[x264-devel] The size of search area in reference frames

[Jason Garrett-Glaser]

On Mon, Jun 14, 2010 at 9:50 PM, john sisi <sisi.john1 at gmail.com> wrote:
> You mentioned that x264 by default uses the maximum vector size
> allowed by the spec. I check these maximum limits in function
> x264_me_search_ref and it seems that these limits are -19 for both
> mv_x_min and mv_y_min and +250 for mv_x_max and mv_y_max. But why -19
> and 250? Why we don't use a symmetric interval like -128 and 128?

Because there's no reason to allow motion vectors that go more than 16
pixels off the frame.

Dark Shikari