[M4IF Technotes] Chroma components in inter4v mode

[Christoph Lampert]

Hi,
as far as I see from the docs, in 4 motion vectors per MB mode, chroma
components are compensation using the average vector of the four
motion vectors.
Why was it chosen like that? It sound like that's exactly the wrong
position, because that might be wrong for _all_ of the four blocks. 
Also, it makes motion search much more difficult.
If would have been logical to either add a fifth vector, or 2 bits to 
signalize which of the blocks' vector to use, or something similar. 
Christoph 
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