android版本4.0.3上的mediaRecorder.start（）的runtimeException

Question

我有这个用于在Android上捕获视频的代码。但是这段代码抛出RuntimeException。我搜索了那个，但我无法得到答复。记录是：

errorrrrrrrrr runtime44444444444!!!

什么行有错误???

private void startRecording()  
    {

         mCamera.unlock();
         mrec = new MediaRecorder(); 
         mrec.setCamera(mCamera); 

         mrec.setAudioSource(MediaRecorder.AudioSource.MIC);
         mrec.setVideoSource(MediaRecorder.VideoSource.CAMERA);

         mrec.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);

         mrec.setVideoFrameRate(24);
         mrec.setVideoSize(720, 480);

         Method[] methods =   mrec.getClass().getMethods();
         for (Method method: methods){
                try
                {
                    if(method.getName().equals("setAudioEncodingBitRate"))
                    {
                       method.invoke(mrec,12200);
                    }
                    else if(method.getName().equals("setVideoEncodingBitRate"))
                    {
                        method.invoke(mrec, 3000000);
                    }
                    else if(method.getName().equals("setAudioSamplingRate"))
                    {
                        method.invoke(mrec,8000);
                    }
                    else if(method.getName().equals("setVideoFrameRate"))
                    {
                        method.invoke(mrec,24);
                    }

                }
                catch (IllegalArgumentException e) 
                {
                    e.printStackTrace();
                } 
                catch (IllegalAccessException e) 
                {
                    e.printStackTrace();
                } 
                catch (InvocationTargetException e) 
                {
                    e.printStackTrace();
                }
                catch (RuntimeException e) 
                 {
                    Log.d("errorrrrrrrrr runtime111111111", "okkkkkkkkkk");
                    e.printStackTrace();
                 }
            }

         mrec.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
         mrec.setVideoEncoder(MediaRecorder.VideoEncoder.H264);

         mrec.setPreviewDisplay(surfaceHolder.getSurface());   
         mrec.setOrientationHint(90); 

         mrec.setOutputFile(Videopath);

         try 
         {
             mrec.prepare();

         } 
         catch (IllegalStateException e) 
         {
           //  releaseRecorder();
          //   return false;
         } 
         catch (IOException e) 
         {
          //   releaseRecorder();
           //  return false;
         }
         catch (RuntimeException e) 
         {
            e.printStackTrace();
         }
         catch(Exception e)
         {
          //  return false;
         }


         try
         {
             mrec.start(); 
         }
         catch (RuntimeException e) 
         {
            Log.d("errorrrrrrrrr runtime44444444444", "okkkkkkkkkk");

            e.printStackTrace();
         }
         catch(Exception e)
         {
          //  return false;
            Log.d("errorrrrrrrrr 33333333333", "okkkkkkkkkk");

         }
         isRecording=true;
        // return true;
    }