Deinterlacing using Quicktime SDK

Hi
Im writing on a Quicktime (*.mov) player using Quicktime SDK rendering frames for Direct3D textures. I get these textures using
newTexture = (LPDIRECT3DTEXTURE9)QT::CVDirect3DTextureGetName((QT::CVDirect3DTextureRef)newC VImageRef)
Which uses
QT::OSStatus err = QT::QTVisualContextCopyImageForTime(d3dContext, NULL, NULL, &newCVImageRef)
to receive a CVImageRef for each frame.
This seems to be working fine. However now I would like to deinterlace this image, or at least scale it down to half size in Y do do a rough deinterlacing.
It seems that the deinterlace functionality provided by Quicktime is not available for the windows SDK (kQTSettingsDeinterlaceSource) and it also seems that I cant lock the direct3D texture I receive, which means that I cant manipulate that in any way.
So the question is, is there a way for me to deinterlace or maybe just scale the texture before I get it as a direct3D texture? Maybe using some function calls on the imageref or the direct3dcontext?
Does anyone have experience with deinterlacing using the Quicktime windows SDK?
Thanks!
Rasmus

Hello again
We figured out a way to access the texture, which made it possible for us to do a simple deinterlace by removing every second line of the output.
By converting to a surface we where able to copy data to a new surface which we could lock...
Probably not the fastest most elegant way - but it seems to work alright

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