[x264-devel] Thresholds about slicetype_decide

[kenter]

This result is disappointing, however, I still thanks for your kindly
help on this issue!

2010/5/20, Jason Garrett-Glaser <darkshikari at gmail.com>:
> On Wed, May 19, 2010 at 1:52 AM, kenter <kenter83 at gmail.com> wrote:
>> I find there is a bug in my hack, after bug fixing, the PSNR is
>> 34.877dB(vs 34.855dB of 8x8 ME version)
>>
>> However, I still have some questions:
>> 1. There is only 0.022dB PSNR gain for slicetype_decide by 16x16 vs
>> 8x8 lowres one, Is it reasonable?
>
> Yes, this sounds reasonable.
>
>> 2. The return value of x264_slicetype_mb_cost must be divided by 4
>> (i_bcost/4), otherwise, there is a 0.5dB PSNR drop, I think it doesn't
>> make sense only if there are some parameters/thresholds related to
>> 8x8, can you help me to find out these parameters/thresholds?
>
> Don't know off the top of my head, but dividing by 4 is fine; you
> don't lose much precision.
>
> Dark Shikari
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