[M4IF Technotes] Question MPEG-2 vs MPEG-4.

[Alejandro RAMIREZ]

Hi,
I am confronted with the following problem:
I must implement a coder MPEG-4 starting from a coder MPEG-2. I have the 
source code of the coder MPEG-2. Initially I would have liked to know if 
that were possible.
In the second time, if that is possible, the reasoning below is it correct?  
I thought to change VLC part of coder MPEG-2 by VLC part of the coder MPEG-4 
who is specified in the standard 14496-2(version paper) and also to implant 
the headings specified inside. And to keep the DCT, the quantification, the 
RL, the movement estimation, and the rate control(TM5) by the coder MPEG-2 
which I have already.
The reasoning is it good? or requires it more work?
Is this better to start from a coder MPEG-4 directly because the differences 
between coder MPEG-2 and MPEG-4 are too significant?
Thank you for your answers,
Alejandro
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