ɔːlðˈoʊ ðə fˈaɪlz hæv dˈɪfɹənt hˈɛdɚz ðɛɹ ɐ slˈæʃ vˈiː pˈeɪloʊd kæn ˈɔfən biː ðə sˈeɪm sˈiː ˈaɪ tˈuːnz ɛksˈɛpʃən bᵻlˈoʊ.
Although the files have different headers their a/v payload can often be the same (see iTunes exception below).