Problem: color space conversion by DirectShow

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I have the following problem:
 
I have AVI files in YUY2 color space. Problem is if I want to play or encode these files directsdhow always changes the color space to YV12
or RGB32 (on the other machine).
 
I want to keep it in YUY2.
 
Here is the directshow graph:
 
 
Any ideas ?