<div dir="ltr">I think you are testing with asm code enabled. Assembly code has it's own table, it nothing to do with <font color="#000000" face="arial, helvetica, sans-serif" style="font-size:13px">constant '<span style="line-height:16.799999237060547px">g_t8'</span></font><span style="font-family:arial,sans-serif;font-size:13px"> at source/Lib/TLibCommon/TComRom.</span><span style="font-family:arial,sans-serif;font-size:13px">cpp (only for C code). Check dct8.asm file for asm tables.</span><div>
<span style="font-family:arial,sans-serif;font-size:13px"><br></span></div><div><span style="font-family:arial,sans-serif;font-size:13px"><br></span></div><div><span style="font-family:arial,sans-serif;font-size:13px">Regards,</span></div>
<div><span style="font-family:arial,sans-serif;font-size:13px">Praveen Tiwari</span></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, May 28, 2014 at 5:15 AM, Paulo André Oliveira <span dir="ltr"><<a href="mailto:oliveirapaulo@globo.com" target="_blank">oliveirapaulo@globo.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Dear x265 development team,<div><br></div><div>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 <font color="#000000" face="arial, helvetica, sans-serif">the constant '<span style="line-height:16.799999237060547px">g_t8'</span></font> at source/Lib/TLibCommon/TComRom.cpp</div>

<div><br></div><div>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 <span style="color:rgb(0,0,0);font-family:arial,helvetica,sans-serif">'</span><span style="color:rgb(0,0,0);font-family:arial,helvetica,sans-serif;line-height:16.799999237060547px">g_t8'. I am using the last version of x265 as of today.</span></div>

<div><br></div><div>Sincerely,</div><div><br></div><div>Paulo Oliveira</div></div>
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<br></blockquote></div><br></div>