Well, then this is the case: I don't have any codec defined for YV12... what then?, what can I do to define a codec?.
I'm sorry this thread it's growing too much for a matter that I'm afraid it is not of general interest, but I cannot sort this out on my own. With your help I'm understanding (or not) better what happens (or doesn't) in my system. But still need some help else...

You can create if yourself in the registry.
Look at how are the entry vidc.YUY2 for instance, and create a new one for vidc.YV12 that point to "xvidvfw.dll"

Note: I wonder if, when you install XVID, the vfw module is optional or not. Did you check it at the intallation of xvid codec (koepie's release) ?

Related to your first suggestion: I already had thought to do that, but as my system has not complaint til now of a YV12 decoder missing, I thought it would be useless, as it seems it doesn't need an entry for vidc.YV12. But I may try and see what happens: if doesn't work, just erase the registry entry.

Related to your note: I "re-installed" (aborted when asked if ready for instal) XviD, and there's no VFW option: it seems it's installed by default...
But...
Playing with XviD "Configure Decoder" I saw a combobox named Output Colourspace, I had "No force" selected, and I changed to "YV12"... I don't know if this will help. I'll see, if not, I'll try to add a new entry in registry. I'll post my results.

Thanx

I suggest you try the Helix YV12 codec as the decoder.

http://forum.doom9.org/showthread.ph...ght=helix+yv12

Both XviD and DivX have sometimes problems when you crop the image - even if it's cropped by the rules, Helix has worked well. You only need to install the package, it then decodes YV12 by default.