test1 : a 0x47 byte followed by three bytes
    expected result : MPEG-2-TS
test2 : two system headers, the first with 0 length, the second with a length
    of 1 and a space, then a MPEG-2-PS pack header with a 0x2? byte
    expected result : MPEG-1-PS
test3 : a pack header, with a 0x4? byte
    expected result : MPEG-2-PS
test4 : a 0x47 byte
    expected result : MPEG2-TS
test5 : 4 random byte
    expected result : raw PES, no headers
test6 : a pack header, with a 0x4? byte
    expected result : no autodetection

