X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=doc%2Ffilters.texi;h=93fdcec39fc2896d015505489211d412e2726a28;hb=77a72d348519584bac1499210619ea38adead130;hp=916655ab1a17734cf82d941fc752938371a5e775;hpb=faa1cb50ed7d2258932475ff571b7662f0089514;p=ffmpeg

diff --git a/doc/filters.texi b/doc/filters.texi
index 916655ab1a1..93fdcec39fc 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -2016,13 +2016,13 @@ drawtext="fontsize=60:fontfile=FreeSerif.ttf:fontcolor=green:text=g:x=(w-max_gly
 @item
 Show text for 1 second every 3 seconds:
 @example
-drawtext="fontfile=FreeSerif.ttf:fontcolor=white:x=100:y=x/dar:draw=lt(mod(t\\,3)\\,1):text='blink'"
+drawtext="fontfile=FreeSerif.ttf:fontcolor=white:x=100:y=x/dar:draw=lt(mod(t\,3)\,1):text='blink'"
 @end example
 
 @item
 Use fontconfig to set the font. Note that the colons need to be escaped.
 @example
-drawtext='fontfile=Linux Libertine O-40\\:style=Semibold:text=FFmpeg'
+drawtext='fontfile=Linux Libertine O-40\:style=Semibold:text=FFmpeg'
 @end example
 
 @end itemize
@@ -2186,6 +2186,9 @@ This filter accepts the following named parameters:
 @item fps
 Desired output framerate.
 
+@item round
+Rounding method. The default is @code{near}.
+
 @end table
 
 @section framestep
@@ -2823,7 +2826,7 @@ ffmpeg -i input -i logo1 -i logo2 -filter_complex
 
 # add a transparent color layer on top of the main video,
 # WxH specifies the size of the main input to the overlay filter
-color=red@.3:WxH [over]; [in][over] overlay [out]
+color=red@@.3:WxH [over]; [in][over] overlay [out]
 
 # play an original video and a filtered version (here with the deshake filter)
 # side by side
@@ -3250,16 +3253,34 @@ Keep in mind that the sample aspect ratio set by the @code{setsar}
 filter may be changed by later filters in the filterchain, e.g. if
 another "setsar" or a "setdar" filter is applied.
 
-The @code{setdar} and @code{setsar} filters accept a parameter string
-which represents the wanted aspect ratio.  The parameter can
-be a floating point number string, an expression, or a string of the form
-@var{num}:@var{den}, where @var{num} and @var{den} are the numerator
-and denominator of the aspect ratio. If the parameter is not
-specified, it is assumed the value "0:1".
+The @code{setdar} and @code{setsar} filters accept a string in the
+form @var{num}:@var{den} expressing an aspect ratio, or the following
+named options, expressed as a sequence of @var{key}=@var{value} pairs,
+separated by ":".
+
+@table @option
+@item max
+Set the maximum integer value to use for expressing numerator and
+denominator when reducing the expressed aspect ratio to a rational.
+Default value is @code{100}.
+
+@item r, ratio:
+Set the aspect ratio used by the filter.
+
+The parameter can be a floating point number string, an expression, or
+a string of the form @var{num}:@var{den}, where @var{num} and
+@var{den} are the numerator and denominator of the aspect ratio. If
+the parameter is not specified, it is assumed the value "0".
+In case the form "@var{num}:@var{den}" the @code{:} character should
+be escaped.
+@end table
+
+If the keys are omitted in the named options list, the specifed values
+are assumed to be @var{ratio} and @var{max} in that order.
 
 For example to change the display aspect ratio to 16:9, specify:
 @example
-setdar=16:9
+setdar='16:9'
 @end example
 
 The example above is equivalent to:
@@ -3269,7 +3290,13 @@ setdar=1.77777
 
 To change the sample aspect ratio to 10:11, specify:
 @example
-setsar=10:11
+setsar='10:11'
+@end example
+
+To set a display aspect ratio of 16:9, and specify a maximum integer value of
+1000 in the aspect ratio reduction, use the command:
+@example
+setdar=ratio='16:9':max=1000
 @end example
 
 @section setfield