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doc/filters: add geq diagonal split screen example

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Also remove similar but confusing and less useful example.

Based on geq expression by Patrick Race <raceink at gmail>.

Signed-off-by: Lou Logan <lou@lrcd.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Lou Logan 2016-02-11 15:44:40 -09:00
parent f0a8212436
commit 0b0121d7f2
1 changed files with 2 additions and 5 deletions
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doc/filters.texi
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@ -7478,12 +7478,9 @@ geq=lum=255*gauss((X/W-0.5)*3)*gauss((Y/H-0.5)*3)/gauss(0)/gauss(0),format=gray
@end example
@item
Create a linear gradient to use as a mask for another filter, then
compose with @ref{overlay}. In this example the video will gradually
become more blurry from the top to the bottom of the y-axis as defined
by the linear gradient:
Diagonal split screen to compare filter effect:
@example
ffmpeg -i input.mp4 -filter_complex "geq=lum=255*(Y/H),format=gray[grad];[0:v]boxblur=4[blur];[blur][grad]alphamerge[alpha];[0:v][alpha]overlay" output.mp4
ffmpeg -i input -filter_complex "[0:v]geq=lum=if(gt(X\,Y*(W/H))\,255),format=gray[alpha];[0:v][alpha]alphamerge,curves=preset=color_negative[filtered];[0:v][filtered]overlay" output
@end example
@end itemize