Calibrated Software MP4-EX Import v3 - Manual (Page 15)

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Switching to MooV has a few advantages in Final Cut Pro. For MP4 files with a TypeCode of MooV you can apply the
SmoothCam Filter as well as perform certain Media Management features.
IMPORTANT for FCP: In Final Cut Pro
– certain Media Management functions will not work properly if the typecode of a
MP4 file is not ‘MooV’. In those cases where the typecode of a MP4 file is NOT set to ‘MooV’, then if you perform any
Media Management in FCP
– the MP4 files are simply copied by FCP instead of FCP rewrapping the MP4 files into a
MOV file.
The Auto-Change TypeCode feature only works if the MP4 file is unlocked and stored on writeable storage (for example, if
the hard-disk drive that the MP4 file is stored on is non-writeable, the Auto-Change TypeCode will not work).
If the MP4 file is locked, but on writeable storage, you can check the Unlock/Relock LOCKED Files option. This will
unlock a LOCKED MP4 file thereby letting the TypeCode to be changed and then the MP4 will be relocked. (see Chapter
5: Use with Mac OSX Applications for more details)