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Old 26th April 2007, 06:10   #32  |  Link
Manao
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Join Date: Jan 2002
Location: France
Posts: 2,856
A motion vector goes from -2^x to 2^x - 1/2 ( or 1/4 for QPel ), so yes, -64 is valid ( in your case, -64 is -16 integer pixels, and 63 is 15.75 integer pel ).
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