[Mp4-tech] [H.264] [Q] SEI and AU.

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Dear Experts,
I have a question about Picture timing SEI message syntax.
What is the linkage information that ties timestamp to coded slice
information?
Does every coded slice follows the corresponding SEI message?
If there is additional information such as MPEG-4 SL layer or MPEG2 TS, 
is the timing SEI message useless? I wonder if MPEG2 TS does not deliver
the 'contents time informations', how to deliver them and reconstruct them.
I am thirsty of the information.
Thanks in advance.
regards,
Chulsoo Lee.