> always gets it right). As a rule, stick to even numbers for the crop
> origin because of chroma subsampling and field interleaving.
Just even is not enough. Read here:
http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-dvd-mpeg4.html#menc-feat-dvd-mpeg4-constraints
There they say "for interlaced video, your y-offset and height for
cropping must be multiples of 4. "
From what I understand,
--
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