Quote:
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Originally Posted by Manao
h264 was planned initially with 1/8th pel motion compensation. It has been dropped ( except for the chroma ), because it lacked efficiency.
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<nitpicking>
IIRC for chroma in 4:2:0 it's not really "1/8th pixel", but "1/8th sample". That is, along every axis you compute 8 values from the original sample. Given that in 4:2:0 each chroma sample is taken every two pixels, then 2 / 8 = 0.25 and so interpolated chroma planes are effectively "1/4th pixel" in resolution like luma.
</nitpicking>
(hope I'm remembering things correctly
)