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doc/filters: mention required compile options for some filters 

Signed-off-by: Lou Logan <lou@lrcd.com>
This commit is contained in:
Lou Logan 2018-06-04 16:38:20 -08:00
parent e7dda51150
commit 1f75756c71
1 changed files with 8 additions and 2 deletions
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doc/filters.texi
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@ -3893,6 +3893,9 @@ not meant to be used directly.
@section rubberband
Apply time-stretching and pitch-shifting with librubberband.
To enable compilation of this filter, you need to configure FFmpeg with
@code{--enable-librubberband}.
The filter accepts the following options:
@table @option
@ -11739,7 +11742,9 @@ Pass the video source unchanged to the output.
@section ocr
Optical Character Recognition
This filter uses Tesseract for optical character recognition.
This filter uses Tesseract for optical character recognition. To enable
compilation of this filter, you need to configure FFmpeg with
@code{--enable-libtesseract}.
It accepts the following options:
@ -17143,7 +17148,8 @@ zoompan=z='min(max(zoom,pzoom)+0.0015,1.5)':d=1:x='iw/2-(iw/zoom/2)':y='ih/2-(ih
@anchor{zscale}
@section zscale
Scale (resize) the input video, using the z.lib library:
https://github.com/sekrit-twc/zimg.
@url{https://github.com/sekrit-twc/zimg}. To enable compilation of this
filter, you need to configure FFmpeg with @code{--enable-libzimg}.
The zscale filter forces the output display aspect ratio to be the same
as the input, by changing the output sample aspect ratio.