SMPTE RP 179-2002

This practice specifies a method of coding film position, film frame to video frame phase relationship, transfer sync points, and production related data into binary groups of SMPTE time and control code.
The dialect specified defines the structure of directory page-lines 0Ah to 0Fh (page 0, lines 10 through 15) 1Ah to 1Fh (page 1, lines 10 through 15), 2Fh (page 2, line 15), and D0h to EFh (pages 13 and 14, lines 0 through 15). This conforms to the multiplexing structure specified in SMPTE 262M.
The page-line directory index, located in binary groups 8 and 7 of each time code frame, fully specifies the type of data stored in the remaining binary groups of that frame.
The encoding method is suitable to both linear time code (LTC) and to vertical interval time code (VITC).