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> Each frame consists of two interlaced fields: first the odd-numbered lines and then the even-numbered ones

Not always. Most† interlaced video is indeed upper/top-field-first, but some is lower/bottom-field-first! DV, for example, is usually BFF.

It gets even more complicated with modern GOP codecs that can also be PAFF or MBAFF.

[†] Source: Experience — I encode a lot of SD video.