IVTC defaults in GK

[len0x]

I found this in the requests at SF:
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This IVTC default script works with some movies;
telecide()
decimate(5)

But typically get better results using;
telecide(guide=1)
decimate(5)

which works with almost every movie
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Can anybody comment on this ?

[N_F]

guide=1 is supposed to make telecide's fieldmatching better if the source is NTSC (guide=2 can be used for PAL). I don't have any personal experience with guide=1 since I rarely encode NTSC, but from what I've read guide=1 have helped in cases where guide=0 (default) have produced strange/bad results. And as I understand it, as long as the source is known to be NTSC with the usual 3:2 pattern it can't give worse results than guide=0.

Perhaps neuron2 will correct me if necesary or/and add something more?