the android app block when i call mediarecorder.stop

i use MediaRecorder as Google API provides(http://ift.tt/1j37gpT）,it run well.but i have to put the video to the server real time. so i use LocalSocket instead of the file path. First i define the LocalSocket

LocalServerSocket lss;
LocalSocket receiver;
LocalSocket sender;

and init the LocalSocket on the function of onCreate:

private void initLocalSocket() {
    receiver = new LocalSocket();
    try {
        lss = new LocalServerSocket("H264");
        receiver.connect(new LocalSocketAddress("H264"));
        receiver.setReceiveBufferSize(500000);
        receiver.setSendBufferSize(500000);
        sender = lss.accept();
        sender.setReceiveBufferSize(500000);
        sender.setSendBufferSize(500000);
    } catch (IOException e1) {
        e1.printStackTrace();
        Log.e("", "localSocket error:" + e1.getMessage());
    }
}

and replace the setOutputFile:

mMediaRecorder.setOutputFile(sender.getFileDescriptor());

then start the thread to charge of the data after setOutputFile:

new Thread(new Runnable() {

        @Override
        public void run() {
            // TODO Auto-generated method stub
            try {
                @SuppressWarnings("resource")
                Socket socket=new Socket(IP_ADDR,PORT);
                InputStream is=receiver.getInputStream();
                byte[]buffer=new byte[500000];
                OutputStream os=socket.getOutputStream();
                int length=0;
                while(true)
                {
                    length=is.read(buffer);
                    os.write(buffer);

                }
            } catch (UnknownHostException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }).start();

then problem comes when i stop the recoding, it blocks, gives me nothing. I put it to the new thread and even the try, but it doesn't give me any Exception error(i try the RuntimeException, IOException), this is the code:

new Thread(new Runnable() {

        @Override
        public void run() {
            // TODO Auto-generated method stub
            try {
                Log.d(TAG,"i will stop the media recorder");
                mMediaRecorder.stop();
                Log.d(TAG,"i will release the media recorder");
                releaseMediaRecorder(); 
                Log.d(TAG,"release media recorder successful");
                mCamera.lock(); 
            } catch (RuntimeException e) {
                // TODO: handle exception
                e.printStackTrace();
            } 
        }
    }).start();

i can just see the logcat "i will stop the media recorder" and then stop, it doesn't throw any exception.