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<DIV><FONT face=Arial size=2>Dear Experts,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I downloaded x264 source code from <FONT
face="Courier New" size=3><FONT face=Arial
size=2>git://git.videolan.org/x264.git and </FONT></FONT>built x264.exe in
Visual Studio. I set command line parameters as follows.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>-v --frames 300 -B 128 -o D:/output/foreman.264
D:/output/foreman_cif.yuv 352x288</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I observe that QP in the first I frame is very
high, resulting in poor quality. The output from the code is as
follows. </FONT><FONT face=Arial size=2> </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>x264 [debug]: level_idc: 13<BR>x264 [info]: using
cpu capabilities: MMX2 SSE2 SSE3 Cache64 Slow_mod4_stack<BR>x264 [debug]:
frame= 0 QP=50.99 NAL=3 Slice:I Poc:0 I:396
P:0 SKIP:0<BR>size=642 bytes PSNR Y:24.65 U:36.67 V:37.33 SSIM
Y:0.71029</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I guess default parameter settings are optimal.
Hence I am surprised why quality is so poor in first I frame.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>
<DIV><FONT face=Arial size=2>Can anyone let me know what goes wrong here ?
</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></DIV>
<DIV><FONT face=Arial size=2>Thanks and Regards,</FONT></DIV>
<DIV><FONT face=Arial size=2>Sandip</FONT></DIV><BR>
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