[XviD-devel] XviD-1.1-Beta 1 bugs summary

[nvidiadx at hushmail.com]

On Wed, 23 Feb 2005 23:49:30 -0800 Dirk Knop <dknop at stud.uni-
goettingen.de> wrote:
>Aloha!
>
>Michael Militzer wrote:
>
>>Hi,
>>
>>Quoting Dirk Knop <dknop at stud.uni-goettingen.de>:
>>
>>  
>>
>>>- GMC has a bug. With very much motion, some blocks get totally 
>>>displaced. The issue is the same no matter if decoded with 
>libavcodec or 
>>>xvid.
>>>    
>>>
>>
>>Do you have a sample demonstrating this effect? Either the coded 
>(wrong)
>>bitstream or a source file + settings to reproduce the problem?
>>  
>>
>
>Someone reporting this bug at doom9 posted an archive here: 
>http://s2.yousendit.com/d.aspx?id=1IRU00JPFMEFR26USGL9OUJOF1
>
>Don't know if it's still online, but it contains the source, the 
>avs 
>script and some broken encodes ;)
>
>>>- Some issue with cartoon mode and bvhq (well, cruncher may 
>report it 
>>>better :) ): some white blocks sometimes floating around within 
>high motion.
>>>    
>>>
>>
>>Is this really _only_ happening with bvhq? Iirc, the cartoon mode 
>doesn't add
>>any special optimizations for b-frames - in fact, it wasn't even 
>meant for
>>using it with b-frames (at least I didn't test it much). Do you 
>have a sample
>>clip for this problem? I suspect that probably some MBs are 
>skipped in 
>>b-frames, which shouldn't have been skipped - but you know, 
>cartoon mode
>>rather aggressively forces the use of skip mode...
>>  
>>
>This is a cruncher-report, he says he can always reproduce it. 
>Will ask 
>him to report more on it.
>
>Regards
>Koepi

Yes my initial thought was b-vop is couseing this behaviour in use 
with cartoon mode but that assumption was wrong it is cartoon mode 
+ adaptive quantization thats couseing it, other reports and 
samples showing that problem can be found @ the following places

http://forum.doom9.org/showthread.php?s=&threadid=90596
http://forum.doom9.org/showthread.php?s=&threadid=88367
http://cruncher.mufflastig.com/XviD/cartoonbug/

SCNR
CruNcher





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