I don't know the frame size of your source but presumably it's not mod4. I'm guessing it's mod2 which will fail without cropping, and with cropping 8 lines. You must leave a mod4 frame height after cropping. Also, you should always crop interlaced YV12 by mod4 at the top.
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Out of curiosity: Why not simply crop after instead of before the deinterlacing?users currently on my ignore list: deadrats, Stears555