/**
   * @param srcPath     string, filepath of source file
   * @param destPath    string, ouput filepath
   * @param outputWidth  pixels, output video width
   * @param outputHeight pixels, output video height
   * @param bitrate  int, in bits per second
   * @param listener  the listenr of convert progress
   */
  VideoSlimmer.convertVideo(srcPath, destPath, 200, 360, 200 * 360 * 30, new VideoSlimmer.ProgressListener() {
                        @Override
                        public void onStart() {
                           //convert start

                        }

                        @Override
                        public void onFinish(boolean result) {
                            //convert finish,result(true is success,false is fail)
                        }


                        @Override
                        public void onProgress(float percent) {
                           //percent of progress
                        }
                    });