Field swap out of the blue ? caused by what ?

[Fudoh]

Hi,

I'm using Neatvideo's denoiser on a bunch of analogue captures. I open my MPEG2 files in VDub(Mod) and apply these filters:

- null transform/cropping
- resize to half D1
- deinterlace by fold-side-by-side
- denoise (neat)
- deinterlace by unfold
- resize to D1

Why do these filters produce a BFF video when the source is TFF ?????

Can I insert a field swap as the 1st filter to counter the unwanted field swap ?

Thanks,
Fudoh

[GodofaGap]

BFF/TFF is just a signal in the encoder, so you are probably not setting up whatever codec you use in the right way. (Many codecs assume bff by default)