[FFmpeg-cvslog] doc/filters: document expr support in fps filter

[Gyan Doshi]

ffmpeg | branch: master | Gyan Doshi <ffmpeg at gyani.pro> | Wed Jun 16 16:00:15 2021 +0530| [604924a069735f3f1fd56b5dd125e68d402f15ba] | committer: Gyan Doshi

doc/filters: document expr support in fps filter

Added in dd770883e976c91feeb8de58eacd97dfb4e8308e

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=604924a069735f3f1fd56b5dd125e68d402f15ba
---

 doc/filters.texi | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/doc/filters.texi b/doc/filters.texi
index 78faf767cf..da8f7d7726 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -12334,7 +12334,27 @@ It accepts the following parameters:
 @table @option
 
 @item fps
-The desired output frame rate. The default is @code{25}.
+The desired output frame rate. It accepts expressions containing the following
+constants:
+
+ at table @samp
+ at item source_fps
+The input's frame rate
+
+ at item ntsc, qntsc, sntsc
+NTSC frame rate of @code{30000/1001}
+
+ at item pal, qpal, spal
+PAL frame rate of @code{25.0}
+
+ at item film
+Film frame rate of @code{24.0}
+
+ at item ntsc_film
+NTSC-film frame rate of @code{24000/1001}
+ at end table
+
+The default is @code{25}.
 
 @item start_time
 Assume the first PTS should be the given value, in seconds. This allows for