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diff --git a/doc/filters.texi b/doc/filters.texi index f456d03617..3e37b5302d 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -3423,6 +3423,174 @@ format=monow, pixdesctest can be used to test the monowhite pixel format descriptor definition. +@section pp + +Enable the specified chain of postprocessing subfilters using libpostproc. This +library should be automatically selected with a GPL build (@code{--enable-gpl}). +Subfilters must be separated by '/' and can be disabled by prepending a '-'. +Each subfilter and some options have a short and a long name that can be used +interchangeably, i.e. dr/dering are the same. + +All subfilters share common options to determine their scope: + +@table @option +@item a/autoq +Honor the quality commands for this subfilter. + +@item c/chrom +Do chrominance filtering, too (default). + +@item y/nochrom +Do luminance filtering only (no chrominance). + +@item n/noluma +Do chrominance filtering only (no luminance). +@end table + +These options can be appended after the subfilter name, separated by a ':'. + +Available subfilters are: + +@table @option +@item hb/hdeblock[:difference[:flatness]] +Horizontal deblocking filter +@table @option +@item difference +Difference factor where higher values mean more deblocking (default: @code{32}). +@item flatness +Flatness threshold where lower values mean more deblocking (default: @code{39}). +@end table + +@item vb/vdeblock[:difference[:flatness]] +Vertical deblocking filter +@table @option +@item difference +Difference factor where higher values mean more deblocking (default: @code{32}). +@item flatness +Flatness threshold where lower values mean more deblocking (default: @code{39}). +@end table + +@item ha/hadeblock[:difference[:flatness]] +Accurate horizontal deblocking filter +@table @option +@item difference +Difference factor where higher values mean more deblocking (default: @code{32}). +@item flatness +Flatness threshold where lower values mean more deblocking (default: @code{39}). +@end table + +@item va/vadeblock[:difference[:flatness]] +Accurate vertical deblocking filter +@table @option +@item difference +Difference factor where higher values mean more deblocking (default: @code{32}). +@item flatness +Flatness threshold where lower values mean more deblocking (default: @code{39}). +@end table +@end table + +The horizontal and vertical deblocking filters share the difference and +flatness values so you cannot set different horizontal and vertical +thresholds. + +@table @option +@item h1/x1hdeblock +Experimental horizontal deblocking filter + +@item v1/x1vdeblock +Experimental vertical deblocking filter + +@item dr/dering +Deringing filter + +@item tn/tmpnoise[:threshold1[:threshold2[:threshold3]]], temporal noise reducer +@table @option +@item threshold1 +larger -> stronger filtering +@item threshold2 +larger -> stronger filtering +@item threshold3 +larger -> stronger filtering +@end table + +@item al/autolevels[:f/fullyrange], automatic brightness / contrast correction +@table @option +@item f/fullyrange +Stretch luminance to @code{0-255}. +@end table + +@item lb/linblenddeint +Linear blend deinterlacing filter that deinterlaces the given block by +filtering all lines with a @code{(1 2 1)} filter. + +@item li/linipoldeint +Linear interpolating deinterlacing filter that deinterlaces the given block by +linearly interpolating every second line. + +@item ci/cubicipoldeint +Cubic interpolating deinterlacing filter deinterlaces the given block by +cubically interpolating every second line. + +@item md/mediandeint +Median deinterlacing filter that deinterlaces the given block by applying a +median filter to every second line. + +@item fd/ffmpegdeint +FFmpeg deinterlacing filter that deinterlaces the given block by filtering every +second line with a @code{(-1 4 2 4 -1)} filter. + +@item l5/lowpass5 +Vertically applied FIR lowpass deinterlacing filter that deinterlaces the given +block by filtering all lines with a @code{(-1 2 6 2 -1)} filter. + +@item fq/forceQuant[:quantizer] +Overrides the quantizer table from the input with the constant quantizer you +specify. +@table @option +@item quantizer +Quantizer to use +@end table + +@item de/default +Default pp filter combination (@code{hb:a,vb:a,dr:a}) + +@item fa/fast +Fast pp filter combination (@code{h1:a,v1:a,dr:a}) + +@item ac +High quality pp filter combination (@code{ha:a:128:7,va:a,dr:a}) +@end table + +@subsection Examples + +@itemize +@item +Apply horizontal and vertical deblocking, deringing and automatic +brightness/contrast: +@example +pp=hb/vb/dr/al +@end example + +@item +Apply default filters without brightness/contrast correction: +@example +pp=de/-al +@end example + +@item +Apply default filters and temporal denoiser: +@example +pp=default/tmpnoise:1:2:3 +@end example + +@item +Apply deblocking on luminance only, and switch vertical deblocking on or off +automatically depending on available CPU time: +@example +pp=hb:y/vb:a +@end example +@end itemize + @section removelogo Suppress a TV station logo, using an image file to determine which |