[M4IF Technotes] motion vector decoding help

[Baby Reeja Jayan]

Hello
I am currently trying to develop a MPEG-4 visual simple profile decoder. In
fact, i am using the ISO/IEC reference source code as my guidelines.
However, the source code is very difficult to follow, especially the part
about decoding of predicted (P) frames from the reference frames. I just
cannot decipher the code that says how the I frame along with the motion
vectors & texture coefficients of the P frame help in decoding the P frames.
There seems to be a lot of pixel based operations in this section of the
code which really looks intimidating :-(
I have seen  answers to several MPEG-4 related questions, posted in this
MPEG-4 discussion group .This gave me the idea to post my doubts here 
Can you please help me
Thanks for your time
Reeja
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