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| author | Lou Logan <lou@lrcd.com> | 2018-06-04 16:38:20 -0800 |
|---|---|---|
| committer | Lou Logan <lou@lrcd.com> | 2018-06-04 16:46:05 -0800 |
| commit | 1f75756c719442280590b97bf17f3eed7d6aa93d (patch) | |
| tree | bb7cafd1ac4aae8e930b3b8a023349e7ba4ef303 /doc | |
| parent | e7dda51150b73e5fbdccf4c2d3a72e356980fba3 (diff) | |
| download | ffmpeg-1f75756c719442280590b97bf17f3eed7d6aa93d.tar.gz | |
doc/filters: mention required compile options for some filters
Signed-off-by: Lou Logan <lou@lrcd.com>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/filters.texi | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index 9f8fb74090..256ab42b00 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -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. |