Problem with VirtualDubMod & YV12 color [URGENT]

[Seimour]

Since I tried to code Matrix Reloaded, when I tried to open the avisynth project made with GKnot in VirtualDubMod or make a preview of the video with W. Media player (always) appeared the following error:
"Couldn't locate decompressor for format 'YV12' (unknown). VirtualDub requires a Video for Windows compatible codec to decompress video. DirectShow codecs, such as those used by windows media player aren't suitable. Only direct stream copy is available for this video"

So I couldn't/can't process the video neither compress it. What should I do?
1) Download the latest version of Windows Media Player?
2) Download a pack of codecs that can decompress this format 'YV12'?
3) Re-install windows???? - because this is the first time that appears this message and with other movies I coded before without no problem, now reports me that error - 'not found a codec for YV12'
4) Could it come because I recently uninstalled TMPEG-encoder, and perhaps, somehow mpeg codec dissapeared misteriously o_O?

Thanks go to everybody that can solve this ENORMOUS problem :eek:

[JuanC]

Installing DivX 5.x will probably solve your problem. Take a look at the second paragraph of answer to question #4 in the YV12 FAQ at the Avisynth's usage forum (http://forum.doom9.org/showthread.php?s=&threadid=37276)

[Seimour]

I tried first installing the latest version of Win.Media, 9, but it
only took about 25MB of HD space and didn't solve the problem. This morning I remembered your tip and tried installing divx, then.. Problem solved, it's like magic :D
Now I can make previews with GKnot and avisynth projects are opened correctly in VirtualDubMod. I never thought how neccesarily could be divxnetworks codec. :cool:

Bye and a lot of thanks!!