[M4IF Technotes] Where is the specification for...

[Stage NexVision]

Hi guys,
   I'm trying to understand what is in the "mdat" atom, and concerning video
information or audio information, I've found the corresponding specification
However, I have some data (of 0x0A length) that are pointed by an trak
definition containing the corresponding descriptor (in esds atom) that is of
type "Object descriptor = 1 (Scene); and Stream Type = 3 (Scene)"
In the mdat atom, the corresponding data are
C0 11 A4 CD 54 11 40 3D 04 C0
I cannot recognize what type it is (not an object descriptor, or neither an
atom)
If you know how to understand these bytes, please tell me.
Thank you.