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doc/filters/perlin: specify default values

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Stefano Sabatini 2024-07-06 14:10:49 +02:00
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doc/filters.texi
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@ -29306,28 +29306,30 @@ due to boulders in a generated terrain).
Specify the size (width and height) of the buffered video frames. For the
syntax of this option, check the
@ref{video size syntax,,"Video size" section in the ffmpeg-utils manual,ffmpeg-utils}.
Default value is @code{320x240}.
@item rate, r
Specify the frame rate expected for the video stream, expressed as a
number of frames per second.
number of frames per second. Default value is @code{25}.
@item octaves
Specify the total number of components making up the noise, each one
with doubled frequency.
with doubled frequency. Default value is @code{1}.
@item persistence
Set the ratio used to compute the amplitude of the next octave
component with respect to the previous component amplitude.
component with respect to the previous component amplitude. Default
value is @code{1}.
@item xscale
@item yscale
Define a scale factor used to multiple the x, y coordinates. This can
be useful to define an effect with a pattern stretched along the x or
y axis.
y axis. Default value is @code{1}.
@item tscale
Define a scale factor used to multiple the time coordinate. This can
be useful to change the time variation speed.
be useful to change the time variation speed. Default value is @code{1}.
@item random_mode
Set random mode used to compute initial pattern.
@ -29346,9 +29348,11 @@ sources.
Use the value specified by @option{random_seed} option.
@end table
Default value is @code{random}.
@item random_seed, seed
When @option{random_mode} is set to @var{random_seed}, use this value
to compute the initial pattern.
to compute the initial pattern. Default value is @code{0}.
@end table
@subsection Examples