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Diffstat (limited to 'doc/filters.texi')
| -rw-r--r-- | doc/filters.texi | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index 6f3994a204..7d4eeea26e 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -5722,6 +5722,44 @@ pad="2*iw:2*ih:ow-iw:oh-ih" @end example @end itemize +@section perspective + +Correct perspective of video not recorded perpendicular to the screen. + +A description of the accepted parameters follows. + +@table @option +@item x0 +@item y0 +@item x1 +@item y1 +@item x2 +@item y2 +@item x3 +@item y3 +Set coordinates expression for top left, top right, bottom left and bottom right corners. +Default values are @code{0:0:W:0:0:H:W:H} with which perspective will remain unchanged. + +The expressions can use the following variables: + +@table @option +@item W +@item H +the width and height of video frame. +@end table + +@item interpolation +Set interpolation for perspective correction. + +It accepts the following values: +@table @samp +@item linear +@item cubic +@end table + +Default value is @samp{linear}. +@end table + @section pixdesctest Pixel format descriptor test filter, mainly useful for internal |