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doc/filters: mention obvious operation, for our always clueless users

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Paul B Mahol 2019-05-16 10:40:38 +02:00
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doc/filters.texi
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@ -18231,6 +18231,10 @@ implemented based on the de-interlace algorithm written by Jim
Easterbrook for BBC R&D, the Weston 3 field deinterlacing filter
uses filter coefficients calculated by BBC R&D.
This filter use field-dominance information in frame to decide which
of each pair of fields to place first in the output.
If it gets it wrong use @ref{setfield} filter before @code{w3fdif} filter.
There are two sets of filter coefficients, so called "simple":
and "complex". Which set of filter coefficients is used can
be set by passing an optional parameter: