String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/SelfieLightCamera/";
    File dir = new File(path);
    if (!dir.exists())
        dir.mkdirs();
    String myFile = path + "Video_" + System.currentTimeMillis() + ".mp4";
    mediaRecorder = new MediaRecorder();
    mCamera.unlock();
    mediaRecorder.setCamera(mCamera);
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
    mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
    mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
    mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
    mediaRecorder.setOutputFile(myFile);
    try {
        mediaRecorder.prepare();
    } catch (IllegalStateException e) {
        releaseMediaRecorder();
        e.printStackTrace();
    } catch (IOException e) {
        releaseMediaRecorder();
        e.printStackTrace();
    }
    mediaRecorder.start();