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

[john sisi]

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?
Thanks,

John

On Mon, Jun 14, 2010 at 1:34 AM, Jason Garrett-Glaser
<darkshikari at gmail.com> wrote:
> On Mon, Jun 14, 2010 at 12:57 AM, john sisi <sisi.john1 at gmail.com> wrote:
>> Unfortunately, I cannot use the latest version of x264 since I have
>> already implemented a lot of extra functions in the old version. I
>> would be grateful if you could tell me the role or the function of
>> "--tune psnr". What is the goal in using such an option? Thanks,
>>
>> John
>>
>
> It disables psy optimizations, thus making PSNR slightly less
> meaningless as a measurement tool.  Check the code to see what it
> does.
>
> Dark Shikari
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