[Mp4-tech] [H.264]Doubt regarding search range

[hari prasath]

Dear Experts,
I have a three doubts..
1) In the JM reference Encoder,search range of 16 is used.Is there any
specific reason for it.What are the factors that decide the search  range in
motion estimation.
2)What is the difference between the energy measures Mean Square
Error(MSE),Mean Absolute Error(MAE) and Sum of Absolute differences(SAD or
SAE)?In the reference encoder,SAD is used.Why not MSE or MAE?
3)This is a general doubt.Is it possible to get the spatial information in a
frame from the temporal information in a video sequence i.e are the spatial
information and temporal information orthogonal?
Could anyone help me...
Thanks in advance...
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