[x264-devel] Thresholds about slicetype_decide

[kenter]

yes, the Intra prediction have been modified as 16x16 in
slicetype_decide, and the returned i_cost of slicetype_decide is also
divided by 4(I assume that SATD(16) = 4*SATD(8))

2010/5/19, Jason Garrett-Glaser <darkshikari at gmail.com>:
> On Tue, May 18, 2010 at 10:05 PM, kenter <kenter83 at gmail.com> wrote:
>> Thanks for Jason, I'm sorry that I forget to mention my modifications
>> are based on x264-snapshot-20090302-2245 for historical reasons, the
>> mb-tree and lookahead feature are not available.
>> I modulate the parameters based on your suggestions:
>> 1. Set QP=24 in x264_lowres_context_init()
>> 2. Change the data array type of *i_intra_cost from uint16_t to
>> uint32_t in x264_frame_t (It seems the lowres_cost and lowres_type are
>> not exist in my version)
>>
>> However, the result shows the PSNR also drops 0.5dB compares to that
>> of 8x8 slicetype_decide(from 34.84 to 34.35dB), can you point me other
>> values that I need to modify?
>
> You'll need to redesign intra analysis in lookahead if you want to use
> 16x16 blocks; currently it assumes 8x8 and uses 8x8 intra prediction
> accordingly.
>
> Dark Shikari
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