[XviD-devel] Re: qpel smearing/noise problem

[xvid-devel@xvid.org]

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>Hi

>On Thursday 09 January 2003 16:41, Michael Niedermayer wrote:
>> On Thursday 09 January 2003 16:13, Christoph Lampert wrote:
>> > On Thu, 9 Jan 2003, Michael Niedermayer wrote:
>> > The reference software is correct (well, in fact the standard has 
been
>> > modified to be in compliance with the software. That's a clever way
>> > of debugging: leave the software as it is, instead modify the specs. 
)
>>
>> ok, i believe u both, ill fix ffmpeg
>ok, done

>btw i allso reproduced the IDCT qpel difference problem 
>(see http://www.mplayerhq.hu/~michael/qpel-test.avi) for the video, its 
>encoded with qpel / simpleidct with different constant qpel vectors in 
>different areas of the image, it cant be decoded without artifacts with a 

>different IDCT, allthough its a unfair test as the constant pattern with 
>constant vectors will lead to a catastrophic accumulation of errors (if a 

>IDCT "error" ever happens in a block, then it will very likely happen 
over 
>and over again for the same block ...)
>
>[...]
>
>Michael

So... is it the problem I sent in XviD mailing list last October? 
([XviD-devel] Quarterpel problem.)

--
Jeanson Hung
BU2, ADMtek Inc. 
Phone: 03-5788879-521 

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<br>
<br>
<br><font size=2 face="Courier New">&gt;Hi<br>
<br>
&gt;On Thursday 09 January 2003 16:41, Michael Niedermayer wrote:<br>
&gt;&gt; On Thursday 09 January 2003 16:13, Christoph Lampert wrote:<br>
&gt;&gt; &gt; On Thu, 9 Jan 2003, Michael Niedermayer wrote:<br>
&gt;&gt; &gt; The reference software is correct (well, in fact the standard has been<br>
&gt;&gt; &gt; modified to be in compliance with the software. That's a clever way<br>
&gt;&gt; &gt; of debugging: leave the software as it is, instead modify the specs. )<br>
&gt;&gt;<br>
&gt;&gt; ok, i believe u both, ill fix ffmpeg<br>
&gt;ok, done<br>
<br>
&gt;btw i allso reproduced the IDCT qpel difference problem <br>
&gt;(see http://www.mplayerhq.hu/~michael/qpel-test.avi) for the video, its <br>
&gt;encoded with qpel / simpleidct with different constant qpel vectors in <br>
&gt;different areas of the image, it cant be decoded without artifacts with a <br>
&gt;different IDCT, allthough its a unfair test as the constant pattern with <br>
&gt;constant vectors will lead to a catastrophic accumulation of errors (if a <br>
&gt;IDCT &quot;error&quot; ever happens in a block, then it will very likely happen over <br>
&gt;and over again for the same block ...)<br>
&gt;<br>
&gt;[...]<br>
&gt;<br>
&gt;Michael</font>
<br>
<br><font size=2 face="Courier New">So... is it the problem I sent in XviD mailing list last October? </font>
<br><font size=2 face="Courier New">([XviD-devel] Quarterpel problem.)</font>
<br><font size=2 face="Courier New"><br>
</font><font size=2 face="sans-serif">--<br>
Jeanson Hung<br>
BU2, ADMtek Inc. <br>
Phone: 03-5788879-521 </font>
<br>
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