No subject

Fri Feb 15 00:41:25 CET 2008

constraints at high bit-rates. I would think we should have the same
issue. Activity functions worked pretty well to predict MB bit usage for
constant 8x8. Probably need to revisit that. Wondering if the JVT folks
did some study on that?

-- Pat.

=20

=20

-----Original Message-----
From: x264-devel-bounce at videolan.org
[mailto:x264-devel-bounce at videolan.org] On Behalf Of
shauli.rozen at gmail.com
Sent: Monday, January 02, 2006 1:34 AM
To: x264-devel at videolan.org
Subject: [x264-devel] Rate control mechanism

=20

Hi All.

=20

1)I looked at the rate control , and thought maybe to implement a MB
based QP selection.Any ideas on the

improvement I might get?

=20

2)I also looked in some academic papers regarding rate control and did
not see any one that seems to

co relate with the implemented mechanism.Does any of you know the paper
or mechanism on which the x264

rate control is based ? I would really like to read it.

=20

thanks.

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<div class=3DSection1>

From DVD versus Mpeg2 past, MB =
level was
required to satisfy VBV constraints at high bit-rates. I would think we =
should
have the same issue. Activity functions worked pretty well to predict MB =
bit
usage for constant 8x8. Probably need to revisit that. Wondering if the =
JVT
folks did some study on that?

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>-- Pat.</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original =
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b>
x264-devel-bounce at videolan.org [mailto:x264-devel-bounce at videolan.org] =
<b><span
style=3D'font-weight:bold'>On Behalf Of =
</span></b>shauli.rozen at gmail.com<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Monday, January 02, =
2006
1:34 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
x264-devel at videolan.org<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> [x264-devel] =
Rate control
mechanism</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>&nbsp;</span></font></p>

<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>Hi All.</span></font></p>

</div>

<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>&nbsp;</span></font></p>

</div>

<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>1)I looked at the rate control , and thought =
maybe to
implement a MB based QP selection.Any ideas on the</span></font></p>

</div>

<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>improvement I might get?</span></font></p>

</div>

<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>&nbsp;</span></font></p>

</div>

<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>2)I also looked in some academic papers =
regarding rate
control and did not see any one that seems to</span></font></p>

</div>

<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>co relate with the implemented mechanism.Does =
any of
you know the paper or mechanism on which the x264</span></font></p>

</div>

<div>

rate control is based ? I would really like =
to read
it.

</div>

<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>&nbsp;</span></font></p>

</div>

<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>thanks.</span></font></p>

</div>

</div>

</body>

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