Program: 187169
Project: 187169
Buggy source:
public void export(){
  try {
    ffmpegc=new FfmpegController(mContext,mFileProject);
    maOut=new MediaDesc();
    maOut.path=new File(mFileProject,"String_Node_Str").getCanonicalPath();
    Message msg=mHandler.obtainMessage(0);
    msg.getData().putString("String_Node_Str","String_Node_Str");
    mHandler.sendMessage(msg);
    maExport=new MediaAudioExporter(mContext,mHandler,mMediaList,mFileProject,maOut);
    maExport.setFadeLength(mFadeLen);
    maExport.export();
    SoxController sxCon=new SoxController(mContext,sc);
    if (mAudioTracks.size() > 0) {
      ArrayList<String> mAudioTracksPaths=new ArrayList<String>();
      int idxAudioTracks=0;
      for (      MediaDesc audioTrack : mAudioTracks) {
        msg=mHandler.obtainMessage(0);
        msg.getData().putString("String_Node_Str","String_Node_Str" + (idxAudioTracks + 1) + "String_Node_Str"+ mAudioTracks.size());
        mHandler.sendMessage(msg);
        File fileAudioTrack=new File(mFileProject,idxAudioTracks + "String_Node_Str");
        MediaDesc out=ffmpegc.convertToWaveAudio(audioTrack,fileAudioTrack.getCanonicalPath(),mAudioSampleRate,MediaAudioExporter.CHANNELS,sc);
        mAudioTracksPaths.add(out.path);
        idxAudioTracks++;
      }
      mAudioTracksPaths.add(maOut.path);
      String finalAudioMix=maOut.path + "String_Node_Str";
      msg=mHandler.obtainMessage(0);
      msg.getData().putString("String_Node_Str","String_Node_Str");
      mHandler.sendMessage(msg);
      sxCon.combineMix(mAudioTracksPaths,finalAudioMix);
      if (!new File(finalAudioMix).exists()) {
        throw new Exception("String_Node_Str");
      }
      maOut.path=finalAudioMix;
    }
    MediaDesc mMerge=new MediaDesc();
    mMerge.path=new File(mFileProject,"String_Node_Str").getCanonicalPath();
    Double videoFadeLen=mFadeLen;
    for (int i=0; i < mMediaList.size(); i++) {
      MediaDesc media=mMediaList.get(i);
      if (media.duration == null) {
        media=ffmpegc.getInfo(media);
        media.duration=String.format(Locale.US,"String_Node_Str",Double.parseDouble(media.duration) - (videoFadeLen));
      }
 else {
        double newDuration=Double.parseDouble(media.duration) - (videoFadeLen);
        media.duration=String.format(Locale.US,"String_Node_Str",newDuration);
      }
      Log.d(AppConstants.TAG,"String_Node_Str" + media.startTime + "String_Node_Str"+ media.duration);
    }
    msg=mHandler.obtainMessage(0);
    msg.getData().putString("String_Node_Str","String_Node_Str");
    mHandler.sendMessage(msg);
    ffmpegc.concatAndTrimFilesMP4Stream(mMediaList,mMerge,mPreconvertClipsToMP4,mUseCatCmd,sc);
    msg=mHandler.obtainMessage(0);
    msg.getData().putString("String_Node_Str","String_Node_Str");
    mHandler.sendMessage(msg);
    ffmpegc.combineAudioAndVideo(mMerge,maOut,mOut,sc);
    msg=mHandler.obtainMessage(0);
    mHandler.sendMessage(msg);
    File fileTest=new File(mOut.path);
    if (fileTest.exists() && fileTest.length() > 0) {
      MediaScannerConnection.scanFile(mContext,new String[]{mOut.path},new String[]{mOut.mimeType},new OnScanCompletedListener(){
        @Override public void onScanCompleted(        String path,        Uri uri){
          Message msg=mHandler.obtainMessage(4);
          msg.getData().putString("String_Node_Str",mOut.path);
          mHandler.sendMessage(msg);
        }
      }
);
    }
 else {
      msg=mHandler.obtainMessage(0);
      msg.getData().putString("String_Node_Str","String_Node_Str");
      mHandler.sendMessage(msg);
    }
  }
 catch (  Exception e) {
    Message msg=mHandler.obtainMessage(0);
    msg.getData().putString("String_Node_Str","String_Node_Str" + e.getMessage());
    mHandler.sendMessage(msg);
    Log.e(AppConstants.TAG,"String_Node_Str",e);
  }
}

Fixed version (ground truth):
public void export(){
  try {
    ffmpegc=new FfmpegController(mContext,mFileProject);
    maOut=new MediaDesc();
    maOut.path=new File(mFileProject,"String_Node_Str").getCanonicalPath();
    Message msg=mHandler.obtainMessage(0);
    msg.getData().putString("String_Node_Str","String_Node_Str");
    mHandler.sendMessage(msg);
    maExport=new MediaAudioExporter(mContext,mHandler,mMediaList,mFileProject,maOut);
    maExport.setFadeLength(mFadeLen);
    maExport.export();
    SoxController sxCon=new SoxController(mContext,sc);
    if (mAudioTracks.size() > 0) {
      ArrayList<String> mAudioTracksPaths=new ArrayList<String>();
      int idxAudioTracks=0;
      for (      MediaDesc audioTrack : mAudioTracks) {
        msg=mHandler.obtainMessage(0);
        msg.getData().putString("String_Node_Str","String_Node_Str" + (idxAudioTracks + 1) + "String_Node_Str"+ mAudioTracks.size());
        mHandler.sendMessage(msg);
        File fileAudioTrack=new File(mFileProject,idxAudioTracks + "String_Node_Str");
        MediaDesc out=ffmpegc.convertToWaveAudio(audioTrack,fileAudioTrack.getCanonicalPath(),mAudioSampleRate,MediaAudioExporter.CHANNELS,sc);
        mAudioTracksPaths.add(out.path);
        idxAudioTracks++;
      }
      mAudioTracksPaths.add(maOut.path);
      String finalAudioMix=maOut.path + "String_Node_Str";
      msg=mHandler.obtainMessage(0);
      msg.getData().putString("String_Node_Str","String_Node_Str");
      mHandler.sendMessage(msg);
      sxCon.combineMix(mAudioTracksPaths,finalAudioMix);
      if (!new File(finalAudioMix).exists()) {
        throw new Exception("String_Node_Str");
      }
      maOut.path=finalAudioMix;
    }
    MediaDesc mMerge=new MediaDesc();
    mMerge.path=new File(mFileProject,"String_Node_Str").getCanonicalPath();
    float videoFadeLen=mFadeLen;
    for (int i=0; i < mMediaList.size(); i++) {
      MediaDesc media=mMediaList.get(i);
      if (media.duration == null) {
        media=ffmpegc.getInfo(media);
        media.duration=String.format(Locale.US,"String_Node_Str",Float.parseFloat(media.duration) - (videoFadeLen));
      }
 else {
        float newDuration=Float.parseFloat(media.duration) - (videoFadeLen);
        media.duration=String.format(Locale.US,"String_Node_Str",newDuration);
      }
      Log.d(AppConstants.TAG,"String_Node_Str" + media.startTime + "String_Node_Str"+ media.duration);
    }
    msg=mHandler.obtainMessage(0);
    msg.getData().putString("String_Node_Str","String_Node_Str");
    mHandler.sendMessage(msg);
    ffmpegc.concatAndTrimFilesMP4Stream(mMediaList,mMerge,mPreconvertClipsToMP4,mUseCatCmd,sc);
    msg=mHandler.obtainMessage(0);
    msg.getData().putString("String_Node_Str","String_Node_Str");
    mHandler.sendMessage(msg);
    ffmpegc.combineAudioAndVideo(mMerge,maOut,mOut,sc);
    msg=mHandler.obtainMessage(0);
    mHandler.sendMessage(msg);
    File fileTest=new File(mOut.path);
    if (fileTest.exists() && fileTest.length() > 0) {
      MediaScannerConnection.scanFile(mContext,new String[]{mOut.path},new String[]{mOut.mimeType},new OnScanCompletedListener(){
        @Override public void onScanCompleted(        String path,        Uri uri){
          Message msg=mHandler.obtainMessage(4);
          msg.getData().putString("String_Node_Str",mOut.path);
          mHandler.sendMessage(msg);
        }
      }
);
    }
 else {
      msg=mHandler.obtainMessage(0);
      msg.getData().putString("String_Node_Str","String_Node_Str");
      mHandler.sendMessage(msg);
    }
  }
 catch (  Exception e) {
    Message msg=mHandler.obtainMessage(0);
    msg.getData().putString("String_Node_Str","String_Node_Str" + e.getMessage());
    mHandler.sendMessage(msg);
    Log.e(AppConstants.TAG,"String_Node_Str",e);
  }
}