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// Searches 4pixel to the left and right, in both the old
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// and new fields, but takes half pel averages. These are even
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// pixel addresses. Chroma match will be used. (YUY2)
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MERGE4PIXavgH(edi-8, edi+ecx-8, esi+ecx+8, esi+2*ecx+8) // up left, down right
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MERGE4PIXavgH(edi+8, edi+ecx+8, esi+ecx-8, esi+2*ecx-8) // up right, down left
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MERGE4PIXavgH(edi+2*ecx-8, edi+ecx-8, esi+ecx+8, esi+8) // down left, up right
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MERGE4PIXavgH(edi+2*ecx+8, edi+ecx+8, esi+ecx-8, esi-8) // down right, up left