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doc/filters: document expr support in fps filter

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Added in dd770883e976c91feeb8de58eacd97dfb4e8308e
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Gyan Doshi 2021-06-16 15:42:15 +05:30
parent fcb80aa289
commit 604924a069
1 changed files with 21 additions and 1 deletions
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doc/filters.texi
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@ -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