MPEG4 artefacts

[Lupus]

Does anyone know why (at least) DivX (all) and standard MPEG4 produces quite often these strange blocks into still white texts?

Here's a sample (resized larger):
http://www.palmen3d.com/test.gif

You can see the artefact clearly in the capitalized "T". This was done by DivX 5.11, but same happened with Microsoft MPEG4 codec, and I can recall it from quite a lot of movies (encoded with earlier DivX versions). This does not happen with MPEG1 or WM9.

I'm just trying to make my own end titles to my 3d animations, but this blocking is quite annoying...

Here's the full video:
muzzleflash.avi (http://www.palmen3d.com/muzzleflash.avi)

[Manao]

I can't reproduce the artifact on the video you linked, I'm playing back with ffdshow.

[manono]

Hi-

No artifacts here, either. Also using ffdshow.

[temporance]

Looks like a postprocessing bug to me.

[Lupus]

I disabled the post processing, and the artefact disappeared. Post processing was definitely the problem...

[Sharktooth]

using 5.1.1 beta1 decoder doesnt show the problem.
5.1.1 final should be buggy.

[DigitAl56K]

We're looking into this issue guys, its related to the de-blocking in 5.1.1.

[Fr4nz]

Same bug here!! Look @ my thread: http://forum.doom9.org/showthread.php?s=&threadid=66226

[Dallemon]

i get those artifacts all over the place if a file that is coded in xvid is using DX50 4CC (i disabled divx's "support generic mpeg-4" but divx still wants to decode the files (the only way i can fix it is changing the 4CC to XVID)), i tried the sample file and it did help setting deblocking to minimum, but the deblocking artifacts dont show in any of my divx encoded ogm files... (when deblocking is set to max)