doc/filters.texi: prefer @example over the unsupported @math for showing equation

23534d0c · Stefano Sabatini · 3fa9ace3 · 23534d0c
Commit 23534d0c authored Jan 24, 2012 by Stefano Sabatini
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filters.texi doc/filters.texi +3 -1

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--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -2342,7 +2342,9 @@ output video.

 This is done by changing the specified Sample (aka Pixel) Aspect
 Ratio, according to the following equation:
-@math{DAR = HORIZONTAL_RESOLUTION / VERTICAL_RESOLUTION * SAR}
+@example
+@var{DAR} = @var{HORIZONTAL_RESOLUTION} / @var{VERTICAL_RESOLUTION} * @var{SAR}
+@end example

 Keep in mind that the @code{setdar} filter does not modify the pixel
 dimensions of the video frame. Also the display aspect ratio set by