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Diffstat (limited to 'doc/filters.texi')
| -rw-r--r-- | doc/filters.texi | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index 669a334eca..8f949221a8 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -386,6 +386,39 @@ fade=in:0:25, fade=out:975:25 fade=in:5:20 @end example +@section fieldorder + +Transform the field order of the input video. + +It accepts one parameter which specifies the required field order that +the input interlaced video will be transformed to. The parameter can +assume one of the following values: + +@table @option +@item 0 or bff +output bottom field first +@item 1 or tff +output top field first +@end table + +Default value is "tff". + +Transformation is achieved by shifting the picture content up or down +by one line, and filling the remaining line with appropriate picture content. +This method is consistent with most broadcast field order converters. + +If the input video is not flagged as being interlaced, or it is already +flagged as being of the required output field order then this filter does +not alter the incoming video. + +This filter is very useful when converting to or from PAL DV material, +which is bottom field first. + +For example: +@example +./ffmpeg -i in.vob -vf "fieldorder=bff" out.dv +@end example + @section fifo Buffer input images and send them when they are requested. |