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doc: Explain how to use the fps and the fieldmatch filter together.

Fixes ticket #3968.
tags/n2.8
Carl Eugen Hoyos 9 years ago
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doc/filters.texi View File

@@ -5483,8 +5483,9 @@ which @code{fieldmatch} is based on. While the semantic and usage are very
close, some behaviour and options names can differ.

The @ref{decimate} filter currently only works for constant frame rate input.
Do not use @code{fieldmatch} and @ref{decimate} if your input has mixed
telecined and progressive content with changing framerate.
If your input has mixed telecined (30fps) and progressive content with a lower
framerate like 24fps use the following filterchain to produce the necessary cfr
stream: @code{dejudder,fps=30000/1001,fieldmatch,decimate}.

The filter accepts the following options:



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