$this->fieldspec['video_id']        = array('type' => 'string',
                                            'size' => 255,
                                            'subtype' => 'video',
                                            'preload' => 'y',
                                            'imageheight' => 360,
                                            'imagewidth' => 640,
                                            'control' => 'filepicker',
                                            'task_id' => 'video(filepicker)');