The FXScript Reference

For Final Cut Pro created by Joe Maller

fieldNumber

fieldNumber

FieldNumber returns a 1 or 2 depending on which sequential field is currently visible. As far as I've been able to tell, the fields are reported in temporal order, regardless of the source clip's field order.

FieldNumber and fieldprocessing, were introduced in Final Cut Pro 3, and together bring useful field identification shortcuts to the FXScript Language.

This value is equal to (frame mod 2) + 1, which was a quick way of detecting which frame was visible before FCP 3.

Additional Notes

Progressive Clips fieldNumber = 1

Progressive clips (non-interlaced) return a fieldNumber of 1.