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author | Rudolf Polzer <divVerent@xonotic.org> | 2013-11-02 11:57:24 +0100 |
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committer | Anton Khirnov <anton@khirnov.net> | 2013-11-02 21:14:08 +0100 |
commit | 34a0ac41a880039c7fb4b3abce10d8e2ce48fac7 (patch) | |
tree | 559b7c99123b2d0bc7b079d9a5252ba040004a35 /doc/filters.texi | |
parent | 5928b29f53997f05d01330d05f4f51a850831855 (diff) | |
download | ffmpeg-streaming-34a0ac41a880039c7fb4b3abce10d8e2ce48fac7.zip ffmpeg-streaming-34a0ac41a880039c7fb4b3abce10d8e2ce48fac7.tar.gz |
vf_aspect: support variables in evaluating the aspect ratios
Example: -vf setsar=sar="sar*9/10"
Signed-off-by: Rudolf Polzer <divverent@xonotic.org>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
Diffstat (limited to 'doc/filters.texi')
-rw-r--r-- | doc/filters.texi | 54 |
1 files changed, 52 insertions, 2 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index e4fb57e..afb48b1 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -2049,10 +2049,35 @@ This filter accepts the following options: @table @option @item dar -Output display aspect ratio, as a rational or a decimal number. +Output display aspect ratio. @end table +The parameter @var{dar} is an expression containing +the following constants: + +@table @option +@item E, PI, PHI +the corresponding mathematical approximated values for e +(euler number), pi (greek PI), phi (golden ratio) + +@item w, h +the input width and height + +@item a +same as @var{w} / @var{h} + +@item sar +input sample aspect ratio + +@item dar +input display aspect ratio, it is the same as (@var{w} / @var{h}) * @var{sar} + +@item hsub, vsub +horizontal and vertical chroma subsample values. For example for the +pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1. +@end table + For example to change the display aspect ratio to 16:9, specify: @example setdar=dar=16/9 @@ -2158,10 +2183,35 @@ This filter accepts the following options: @table @option @item sar -Output sample aspect ratio, as a rational or decimal number. +Output sample aspect ratio. @end table +The parameter @var{sar} is an expression containing +the following constants: + +@table @option +@item E, PI, PHI +the corresponding mathematical approximated values for e +(euler number), pi (greek PI), phi (golden ratio) + +@item w, h +the input width and height + +@item a +same as @var{w} / @var{h} + +@item sar +input sample aspect ratio + +@item dar +input display aspect ratio, it is the same as (@var{w} / @var{h}) * @var{sar} + +@item hsub, vsub +horizontal and vertical chroma subsample values. For example for the +pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1. +@end table + For example to change the sample aspect ratio to 10:11, specify: @example setsar=sar=10/11 |