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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/filters.texi | 55 |
1 files changed, 50 insertions, 5 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index 34212b513d..839a1c6a9f 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -15997,10 +15997,31 @@ in source frames. @table @option @item w @item h -Set the output video dimension expression. Default value is the input dimension. +Set the output video dimension expression. Default values are @code{iw} and +@code{ih}. Allows for the same expressions as the @ref{scale} filter. +@item crop_x +@item crop_y +Set the input crop x/y expressions, default values are @code{(iw-cw)/2} and +@code{(ih-ch)/2}. + +@item crop_w +@item crop_h +Set the input crop width/height expressions, default values are @code{iw} and +@code{ih}. + +@item pos_x +@item pos_y +Set the output placement x/y expressions, default values are @code{(ow-pw)/2} +and @code{(oh-ph)/2}. + +@item pos_w +@item pos_h +Set the output placement width/height expressions, default values are @code{ow} +and @code{oh}. + @item format Set the output format override. If unset (the default), frames will be output in the same format as the respective input frames. Otherwise, format conversion @@ -16012,9 +16033,9 @@ Work the same as the identical @ref{scale} filter options. @item normalize_sar If enabled, output frames will always have a pixel aspect ratio of 1:1. This -will introduce padding/cropping as necessary. If disabled (the default), any -aspect ratio mismatches, including those from e.g. anamorphic video sources, -are forwarded to the output pixel aspect ratio. +will introduce additional padding/cropping as necessary. If disabled (the +default), any aspect ratio mismatches, including those from e.g. anamorphic +video sources, are forwarded to the output pixel aspect ratio. @item pad_crop_ratio Specifies a ratio (between @code{0.0} and @code{1.0}) between padding and @@ -16026,7 +16047,7 @@ approaches. @item fillcolor Set the color used to fill the output area not covered by the output image, for -example as a result of @ref{normalize_sar}. For the general syntax of this +example as a result of @option{normalize_sar}. For the general syntax of this option, check the @ref{color syntax,,"Color" section in the ffmpeg-utils manual,ffmpeg-utils}. Defaults to @code{black}. @@ -16051,6 +16072,30 @@ BT.2020+PQ, overriding the usual input frame metadata. These will also be picked as the values of @code{auto} for the respective frame output options. @end table +In addition to the expression constants documented for the @ref{scale} filter, +the @option{crop_w}, @option{crop_h}, @option{crop_x}, @option{crop_y}, +@option{pos_w}, @option{pos_h}, @option{pos_x} and @option{pos_y} options can +also contain the following constants: + +@table @option +@item crop_w, cw +@item crop_h, ch +The computed values of @option{crop_w} and @option{crop_h}. + +@item pos_w, pw +@item pos_h, ph +The computed values of @option{pos_w} and @option{pos_h}. + +@item in_t, t +The input frame timestamp, in seconds. NAN if input timestamp is unknown. + +@item out_t, ot +The input frame timestamp, in seconds. NAN if input timestamp is unknown. + +@item n +The input frame number, starting with 0. +@end table + @subsubsection Scaling The options in this section control how libplacebo performs upscaling and (if necessary) downscaling. Note that libplacebo will always internally operate on |