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| -rw-r--r-- | doc/filters.texi | 22 |
1 files changed, 21 insertions, 1 deletions
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: + +@table @samp +@item source_fps +The input's frame rate + +@item ntsc, qntsc, sntsc +NTSC frame rate of @code{30000/1001} + +@item pal, qpal, spal +PAL frame rate of @code{25.0} + +@item film +Film frame rate of @code{24.0} + +@item ntsc_film +NTSC-film frame rate of @code{24000/1001} +@end table + +The default is @code{25}. @item start_time Assume the first PTS should be the given value, in seconds. This allows for |