[M4IF Technotes] Doubts!!

[gajanan lonkar]

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 grateful 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 algorithm. 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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