[x264-devel] Re: about motion compensation
Loren Merritt
lorenm at u.washington.edu
Fri Dec 15 06:04:19 CET 2006
On Fri, 15 Dec 2006, ÕÅî£ wrote:
> in x264, the 3 half-pel planes are interpolated after encoding each frame,
> which is implemented in x264_frame_filter().
> but I don't understand why more 8 pixels are interpolated than origin image
> width, and I want to know if the 3 half-pel planes could be just
> inpterpolated without dealing with the 8 pixels.
> thanks!
Because the interpolation is a 6-tap filter, 5 extra pixels are needed (3
on the top & left, 2 on the bottom & right). The number is then rounded up
to the size of an MMX register.
--Loren Merritt
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