,(包含两个所需的 jar ),xuggle-utils 1.20和你可以忽略的
junit
。
下载后,您可以在 zip 文件中找到 5 个 jar(slf4j-api-1.6.4.jar、commons-cli-1.1.jar、logback-core-1.0.0.jar、logback-classic-1.0.jar)。 0.jar、xuggle-utils-1.20.688.jar
)在 POM 文件中描述为xuggle‑xuggler.jar
的依赖项。 - 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。
希望对您有所帮助。
关于java - 错误 com.xuggle.ferry.JNILibraryLoader - 无法加载库 : xuggle-xuggler; version: 3;,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18077307/