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<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Dear Mahesh,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>you should have read
paragraph 7.4.5 more precisely. It somewhere says:</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><i><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;font-style:italic'>The macroblock types for P and SP
slices are specified in </span></font></i><i><span
lang=EN-GB style='font-style:italic'>Table 7‑13</span></i><i><span
style='font-style:italic'> <b><span lang=EN-GB style='font-weight:bold'>and </span></b></span></i><b><i><span
lang=EN-GB style='font-weight:bold;font-style:italic'>Table 7‑11</span></i></b><i><span
lang=EN-GB style='font-style:italic'>. mb_type values 0 to 4 are specified
in </span></i><i><span
lang=EN-GB style='font-style:italic'>Table 7‑13</span></i><i><span
lang=EN-GB style='font-style:italic'> and <b><span style='font-weight:bold'>mb_type
values 5 to 30</span></b> are specified in </span></i><i><span
lang=EN-GB style='font-style:italic'>Table 7‑11</span></i><i><span
lang=EN-GB style='font-style:italic'>, indexed by subtracting 5 from the value
of mb_type.</span></i></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>This should answer: </span></font></p>
<p class=MsoNormal><font size=3 color="#3333ff" face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt;color:#3333FF'>mb_type should be 0 to 4 as
in the <b><span style='font-weight:bold'>table 7.13 Macroblock type values o to
4 for P and SP slices . </span></b>So how can i check for mb_type 5.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>---------------------</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>It seems you only have
implemented a very rudimental version of H.264 yet. Don’t expect any encoder to
obey these constraints. You will have to modify the JM-encoder code in a way
that the Intra predictor function always returns a very high value so that it
will never be choosen. </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>This reflector is not the
right place to discuss this though, since as far as I know, we are NOT talking
about the JM here</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Regards</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Peter</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
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style='font-size:10.0pt;font-family:Arial;color:green'> </span></font></p>
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<p class=MsoNormal><span class=gmailquote><font size=3 face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt'>On 8/7/07, <b><span style='font-weight:
bold'>List, Peter</span></b> <</span><a
href="mailto:Peter.List@t-systems.com"><span lang=EN-GB>Peter.List@t-systems.com</span></a></font></span><span
class=gmailquote><span lang=EN-GB>> wrote:</span></span></p>
<div link=blue vlink=blue>
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<p><font size=2 color=navy face=Arial><span lang=EN-GB style='font-size:10.0pt;
font-family:Arial;color:navy'> </span></font></p>
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<p><b><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
font-weight:bold'>Von:</span></font></b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'> mahesh k [mailto:<a
href="mailto:maheswarreddy.k@gmail.com" target="_blank">maheswarreddy.k@gmail.com</a>]
<br>
<b><span style='font-weight:bold'>Gesendet:</span></b> Dienstag, 7. August 2007
14:24<br>
<span class=q><b><span style='font-weight:bold'>An:</span></b> Mailing list for x264 developers</span><br>
<span class=q><b><span style='font-weight:bold'>Betreff:</span></b> Re:
[x264-devel] Regarding disabling 4x4 in JM code</span></span></font></p>
</div>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p style='margin-bottom:12.0pt'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Dear peter,<br>
I am talking about decoder only. I will explain u my problem more clearly.<br>
<br>
Right now our decoder works properly with our encoder. Now we need to make this
decoder standardised in the sense that it should accept any other bitstream(for
example i want to decode JM encoders output with my decoder). <br>
<br>
</span></font><span lang=EN-GB>After reading the syntax elements as per
baseline standard I need to check whether this is implemented or not in my
decoder and return the error still needs to be implemented. the intent was that
the code shouldnot crash in such situations instead return proper error code. </span></p>
<p style='margin-bottom:12.0pt'><font size=2 color=red face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:red'>Obviously you
will need to decode the COMPLETE mb_type than. For values of '0' in
Intra-frames and values of '5' in P-Frames and '23' in B-Frames you produce
your error message. </span></font></p>
<p style='margin-bottom:12.0pt'><font size=3 color="#3333ff"
face="Times New Roman"><span lang=EN-GB style='font-size:12.0pt;color:#3333FF'>For
I frames if it is o then I will display error but for P frames (slices)
thee mb_type should be 0 to 4 as in the <b><span style='font-weight:bold'>table
7.13 Macroblock type values o to 4 for P and SP slices . </span></b>So how can
i check for mb_type 5. This is as per my knowledge IF i am wrong plz tell me. </span></font></p>
</div>
</div>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
<font color="#3333ff"><span style='color:#3333FF'>Also we didnot
implement macroblock partitions plz tell me how to handle this
situation in case of P frames.</span></font> </span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
<font color="#3333ff"><span style='color:#3333FF'>Also plz tell ma how I can
generate the encoded bitstream through JM encoder code. So that I can test my
decoder with this bitstream. I disabled 4x4 but then also its encoding
intra4x4_prediction mode.</span></font><br>
<font color="#3333ff"><span style='color:#3333FF'>I understtod ur remaining
answers clearly and I thank for that.</span></font></span></font></p>
<div link=blue vlink=blue>
<div>
<div style='border:none;border-left:solid windowtext 1.5pt;padding:0cm 0cm 0cm 4.0pt;
border-color:-moz-use-text-color -moz-use-text-color -moz-use-text-color blue'>
<p style='margin-bottom:12.0pt'><font size=3 face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt'>I went through the section that u told me. </span>But
my doubts were,<br>
i dont understand what 0_0_0 signify in name of MB type. </font></p>
<p style='margin-bottom:12.0pt'><font size=2 color=red face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:red'>The 1. number
in x_x_x corresponds to column 5 of table 7-11</span></font><span
lang=EN-GB> </span></p>
<p style='margin-bottom:12.0pt'><font size=2 color=red face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:red'>The 2.
number….
column 6</span></font></p>
<p style='margin-bottom:12.0pt'><font size=2 color=red face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:red'>The 3.
number
column 7</span></font></p>
<p style='margin-bottom:12.0pt'><font size=2 color=red face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:red'>Search for the
label-text of these table-columns to get their exact meaning </span></font></p>
<p style='margin-bottom:12.0pt'><font size=2 color=red face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:red'> </span></font></p>
<p style='margin-bottom:12.0pt'><font size=3 face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt'>Also in table 7.13 mb_types for P slices,
what do we mean by inferred type.</span></font></p>
<p style='margin-bottom:12.0pt'><i><font size=2 color=red face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:red;font-style:italic'>Inferred</span></font></i><font
size=2 color=red face=Arial><span lang=EN-GB style='font-size:10.0pt;
font-family:Arial;color:red'> </span></font><font size=2 color=red face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:red'>means <i><span
style='font-style:italic'>deduced</span></i>. I simply says: if a macroblock
does not appeare in the bitstream (because it is skipped due to 'mb_skip_run'
it automatically has the type P_Skip and is 16x16 ….</span></font></p>
<p style='margin-bottom:12.0pt'><font size=3 face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt'><br>
<span class=q>Also tell me can we idetify the prediction mode from mb_type
itself? </span><br>
</span></font><font size=2 color=red face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:red'>Yes, every possible mode is
part of the tables! Somewere in 7.4.5 you find the note that you have to add
the I-Table at the bottom of the P and B tables, to signal Intra MB's in P and
B-frames. </span></font></p>
<div><span id="q_1144064dcc7b5426_11">
<p style='margin-bottom:12.0pt'><font size=2 color=red face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;color:red'> </span></font></p>
<p style='margin-bottom:12.0pt'><font size=3 face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt'><br>
</span>thanks in advance,<br>
mahesh.</font></p>
<div>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>On
8/7/07, <b><span style='font-weight:bold'>List, Peter</span></b> <<a
href="mailto:Peter.List@t-systems.com" target="_blank">Peter.List@t-systems.com</a>>
wrote: </span></font></p>
<div link=blue vlink=blue>
<div>
<p><font size=2 color=navy face=Arial><span lang=EN-GB style='font-size:10.0pt;
font-family:Arial;color:navy'>Dear Mahesh,</span></font></p>
<p><font size=2 color=navy face=Arial><span lang=EN-GB style='font-size:10.0pt;
font-family:Arial;color:navy'>if you are talking about a DECODER intra 4x4 is a
must, if you want to be standard conform in all cases (for any profile). </span></font></p>
<p><font size=2 color=navy face=Arial><span lang=EN-GB style='font-size:10.0pt;
font-family:Arial;color:navy'>If you are talking about ENCODERS you don't
need to implement intra-4x4 but only use intra-16x16 (resulting in very poor
intra performance).</span></font></p>
<p><font size=2 color=navy face=Arial><span lang=EN-GB style='font-size:10.0pt;
font-family:Arial;color:navy'> </span></font></p>
<p><font size=2 color=navy face=Arial><span lang=EN-GB style='font-size:10.0pt;
font-family:Arial;color:navy'>I don't understand what you mean with:</span></font></p>
<p style='margin-bottom:12.0pt'><font size=3 face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt'>But we want to decode any standard
bitstream that is as per standard but return the error code accordingly . </span></font></p>
<p><font size=2 color=navy face=Arial><span lang=EN-GB style='font-size:10.0pt;
font-family:Arial;color:navy'>About mb_type read in "Recommendation
H.264" (ISO/IEC 14496-10) paragraph 7.4.5</span></font></p>
<p><font size=2 color=navy face=Arial><span lang=EN-GB style='font-size:10.0pt;
font-family:Arial;color:navy'> </span></font></p>
<p><font size=2 color=navy face=Arial><span lang=EN-GB style='font-size:10.0pt;
font-family:Arial;color:navy'>Peter</span></font></p>
<p><font size=2 color=navy face=Arial><span lang=EN-GB style='font-size:10.0pt;
font-family:Arial;color:navy'> </span></font></p>
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<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center>
</span></font></div>
<p><b><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
font-weight:bold'>Von:</span></font></b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'> mahesh k [mailto: <a
href="mailto:maheswarreddy.k@gmail.com" target="_blank">maheswarreddy.k@gmail.com</a>]
<br>
<b><span style='font-weight:bold'>Gesendet:</span></b> Dienstag, 7. August 2007
11:22<br>
<b><span style='font-weight:bold'>An:</span></b> Mailing list for x264
developers<br>
<b><span style='font-weight:bold'>Betreff:</span></b> Re: [x264-devel]
Regarding disabling 4x4 in JM code</span></font></p>
</div>
<div>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p style='margin-bottom:12.0pt'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>thanks for ur reply. Plz tell me whether intra 4x4 is
must in base line profile or it is an optional.<br>
Can't we run the baseline profile decoder without 4x4 as per standard?<br>
I need this because at present we have not implemented this 4x4 mode But we
want to decode any standard bitstream that is as per standard but return the
error code accordingly . <br>
Also I am confused with the syntax element mb_type. <br>
What values does mb_type should have if i need to check whether this is an 4x4
or 16x16.<br>
Also plz tell me in clear about this mb_type and ma_mde.<br>
If possible refer some good document on this. <br>
<br>
Thanks in advance.</span></font></p>
<div>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>On
8/7/07, <b><span style='font-weight:bold'>List, Peter</span></b> <<a
href="mailto:Peter.List@t-systems.com" target="_blank">Peter.List@t-systems.com</a>>
wrote:</span></font></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'><br>
> mahesh k wrote:<br>
> > I want a baseline ecoded bit stream in which intra4x4 predition mode<br>
> > should not be present.<br>
><br>
> Note (but you probably already know it): of course intra4x4 is part of <br>
> baseline.<br>
<br>
Also note that intra4x4 is NOT some fancy add on for intra-coding like<br>
some people think 4x4 motion estimation is.<br>
Intra4x4 is the basic intra coding mode! It is usually used for the<br>
majority of intra-macroblocks. Intra-16x16 is only used for very uniform <br>
macroblocks like blocks from a blue sky or something like that.<br>
Regards, Peter<br>
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