[M4IF Technotes] 1MV/4MV comparisons

[Jwalant Desai]

Hi all,
Does anyone have statistical data on how much PSNR improvement (for the
same target bitrate) can be achieved if we use 4 MV instead of 1MV in
MPEG-4 simple profile encoding? I am looking for data such as:
1. All macroblocks encoded with 1 MV : xxx dB PSNR
2. All macroblocks encoded with 4 MV : yyy dB PSNR
3. Encoding with dynamic switch between 1 MV and 4 MV (based on
complexity of the macroblock) : zzz dB PSNR
It is assumed that all other parameters are same. 
In case statistical data is not available, any other qualitative
comments are also welcome. My related question is: Under what situation,
is it better to implement 4 MV as compared to 1 MV?
Best regards
Jwalant
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