[XviD-devel] Re:find a problem

Christoph Lampert chl at math.uni-bonn.de
Sat Oct 23 11:51:32 CEST 2004


okay, now I might have found your problem. 
Do your pink line/point look in any way like the attached JPEG image? 
Did you decode the file with a different codec then XviD, e.g. DivX or 
ffmpeg? And does the pink completely disappear at the next I-frame? 

Then you have found one of the biggest (but known) problems of MPEG-4: 
encoder/decoder iDCT mismatch. 

Depending on which decoder you use, rounding errors can appear, and in 
some sequences, they become more and more visible. Normally, this doesn't 
happen when the decoder and the encoder are from the same codec, but here 
it seems it did. We'll have to analyze the reasons, thank you for your 


On Sat, 23 Oct 2004, ??? wrote:
> dear Lampert:
>      I encoder bridge-far.cif with program xvid_encraw,use windows xp,the command line is following:
> -single -bitrate 393216  -w 352 -h 288   -i  E:\bridge-far.cif  -o  enbridge-far2l.cif.
> and I send my total encoded 270 frame to your private e_mail,do you see
> the pink line and pink point are more and more obviously when more close
> to the second I frame.Sorry for my poor english and sometimes spelling
> mistake. thanks for your help! xiongshu,deng

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