錯誤com.xuggle.ferry.JNILibraryLoader - 無法加載庫：xuggle-xuggler;版本：3;

Question

我最近下載了，Xuggler教程代碼：幀捕捉和視頻製作從this link，我添加了所有我的項目中的.jar文件這是需要運行該代碼，但是，當我運行這個代碼然後我得到錯誤：

這裏是我的代碼：

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; 
      } 
     } 
    } 
} 

，我在這家下面的錯誤。

[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 

請解釋爲什麼類加載器是無法加載的.jar文件。

Answer 1

您遇到的問題是無法找到Xuggle使用的本機庫。我懷疑你的類路徑中存在衝突。

如果「所有罐子」是指下載頁面中的罐子，則不應該下載所有罐子。在Xuggler downloads page它表示要麼下載包含所有操作系統的本地庫的xuggle‑xuggler.jar，要麼選擇特定的體系結構。

在嘗試運行你鏈接到的例子，我也做了以下內容：

• 下載xuggle‑xuggler.jar（v.5.2）。我沒有使用maven，所以按照下載頁面的說明，我打開Xuggle POM file來檢查並使用特定版本獲取依賴關係。
• 用一點幫助從谷歌這些依賴性：slf4j-1.6.4，commons-cli 1.1，logback 1.0，（包含兩個必要的罐子），xuggle-utils 1.20和junit你可以忽略。
  下載後，您可以在zip文件中找到POM文件中描述的5個罐子（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），這些罐子是xuggle‑xuggler.jar的依賴關係。
• 在您最喜愛的IDE（我使用Eclipse）中創建一個項目將這些6個jar文件導入到您的項目中，並且您很好。

按照上述步驟，我可以在Windows機器上成功運行測試程序。

我希望有幫助。

Answer 2

它看起來像最好的解決方案是使用Xuggler 5.4與Maven由於How do I have to install/configure Xuggle to not get an UnsatisfiedLinkError?

Answer 3

繼CS的回答結束了對我的工作：

• 代替xuggle，xuggler.jar使用xuggle-xuggler-5.4.jar（谷歌的名稱，如果鏈接中斷）

• 而不是xuggle-utils-1.20.688。罐子使用com.xuggle.utils-1.22.jar

• 創建一個項目，導入6個罐子和運行這個測試：

  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; 
      } 
  }