Flipped Y41P colorspace

[fellaw]

I'm getting a flipped preview(and capture, too) when using the Y41P colorspace.

Hardware:
Athlon TB 1.3G
Terratec Cinergy 400(Philips SA7134 chipset)
KT133 chipset
Hercules 3D Prophet II Ultra
newest drivers, bios, firmware, etc.

Software:
WinXP Pro SP1
Graphedit
DirectX 8.2b/9.0a

I first used other WDM software, e.g. iuVCR. All had the same result. After that, I set up a simple capture graph with Graphedit: Only the WDM capture device and the Video Renderer. Even with that combo, I'm getting a flipped preview!

Does anyone know a solution for this?

This has to be solved, because Y41P is the only way(at least for me, no chance with YUY2) not to get dropped frames. Sure, I could flip the picture after capturing. But I want to see the video the right way while I'm capturing, so this is no option for me! VDub doesn't work, Terratec's WDM drivers are messing up with the wrapper.

[^^-+I4004+-^^]

UYVY!

[fellaw]

This exactly the problem. I can only use 5 colorspaces:

YUY2, RGB24, RGB32, Y41P & YUV9. Graphedit lets me choose from all possible(even I420), but neither iuVCR nor VirtualVCR!

YUY2: Dropped frames like hell(Don't know why, the system is fast enough)
RGB24/32: Black preview and capture. Doesn't matter, as I never will use RGB24/32.
YUV9: Very ugly. Lacerated edges and a very green color engraving.
Y41P: Perfect picture, imho even better than YUY2!

Y41P is the only way for me to capture with any glitches. Therefore it's very annoying to look at a flipped preview while capturing.