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doc/filters/aspect: update documentation

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Drop mention of unsupported N:M syntax, dropped since 0ed61546c459.

Also, drop reference of common expression constants, and fix
description of a expression parameter.

Fix issue:
http://trac.ffmpeg.org/ticket/9974
This commit is contained in:
Stefano Sabatini 2023-03-26 20:14:08 +02:00
parent 7d58df7bb2
commit 47c56ff554
1 changed files with 5 additions and 13 deletions
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18
doc/filters.texi
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@ -20888,12 +20888,9 @@ It accepts the following parameters:
@item r, ratio, dar (@code{setdar} only), sar (@code{setsar} only) @item r, ratio, dar (@code{setdar} only), sar (@code{setsar} only)
Set the aspect ratio used by the filter. Set the aspect ratio used by the filter.
The parameter can be a floating point number string, an expression, or The parameter can be a floating point number string, or an expression. If the
a string of the form @var{num}:@var{den}, where @var{num} and parameter is not specified, the value "0" is assumed, meaning that the same
@var{den} are the numerator and denominator of the aspect ratio. If input value is used.
the parameter is not specified, it is assumed the value "0".
In case the form "@var{num}:@var{den}" is used, the @code{:} character
should be escaped.
@item max @item max
Set the maximum integer value to use for expressing numerator and Set the maximum integer value to use for expressing numerator and
@ -20902,19 +20899,14 @@ Default value is @code{100}.
@end table @end table
The parameter @var{sar} is an expression containing The parameter @var{sar} is an expression containing the following constants:
the following constants:
@table @option @table @option
@item E, PI, PHI
These are approximated values for the mathematical constants e
(Euler's number), pi (Greek pi), and phi (the golden ratio).
@item w, h @item w, h
The input width and height. The input width and height.
@item a @item a
These are the same as @var{w} / @var{h}. Same as @var{w} / @var{h}.
@item sar @item sar
The input sample aspect ratio. The input sample aspect ratio.