[M4IF Technotes] Doubts!!

[Gajanan]

Respected Sir(s),
     My name is Gajanan Lonkar & i m doing my Final Year Engg in E&TC from C.O.E.P(INDIA) which is one of the most reputed colleges in the country. I am doing a Final Year project at CIRRUS LOGIC titled "MPEG4  SYSTEM PARSER".Before jumping to MPEG4 we were asked to go through the MPEG1 & MPEG2 ISO Standards.We have been asked to find the answer to 2 questions but after much deliberation (and searching on the net) we were not able to come up with  a substantial solution . I would be highly obliged if u could throw some light on the matter.
 The questions are as follows:
1) Why DTS is Requires
    Please note : in our discussion with our guide we gave a few reasons as to DTS for decoding instant  and PTS for presentation instant but their argument was that we know the (I,P,B)picture order so we can decode them just by reordering. Is it related to BUFFER MANAGMENT?
2)What is VBV(Video Buffer Verifier)
 Where is it located,  What parmeters govern its operation.
Specifically the lower and higher threshold.
PS-We think its operation is somehow related to the DTS concept.
 I hope that u will spare some of ur valuable time and enlighten us regarding the above queries.
THANKING U IN ANTICIPATION
Your's Sincerely
Gajanan Lonkar
PS- PLease note that the quesions are generic in manner and can be related to any MPEG version.
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