mdhd: Media Header Box]
                            position = 284
                            size = 32
                            version = 0
                            flags = 0x000000
                            creation_time = UTC 2014/12/12, 18:41:19
                            modification_time = UTC 2014/12/12, 18:41:19
                            timescale = 48000
                            duration = 34560 (00:00:00.720)
                            language = und
                            pre