[x265] x265: uncommon behavior by changing the 8-point DCT matrix

[Praveen Tiwari]

I think you are testing with asm code enabled. Assembly code has it's own
table, it nothing to do with constant 'g_t8' at
source/Lib/TLibCommon/TComRom.cpp (only for C code). Check dct8.asm file
for asm tables.


Regards,
Praveen Tiwari


On Wed, May 28, 2014 at 5:15 AM, Paulo André Oliveira <
oliveirapaulo at globo.com> wrote:

> Dear x265 development team,
>
> I am trying to conduct the following experiment: assess the change in the
> compressed video's quality by changing only the 8-point DCT matrix, which I
> suppose is the constant 'g_t8' at source/Lib/TLibCommon/TComRom.cpp
>
> However, the video's quality, which I am monitoring by the PSNR and SSIM
> metrics, keeps the same with any random matrix that I define in 'g_t8'. I
> am using the last version of x265 as of today.
>
> Sincerely,
>
> Paulo Oliveira
>
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> x265-devel at videolan.org
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>
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