Moov Atom

[Maniac]

You can also verify it yourself by using AtomicParsley:

AtomicParsley.exe Test.mp4 -T

And it should show on the second line right after the "ftyp" atom:

E:\Test>AtomicParsley.exe Test.mp4 -T
Atom ftyp @ 0 of size: 24, ends @ 24
Atom moov @ 24 of size: 1127899, ends @ 1127923
    Atom mvhd @ 32 of size: 108, ends @ 140
    Atom iods @ 140 of size: 21, ends @ 161
    Atom trak @ 161 of size: 358098, ends @ 358259
        Atom tkhd @ 169 of size: 92, ends @ 261
....