title: convert mp3 to wav using xuggle getting exception
body: <p>I am trying to convert mp3 to wav and the code is here:</p>
  
  <pre><code>String mp3 = "F:\\work\\pic2talk38512.mp3";
  String wav = "F:\\work\\pic2talk38512.wav";
  TranscodeAudioAndVideo.transcodeTest(mp3, wav);
  
  public static void transcode(String sourceUrl, String destinationUrl) {
      IMediaReader reader = ToolFactory.makeReader(sourceUrl);
      reader.addListener(ToolFactory.makeWriter(destinationUrl, reader));
  
      while (reader.readPacket() == null)
              do {
              } while (false);
  }
  </code></pre>
  
  <p>I got this exception:</p>
  
  <pre><code>java.lang.UnsupportedOperationException: could not guess codec
  at com.xuggle.xuggler.IContainerFormat.establishOutputCodecId(IContainerFormat.java:454)
  at com.xuggle.xuggler.IContainerFormat.establishOutputCodecId(IContainerFormat.java:327)
  at com.xuggle.xuggler.IContainerFormat.establishOutputCodecId(IContainerFormat.java:300)
  at com.xuggle.mediatool.MediaWriter.addStreamFromContainer(MediaWriter.java:1134)
  at com.xuggle.mediatool.MediaWriter.getStream(MediaWriter.java:1039)
  at com.xuggle.mediatool.MediaWriter.encodeVideo(MediaWriter.java:742)
  at com.xuggle.mediatool.MediaWriter.encodeVideo(MediaWriter.java:783)
  at com.xuggle.mediatool.MediaWriter.onVideoPicture(MediaWriter.java:1434)
  at com.xuggle.mediatool.AMediaToolMixin.onVideoPicture(AMediaToolMixin.java:166)
  at com.xuggle.mediatool.MediaReader.dispatchVideoPicture(MediaReader.java:610)
  at com.xuggle.mediatool.MediaReader.decodeVideo(MediaReader.java:519)
  at com.xuggle.mediatool.MediaReader.readPacket(MediaReader.java:475)
  at com.renren.intl.soundsns.pictalk.utils.TranscodeAudioAndVideo.transcodeTest(TranscodeAudioAndVideo.java:75)
  at com.renren.intl.soundsns.pictalk.utils.TranscodeAudioAndVideoTest.convert(TranscodeAudioAndVideoTest.java:12)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:597)
  at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
  at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
  at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
  at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
  at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
  at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
  at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
  at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
  at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
  </code></pre>
  
  <p>I know that xuggle can figure out the conversion by the extension.But why this time is failed?</p>
  
  <p>thanks</p>
  
  <p>edit:</p>
  
  <p>previously I can convert mp3 which params(MPEG 22.1KHZ 32kbps) to wav, but If I use the mp3(MPEG 44.1KHZ 62kbps) I got this exception?</p>
  
  <p>How this happened?</p>