New Decomb plugin and field order

[lpn1160]

Not sure if this is the place for this post!!

I have been using the new decomb plugin V5 for avisynth. Have noticed something weird. Last week all my captures (capping from digital cable box, s-video)were BFF, using the method of checking: AssumeBFF().SeparateFields().
This week however all my caps are TFF. What gives, just curious what determines field order, capture card (WinTV PCI PVR)in my case, the broadcast channel???
Of course the plugin does it's job well when I specify the correct order:
Telecide(order=0,post=0,guide=1)#or the other way around order=1
Decimate(cycle=5)
capping to virtualdub @ 480x480 with mjpeg @full 20
using avisynths latest version 2.52
Any thoughts or know whys of this, not that it's a problem, just curious. Thanxs in advance

[Guest]

The field order is fixed in the analog SVideo signal. Therefore, your
capture card/codec is making the decision about how to assemble frames from fields. Did you use a different codec during capture?

[lpn1160]

I almost always use picvideo mjpeg, usually just adjusting the lumna and chroma slightly depending on how long the capture is and how much disk space is left on my capture partition (63 Gigs). I never go higher than a setting of 2c hroma & 2 lumna.
But now at least I know "what determines field order"

Thanks for the reply